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STRENGTH OF MATERIALS

1100. Strain is defined as the ratio of

a. change in volume to original volumeb. change in length to original lengthc. change in cross-sectional area to original

cross sectional aread. any one of the abovee. none of the above

1101. Hooke's law holds good uptoa. yield point b. limit proportionalityc. breaking point d. elastic limite. plastic limit

1102. Young's modulus is defined as the ratio of

a. volumetric stress and volumetric strainb. lateral stress and lateral strainc. longitudinal stress and longitudinal straind. shear stress to shear straine. longitudinal stress and lateral strain

1103. Deformation per unit length in the directionof force is known asa. strain b. lateral strainc. linear strain d. linear stresse. unit strain

1104. If equal and opposite forces applied to a

body tend to elongate it, the stress so producedis calleda. internal resistance b. tensile stressc. transverse stress d. compressive stresse. working stress

1105. Module of rigidity is defined as the ratio of a. longitudinal stress and longitudinal strainb. volumetric stress and volumetric strainc. lateral stress and lateral straind. shear stress and straine. linear stress and lateral strain

1106. Tensile strength of a material is obtained bydividing the maximum load during the test bythea. area at time of fractureb. original cross sectional areac. average of (a) and (b)d. minimum area after fracturee. none of the above

1107. The impact strength of a material is an indexof a. toughness b. tensile strengthc. capability of being cold workedd. hardness e. fatigue strength

1108. The intensity of stress which causes unitstrain are called

a. unit stressb. bulk modulusc. modulus of rigidityd. modulus of elasticitye. principal stress

1109. The buckling load for a given materialdepends ona. slenderness ratio and area of cross sectionb. Poison's ratio and modulus of elasticityc. Slenderness ratio, ratio area of cross section

and modulus of elasticityd. Poison's ratio and Slenderness ratio

1110. The property of a material by virtue of whicha body returns to its original shape afterremoval of load is calleda. plasticity b. elasticityc. ductility d. malleablee. resilience

1111. The property of a material which allows it tobe drawn into a smaller section is calleda. plasticity b. ductilityc. elasticity d. malleabilitye. drawability

1112. Poison's ratio is defined as the ratio of a. longitudinal stress and longitudinal strainb. longitudinal stress and lateral stressc. lateral stress and longitudinal stressd. all of the abovee. none of the above

1113. The property of a material by virtue of whichit can be beaten or rolled into plates in calleda. malleability b. ductilityc. plasticity d. elasticitye. reliability

1114. If a material expands freely due to heating itwill developa. thermal stresses b. tensile stressc. bending d. compressive stresse. no stress

1115. The stress developed in a material atbreaking point in extension is calleda. breaking stress b. fracture stressc. yield point stress d. ultimate tensile stresse. proof stress

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1116. When it is indicated that a member iselastic, it means that when force is applied, itwill

a. not deform b. be safestc. stretch d. no stretche. none of the above

1117. The distance between the centres of twoconsecutive rivets in the same row is calleda. lead b. lapc. pitch d. spacinge. clearance

1118. The distance between the centres of therivets in adjacent rows of zig zag riveted joint isknown asa. pitch b. back pitchc. diagonal pitch d. diametral pitche. lap

1119. When two plates are put together andriveted with cover plates with two rows of rivets,the joint is known asa. lap jointb. butt jointc. single riveted single cover butt jointd. double riveted double cover butt jointe. single riveted double cover butt joint

1120. Increase in number of rows of rivets results

ina. decrease in efficiency of jointb. increase in efficiency of jointc. no change in efficiency of jointd. increase/decrease of efficiency of joint

dependente. none of the above

1121.A riveted joint in which every rivet of a row isopposite to other rivet of the outer row, isknown asa. chain riveted jointb. diamond riveted joint

c. cris-cross riveted jointd. zig-zag riveted jointe. none of the above

1122. The diameter of rivets in mm for a plate of thickness ̀ t' mm taken asa. 5 b. 2tc. t d. 1.41vte. 6.05vt

1123. A riveted joint in which spacing of the rivetsis staggered in such a way that over rivet is in

the middle of the two rivets of the opposite rowis known asa. zig-zag riveted joint

b. diamond riveted jointc. butt riveted jointd. chain riveted jointe. criss-cross riveted joint

1124. The weakest section of a diamond riveting isthe section which passes througha. the first rowb. the second rowc. the central rowd. the rivet hole of the end rowe. none of the above

1125. If b is the width of a plate joined by diamondriveting of diameter (d) the efficiency of the

joint is given bya. b+d/b b. b-d/bc. d-b/d d. b-d/de. b/b-d

1126.A beam of length l, having uniform load of wkg per unit length, is supported freely at theends. The moments at mid span will bea. wl/4 b. wl2/2c. wl2/4 d. wl2/8e. none of the above

1127. Twisting couple in a shaft introduces in ita. bending moment b. deflectionc. shear strain d. stresse. shear stress

1128. A boiler shell 200 cm dia plate thickness 1.5cm is subjected to internal pressure of 1.5MN/m2, then the hoop stress will bea. 30 N/m2 b. 50 N/m2c. 100 /m2 d. 200 N/m2e. 300 N/m2

1129. Longitudinal stress in a thin cylinder is

a. equal to the hoop stressb. twice the hoop stressc. half of the hoop stressd. one-fourth of hoop stresse. fourtimes the hoop stress

1130. The radius taken into consideration incalculating the stress in a hollow shaftsubjected to torsion isa. inner radiusb. outer radiusc. mean radiusd. both inner and outer radii

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e. geometric mean of inner and outer radii

1131. The torsional rigidity of a shaft is expressed

by thea. maximum torque it can transmitb. number of cycles it undergoes before failurec. elastic limit upto which it resists torsion,

shear and bending stressesd. torque required to produce a twist of one

radian per unit length of shafte. maximum power it can transmit at highest

possible speed

1132. At the principle planesa. the normal stress is maximum or minimum

and shear stress is zerob. the tensile and compressive stresses are

zeroc. the normal stress is zero and the shear stress

is maximumd. no stress actse. all the stresses are maximum

1133. The longitudinal stress induced in a thinwalled cylindrical vessel isa. pD/2t b. pD/4tc. pD/t d. pD/3te. pD/6t

1134. The circumferential stress induced in a thin-

walled cylindrical vessel isa. pD/2t b. pD/4tc. pD/t d. pD/3te. pD/6t

1135. A cylindrical steel bar of L meters deformsby 1 cm. The strain in bar isa. 1/L b. 0.1/Lc. 0.01/L d. 100/Le. none of the above

1136. A cylindrical steel bar having length of 0.25m is subjected to a tensile force of 2000 kg. If stress and total elongation are not exceed 1000

kg/cm2 and 0.01 cm respectively and E = 2 x106 kg/cm2, then its cross-sectional areashould bea. 2 cm2 b. 2.5 cm2c. 2.5 cm2 d.5 cm2e. unpredictable

1137. A structural member subjected to an axialcompressive force is calleda. beam b. columnc. frame d. strute. structure

1138. Compare the strengths of solid and hollowshafts both having diameter outside D andhollow shaft having inside diameter of D/2 in

torsion. The ratio of strength of solid to hollowshafts in torsion will bea. 0.5 b. 0.75c. 15/16 d. 1/16e. 0.25

1139. 100 KW is to be transmitted by each of twoseparate shafts. A is turning at 250 rpm and Bat 300 rpm. Which shaft must have greaterdiametera. Ab. Bc. both will have samed. unpredictable diametere. none of the above

1140. Torsional rigidity of a solid circular shaft of diameter `d' is proportional toa. d b. d2c. 1/d2 d. d4e. 1/d4

1141. The elongation of a close coiled helicalspring subjected to tensile load is proportionaltoa. mean diameter of springb. reciprocal of length of spring

c. diameter of wire of coild. shear modulus of the material of springe. reciprocal of mean diameter of spring

1142. The reactions at each support of beam canbe determined from following condition of equilibriuma. algebraic sum of all vertical forces is zerob. algebraic sum of all horizontal forces is zeroc. algebraic sum of moments about any point is

zerod. all of the abovee. none of the above

1143. Bending moment at any point is equal toalgebraic sum of a. all vertical forcesb. all horizontal forcesc. forces on either side of the pointd. moments of forces on either side of the pointe. all of the above

1144. The bulk modulus of a material is defined asthe ratio of a. volume change to modulus of elasticityb. stress intensity to volumetric strain

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c. volume change to original volumed. pressure applied to change in the volumee. volumetric strain to the stress intensity

1145. The bending moment on a section ismaximum where shearing forcea. is maximum b. is minimumc. is equal d. changes signe. is zero

1146. A beam is said to be uniform strength, if a. B.M is same throughout the beamb. shear stress is same throughout the beamc. deflection is same throughout the beamd. bending stress is same at every section

along its longitudinal axise. none of the above

1147. Two beams have same width but one beamhas double the depth of the other. The elasticstrength of double depth beam compared toother beam will bea. double b. four timesc. six times d. eight timese. none of the above

1148. Two beams have same depth but one beamhas double the width of the other. The elasticstrength of double width beam compared toother beam will be

a. sameb. doublec. three timesd. four timese. none of the above

1149. Two beams have same width and depth. The span of one is twice the span of other. Theelastic strength of longer span beam comparedto other beam will bea. same b. half c. double d. one-fourthe. none of the above

1150. If a shaft of radius r and polar moment of inertia J be subjected to bending moment Mand torque T, then maximum combined shearstress is equal toa. r/j(M2+T2) b. j/r(M2+T2)c. 2r/j(M2+T2) d. r/j(M/2+M2 T2)e. r/j[(M2+T2)/2]

1151. A cantilever beam is deflected by a due toload P. If load is doubled then deflection

compared to earlier case will be changed by afactor of a. 2 b. 1/2

c. 1/8 d. 8e. 4

1152. A cantilever beam is deflected by D due toload P. If beam width is doubled, thendeflection compared to earlier case will bechanged by a factora. 2 b. 1/2c. 1/8 d. 8e. 4

1153. In a filliot weld, the maximum load that canbe applied is equal toa. permissible shearing stress(S

s) fillet size

fillet length(L)b. 0.707 (Ss) fillet size Lc. (Ss fillet size L)2d. S Ss fillet size Le. none of the above

1154. The equivalent length of a column supportedfirmly at both ends isa. 0.1 b. 0.71c. 0.51 d. 1e. none of the above

1155. The equivalent length of a column supportedfirmly at one-end and free at other end isa. 21 b. 0.71c. 1 d. 0.51e. none of the above

1156. When the diameter of a shaft is doubled, itsflexural rigidity is increaseda. twice b. four timesc. eight times d. sixteen times

1157. Maximum deflection in a beam supportedfreely at both ends due to a central load P atmiddle isa. Pl3/48El b. pl3/32Elc. pl3/96El d. pl3/64Ele. pl3/128El

1158. Maximum deflection in a cantilever beam of length ̀ l' carrying a load ̀P' at its end will bea. pl3/3El b. pl3/8Elc. pl3/32El d. pl3/64Ele. pl3/128El

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1159. Maximum deflection case of a cantileverbeam carrying uniformly distributed load w perunit length will be

a. wl

4

/El b. wl

4

/8Elc. wl4/4El d. (5/64)+(wl4/El)e. (5/384)/(wl4/El)

1160. The ratio of central deflection due to acentral load in the case of a beam freelysupported at both ends to the beam fixed atboth ends will bea. 1/2 b. 2c. 1/4 d. 4e. none of the above

1161. For a simply supported beam having load atthe centre the bending moment will bea. minimum at supportb. minimum at the centrec. maximum at the supportd. minimum and maximum could be any where,

along the lengthe. none of the above

1162. A long column fails bya. crushing b. tensionc. shearing d. buckling

e. buckling and crushing

1163. The value of M.I for a solid shaft of diameter`d' is equal toa. d2/32 b. d2/64c. d4/16 d. d3/32e. d3/16

1164. Torque in a solid shaft of diameter `d' andshear strength of Ss is given bya. /8 Ssd

3 b. /16 Ssd3

c. /32 Ssd3 d. /64 Ssd

3 e. /16 Ssd4

APPLIED MECHANICS

1165. If three vectors are such that three sides of atriangle taken in order, then their resultant isa. 3 side of the triangle

b. 0c. area of the triangled. none of the above

1166. The time taken to reach the maximumheight for a body, projected vertically upwardsis, (initial velocity-U) height `H',a. U/g b. 2U/gc. v2gh d. none of the above

1167. The greatest height reached by a projectile,with velocity of projection, u & angle of projection is

a. (USin)/g b. (2U Sin)/gc. (U2 Sin2)/2g d. (U2 Sin2)/g

1168. The Trajectory of a projectile isa. hyperbola b. semiellipsec. parabola d. sine curve

1169. The magnitude of centripetal acceleration isa. U2/r b. U2/2c. IW d. 2N

1170. The relation between frinctional angle &frinctionala. =tan

b. =Sin c. =cos d. =/4+, in radians

1171. The period time of conical pendulum is,a. 2h/g b. mw2lc. 1 d. none of the above

1172. A particle of mass m slides from rest fromthe maximum point on the outside of a sphereof radius ̀ r'. As it slides down, at one point it willleave the surface of the sphere. At that point,its height from the ground isa. 2/3r b. 5/3rc. (r2+2g) d. (2r/mg)

1173. The value of gravitational constant is

a. 7.3 10-8 b. 6.67 10-11N.m2/kg2 c. 9.31 m/s2 d. 13.38 10-23kgf.m2/kg2

1174. The value of `g' at a height equal to theradius of the earth from the ground isa. 1/8 times g value on the surface of the earthb. 1/3 times g value on the surface of the earthc. 2 times g value on the surface of the earthd. 1/4 times g value on the surface of the earthe. can't be determined with the given data

1175. The escape velocity of a body is

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a. constantb. proportional to its massc. proportional to its

d. none of the above distance from the centreof earth

1176. Bulk modulus is defined asa. P/(V/V) b. P/(V/P)c. (V/V)/P d. (V/P)/P

1177. Reciprocal of bulk modulus is calleda. Poison's constantb. Elastic constantc. Co-efficient of restitutiond. none of the above

1178. If three non-parallel forces acting upon abody produce equilibrium, thena. their points of action should be collinearb. F1

2 +F22 +F2

2 = 0c. F1F2 =F2F3 =F1F3 =constantd. their lines of action should be concurrent

1179. `Baking' in mechanics meansa. negotiating a curved trackb. giving a slope for the road dependingc. designing the wings of the aeroplaned. measuring the air resistance

1180. A conical pendulum is

a. same as simple pendulumb. same as compound pendulumc. same as simple harmonicd. none of the above motion

1181. Turbo jets require very long run waysbecause they want, ram air pressure at theirinleta. to pick up speedb. to steadyc. none of the above

1182. The co-efficient of elasticity between twoload balls of each 0.25 kgs is 0.2 the samebetween two lead balls of each 0.5 kgs is

a. 0.4b. 0.1c. depends upon the radiusd. none of the above

1183. Angular momentum isa. momentum angle of rotation, in radiansb. momentum tan (angle of rotation)c. momentum accelerationd. torquee. none of the above

1184. 1 Faraday is

a. 96.5 coulombs b. 96500 coulombsc. 10650 coulombs d. none of the above

1185. Virtual work is thea. work that is done by virtual forceb. work that should have been done by a forcec. work that will be done, in the absence of

frictiond. none of the above

1186. The following turbine can be used as aturbine and as well as a pumpa. Pelton wheel b. Francis turbinec. Kaplan turbine d. De-Laval turbine

1187. The strongest joint of the following isa. riveted joint b. welded jointc. threaded joint d. knuckle joint

1188. Soderberg line is related toa. refrigeration & air conditioningb. cooling curve for alloysc. pressure variation with height in the

atmosphered. fluctuating stresses

MACHINE DESIGN

1189. The ultimate strength of steel in tension incomparison to shear is in their ratio of a. 1 : 1 b. 2 : 1c. 3 : 2 d. 1 : 2e. 1 : 2

1190. For a long and narrow cross section (i.e.ratio of b/t breadth `b' and thickness t̀' above10) bar subjected to torsion T, the value of maximum shear stress will bea. T/bt2 b. T/2bt2

c. 2T/bt2 d. 3T/bt2 e. T/2bt

1191. For a rectangular cross-section beamsubjected to a shearing force F, the maximumshearing stress induced will bea. F/bt b. 2F/btc. 3F/2bt d. F/2bte. none of the above

1192. Stress concentration is caused due to

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a. variation in properties of material from pointto point in a member

b. pitting at points or areas at which loads on a

member are appliedc. abrupt change of sectiond. all of the abovee. none of the above

1193. Endurance limit or fatigue limit is themaximum stress thata member can withstand for a infinite number of

load applications without failure whensubjected to a. dynamic loading

b. static loadingc. combined static and dynamic loadingd. completely reversed loadinge. all of the above

1194. The fatigue limit of a materiala. is greatly decreased by poor surface

conditionsb. remains same irrespective of surface

conditionsc. depends mainly on core compositiond. is dependent upon yield strength of materiale. none of the above

1195. Cold workinga. increases the fatigue strengthb. decreases the fatigue strength

c. has no influence on fatigue strengthd. alone has no influence on fatigue strengthe. none of the above

1196. Resistance to fatigue of a material ismeasured bya. young's modulusb. coefficient of elasticityc. elastic limitd. ultimate tensile strengthe. endurance limit

1197. The deflection of a cantilever beam under

load W is . If its width is halved, then thedeflection under load W will bea. 2 b. /2c. 4 d. /4e. none of the above

1198. The designation M 33 x 2 of a bolt meansa. metric threads of 33 nos. in 2 cmb. metric threads of with cross section of 33 cm2 c. metric threads of 33 mm outside diameter

and 2 mm pitchd. bolt of 33 mm nominal diameter having 2

threads per cm

e. none of the above

1199. Which of the following acts as a permanent

fasteninga. bolts and nuts b. keysc. cotters d. rivetse. screws

1200. If threads on a bolt are left hand, threads onnut will bea. right hand with same pitchb. left hand with same pitchc. could be left or right handd. right hand with fine pitche. left hand with fine pitch

1201. Taper on the cotter and slot is provideda. on both the sidesb. on one side onlyc. on none of the sidesd. may be provided anywheree. none of the above

1202. The edges of the plates for cylindricalvessels are usually beveled to an angle of 80 fora. reducing stress concentrationb. ease of manufacturec. safetyd. fullering and caulkinge. all of the above

1203. Spring index is `C'a. ratio of coil diameter to wire diameterb. load required to produce unit deflectionc. its capability of storing energyd. indication of quality of springe. none of the above

1204. Spring stiffness isa. ratio of coil diameter to wire diameterb. load required to produce unit deflectionc. its capability of storing energy

d. its ability to absorb shockse. none of the above

1205. When two springs are in series (havingstiffness K), the equivalent stiffness will bea. K b. K/2c. 2K d. K/4e. 1/K

1206. If two springs are in parallel then theiroverall stiffness will bea. half b. samec. double d. unpredictable

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1207. In hydrodynamic bearings

a. the oil film pressure is generated only by therotation of the journalb. the oil film is maintained by supplying oil

under pressurec. do not require external supply of lubricantd. grease is used for lubricatione. none of the above

1208. The usual clearance provided inhydrodynamic bearing per mm of diameter of shaft isa. 0.1 micron b. 0.01 micronc. 1 micron d. 10 micronse. 25 microns

1209. In hydrostatic bearingsa. the oil film pressure is generated only by the

rotation of the journalb. the oil film is maintained by supplying oil

under pressurec. do not require external supply of lubricantd. grease is used for lubricatione. none of the above

1210. In V-belt drive, belt touchesa. at bottomb. at sides only

c. both at bottom and sidesd. could touch anywheree. none of the above

1211. Strength of a rivet in bearing is given bya. P = St (p-d)t b. P =Sb t dc. P = -(/4)d2.Ss d. P =-(/4)d2.St e. P = Sb (p-d)t

1212. For riveted joints, the types of joint preferredisa. lap jointb. butt joint

c. overlapping jointd. any of the abovee. none of the above

1213. The distance from the centre line of the rowof rivet holes nearest the edge of plate to edgeof plate should be (where d =diameter of rivet)a. d b. 1-1.5dc. 1.5-2.5d d. 2.0-2.5de. 2.5-3.0d

1214. In the design of a riveted joint, efforts shouldbe made to make it strong against failure due to

a. tearingb. shearingc. bearing

d. equal against tearing, shearing and bearinge. none of the above

1215. If the tearing efficiency of a riveted joint is60% then the ratio of diameter to pitch of rivetis,a. 0.20 b. 0.33c. 0.40 d. 0.50e. 0.60

1216. Thickness of strap for double strap joint interms of thickness of plate ̀ t' is equal toa. 0.4 t b. 0.6 t to tc. 1.2 t d. 1.75 te. 2 t

1217. The following type of rivet head is used forboiler plate rivetinga. snap b. roundc. spherical d. diamonde. counter sunk

1218. Factor of safety is the ratio of a. yield stress/working stressb. tensile stress/working stressc. compressive stress/working stressd. bearing stress/working stresse. bearing stress/yield stress

1219. In an eccentric riveted connection, the rivetshave to resista. linear displacementb. rotary displacementc. linear as well as rotary displacementsd. linear or rotary displacemente. none of the above

1220. Efficiency of a riveted joint is the ratiobetween

a. tearing strength of the joint to the strength of a pitch length of the solid plate

b. shearing strength of the joint to the strengthof a pitch length of the solid plate

c. bearing strength of the joint to the strength of a pitch length of the solid plate

d. the minimum of the three strengths of a jointto the strength of a pitch length of the solidplate


1221. According to I.B.R the following type of jointis preferred for longitudinal joint

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a. lap jointb. butt jointc. welded joint

d. any one of the abovee. none of the above

1222. A riveted joint may fail due toa. shearing of the rivetb. tearing off the plate at an edgec. crushing of the rivetd. tearing off the plate across a row of rivetse. any or all of the above reasons

1223. According to I.B.R the following type of pointis preferred for circumferential jointa. lap jointb. butt jointc. welded jointd. any one of the abovee. none of the above

1224. In welded joint the throat of weld ascompared to size of weld isa. about same sizeb. about 0.7 timesc. about 0.5 timesd. about 0.25 timese. about 1.25 times

1225. Thick cylinders are designed by

a. Lame's equationb. calculating radial stress which is uniformc. thick cylinder theoryd. any one of the abovee. none of the above

1226. Oldham's coupling is used to connect twoshafts whicha. have lateral misalignmentb. whose axes intersect at a small anglec. are not is exact alignmentd. is the simplest type of rigid couplinge. all of the above

1227. In the flange coupling the two flanges arecoupled together by means of bolts fitted ina. reamed holesb. machined holesc. threaded holesd. gasketed holese. as cast holes

1228. The holes in the flange coupling for couplingthe two flanges together by bolts are reamedbecause it permitsa. equal sharing of load by bolts

b. avoidance of stress concentrationc. avoidance of any injury during dismantlingd. less wear, tear and vibrations

e. full utilisation of power

1229. The sleeve of muff coupling is designed as aa. thin vessel b. thick vesselc. solid shaft d. hollow shafte. all of the above

1230. Muff coupling is used to join two shaftswhicha. have lateral misalignmentb. whose axes intersect at a small anglec. are not in exact alignmentd. is the simplest type of rigid couplinge. all of the above

1231. Keys are normally made froma. cold rolled mild steel barsb. forged steelc. hot rolled mild steel barsd. cold rolled carbon steele. machined stainless steel

1232. Screws used for power transmission shouldhavea. high efficiencyb. strong teethc. finished threads

d. high efficiency and strong teethe. proper heat treatment

1233. Bushed pin flexible coupling is used to jointwo shafts whicha. have lateral misalignmentb. whose axes intersect at a small anglec. are not in exact alignmentd. is the simplest type of rigid couplinge. all of the above

1234. Slenderness ratio isa. shaft dia/Shaft length

b. length of strut/least radius of gyrationc. column width/column depthd. max. size of column/min. size of columne. none of the above

1235. Rankine's formula is valid upto theslenderness ratio of a. 60 b. 120c. 180 d. 240e. 300

1236. Euler's buckling or cripping load correspondsto load `p'such that

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a. (P/EI) (l/2) = -/2b. (P/EI) (l/2) = c. (P/EI) (2l) =/2

d. (P/EI) l =/2e. none of the above

1237. The sharing stress in a helical spring of wirediameter `d' and having mean diameter `D',supporting a compressive load ̀ F' is given bya. (2FD/ d3) K b. (4FD/d3) K c. (8FD/d3) K d. (16FD/d3) K e. (32FD/d3) K

1238. The Wahl stress factor `K' for springs of spring index C = D/d = (Mean dia of coil/wirediameter) is given by

a. 4C-1/4C-2 +0.615/Cb. C-4/4C-4 +0.615/Cc. 4C-4/4C-1 +0.615/Cd. 4C-1/4C-4 +0.615/Ce. 4C-1/C-4 +0.615/C

1239. Value of Wahl stress factor `K' for springswith increase in value of ̀ C'a. decreases linearlyb. increasesc. remains samed. decreases exponentiallye. increases exponentially

1240. The deflection of helical spring is directlyand inversely proportional respectively toa. D2, d2 b. D3 , d2 c. D4 , d3 d. D3 , d4 e. D4 , d4 Where D =mean diameter of coil andd =wire diameter

1241. Cocentric helical springs should bea. wound in same directionb. wound with opposite hand helicesc. could be wound in any directiond. direction of winding depends on the load to

be carriede. none of the above

1242. Allowable stresses in compression springsfor most of the materials with increase in size of wire willa. increase b. decreasec. remain same d. unpredictablee. none of the above

1243. Which is true statement about Bellevillesprings

a. these are used for dynamic loadsb. these are composed of coned discs which

may be stacked upto obtain variety of load

deflection characteristicsc. these are commonly used in clocks andwatches

d. these take up torsional loadse. these do not exist

1244. Angle of twist of shaft is inverselyproportional toa. shaft diameterb. (shaft diameter)2 c. (shaft diameter)3 d. (shaft diameter)4 e. none of the above

1245. For a shaft subjected to a torque T andbending moment `M', the equivalent twistingmoment isa. (T2+M2)/2 b. 2(Q2+T2)c. [(M/2)+M2+T2] d. (M2+T2)e. [T2+(M2/2)]

1246. In a horizontal flat belt drive, it is customaryto usea. bottom side of the belt as the slack side

during the transmission of powerb. top side of the belt as the slack sidec. crossed-beltingd. idler in betweene. none of the above

1247. Centrifugal tension in beltsa. reduces power transmissionb. increases power transmissionc. does not affect power transmissiond. increases power transmission at high speed

and decreases it at lower speede. un predictable

1248. The standard angle between the sides of V-belt is

a. 25 b. 30 c. 40 d. 45 e. 60

1249. For spur gear, the product of circular pitchand diametral pitch is equal toa. unity b. 1/ c. d. modulee. pitch circle diameter

1250. The part of the tooth between the pitch circleand dendendum circle is called

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a. half tooth b. flankc. face d. upper toothe. lower tooth

1251. Stub tooth in gearsa. is standard toothb. is longer than standard toothc. is shorter than standard toothd. has special profilee. is used where great precision in transmission

is required

1252. Backlash in spur gears is thea. difference between the dendendum of one

gear and the addendum of the mating gearb. difference between the tooth space of one

gear and the tooth thickness of the matinggear measured on the pitch circle

c. intentional extension of centre distancebetween two gears

d. does not existe. none of the above

1253. Lewis equation in gears used to find thea.tensile stressb. compressive stress in bendingc. contact stressd. fatigue stresse. endurance stress

1254. Involute profiles in gears are very popularbecause of the following advantagea. pressure angle is constantb. face and flank of a tooth form a continuous

curvec. all gears having the same pitch and pressure

angle work correctly togetherd. involute rack is a straight linee. all of the above

1255. The value of form factor used in design of gear isa. independent of the size of the tooth

b. depends on the number of teeth on a gearc. depends on the system of the teethd. all of the abovee. (b) and (c) above

1256. Compared to spur gears, helical gearsa. run more smoothlyb. run with more vibrations and noisec. run exactly aliked. consume more powere. consume less power

1257. In helical gears, the right hand helix willmesh witha. right hand helix

b. left hand helixc. both of the aboved. any one of the abovee. none of the above

1258. The limiting pitch line velocity of commercially cut gears is abouta. 1 m/sec b. 5 m/secc. 10 m/sec d. 20 m/sece. 30 m/sec

1259. For accurately cut gears operating atvelocities upto 20 m/sec, the velocity factor isequal toa. 3/(3+V) b. 6/(6+V)c. 9/(9+V) d. [0.75/(1+V)]+0.25e. none of the abovewhere v =pitch line velocity in m/sec

1260. If both pinion and gear are made of thesame material, then the load transmittingcapacity is decided bya. gearb. pinionc. any one of the twod. both should be considered independently for

tooth strength

e. there are many other considerations1261. Zero axial thrust is experienced in

a. helical gears b. bevel gearsc. spiral gears d. worm gearse. herringbone gears

1262. Bearing characteristic number relating Z-absolute viscosity of lubricant, N-speed of

journal and P-bearing pressure on projectedbearing area isa. ZN/p b. p/NZc. Z/pN d. N/pZe. pN/Z

1263. Antifraction bearings area. sleeve bearingsb. gas lubricated bearingsc. ball and roller bearingsd. special bearings requiring no lubricante. plastic bearings

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b. in liquid formc. in solid formd. under high pressure

e. under low pressure1280. In sand moulding the bottom most part of flask is calleda. cope b. cheekc. drag d. flask bottome. none of the above

1281. The purpose of gate is toa. feed the casting at a rate consistent with the

rate of solidificationb. act as reservoir as for molten metalc. help feed the casing until all solidification

takes placed. feed molten metal from pouring basin to gatee. none of the above

1282. Honey combing/sponginess refer toa. presence of impurities in molten metalb. molten metal at low temperaturec. formation of a number of cacvities in close

proximity in castingd. defects due to poor heat treatmente. surface defects produced during hot working

1283. Steel and cast iron pipes are cast bya. die castingb. continuous casting

c. true centrifugal castingd. centrifuginge. investment casting

1284. Large and heavy castings are made bya. green sand moulding b. pit mouldingc. dry sand moulding d. pressure mouldinge. machine moulding

1285. Graphite moulds are used for continuouscasting process in order to providea. non-wetting agentb. self lubricating qualities

c. chilling effectd. quick solidification of e. machine moulding metal

1286. cooling is the operation of a. cold forging b. hot forgingc. cold extrusion d. piercinge. reeling

1287. Seaging is an operation of a. hot rolling b. forgingc. extrusion d. piercine. drawing

1288. Seamless tubes are made bya. piercing b. extrusion

c. cold rolling d. plug rollinge. rolling mill

1289. In four high rolling milol the bigger rollers arecalleda. guide rolls b. back up rollsc. main rolls d. support rollse. none of the above

1290. Laser is produced bya. graphite b. rubyc. diamond d. emeralde. aluminium

1291. A 20 ton press implies that thea. weight of press is 20 tonsb. press can handle works weighing upto 20

tonsc. it can exert pressure upto 20 tonsd. its foundation should be designed for 20 tonse. its turnover in a day is 20 tons

1292. The fatigue strength of metal is improved bysetting up compressive stress in the surface bya process known asa. lancing b. spinningc. hemming d. shot-peeninge. slugging

1293. In drawing operation the metal flows due toa. ductility b. work hardeningc. plasticity d. shearinge. yielding

1294. The process of jigs and fixtures is toa. increase production rateb. increase machining accuracyc. facilitate interchangeable manufactured. enable employ less skilled operatorse. all of the above

1295. Which of the following methods producesgear by generating processa. hobbing b. castingc. punching d. millinge. broaching

1296. Gears are best mass produced bya. milling b. hobbingc. shaping d. forminge. casting

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1297. Which of the following is a gear finishingoperationa. hobbing b. shaping

c. milling d. shaving or burnishinge. none of the above

1298. In lathe, the carriage and tail stock areguided ona. same guidewaysb. different guidewaysc. not guided on guidewaysd. not guided on guidewayse. none of the above

1299. Tumbler gears are the gears used ina. milling machine to change direction of

rotation by 90°b. dividing headc. lathe for increasing/decreasing cutting speedd. lathe for cutting threadse. lathe for reversing direction of rotation

1300. In machine tools, chatter is due toa. free vibrations b. random vibrationsc. forced vibrations d. self excited

vibrationse. cutting vibrations

1301. Half nut is connected witha. milling machine b. locking devicec. jigs and fixtures d. thread cutting on lathee. quick engaging and disengaging devices

1302. Lathe spindle has gota. internal threads b. external threadsc. taper threads d. no threadse. none of the above

1303. Quick return mechanism is used ina. milling machine b. broaching machinec. grinding machine d. slottere. welding machine

1304. Which of the following machines does notrequire quick return mechanisma. slotter b. planerc. shaper d. broachinge. none of the above

1305. The size of a power circular saw is indicatedby thea. blade diameter b. motor horse powerc. saw weight d. number of gulletse. maximum depth of out

1306. Circular saw blades are specified by theirdiameter, number of teeth anda. gauge b. maximum rpm

c. arbor-hole d. number of gullerse. all of the above

1307. Tool life is said to be over if a. poor surface finish is obtainedb. sudden increase in power and cutting force

with chatting take placec. overheating and fuming due to friction startd. all of the abovee. it can not longer machine

1308. Tool life is most affected bya. cutting speedb. tool geometryc. feed and depthd. microstructure of materiale. not using coolant and being cut lubricant

1309. The spindle speeds of machine tools areusually designed to followa. arithmetical progressionb. geometrical progressionc. harmonical progressiond. logarithmic progressione. random number theory

1310. Flank wear occurs mainly on

a. nose part, front relief face and side relief face

b. nose part and top facec. cutting edgesd. all of the abovee. front face

1311. In a capstan lathe, the turret is mounted ona. a short side of ram sliding on the saddleb. the saddle sliding on the bedc. compound restd. back tool poste. head stock

1312. Galvanising isa. a zinc diffusion processb. an oxidizing process used for aluminmium

and magnesium articlesc. a process used for making thin phosphate

coatings on steel to act as a base or primerfor enamels and paints

d. is the process of coating of zinc by hotdipping


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1313. The C.L.A. valve is used for measurementof a. metal hardness

b. surface roughnessc. surface dimensionsd. sharpness of tool edgee. machinability

1314. The front rake required to machine brass byH.S.S tool isa. 15° b. 10°c. 5° d. 0°e. -5°

1315. The best all-round coolant for carbide toolsisa. soluble oil b. kerosenec. terpentine oil d. compressed aire. soap water

1316. Undersutting is the operation of cuttinga. below the specified sizeb. a deep groovec. a spitald. a groove next to shouldere. with high depth of cut

1317. Which of the following taper turning methodscan be used only for turning external tapera. form tool b. tailstock offsetc. taper attachment d. compound reste. all of the above

1318. The following gauge is used to check holesa. ring gauge b. snap gaugec. plug gauge d. dial gaugee. micrometer screw gauge

1319. The included angle of lathe centres isa. 30° b. 45°c. 60° d. 90°e. 120°

1320. The taper min lathe spindle

a. 1 : 10 b. 1 : 12c. 1 : 15 d. 1 :20e. 1 : 30

1321. In electro-discharge machining, the tool ismade of a. tungsten carbideb. properly heat treated alloy steelc. diamondd. brass or coppere. stainless steel

1322. Which is false statement about electro-discharge machininga. it can machine very hard materials

b. very good surface finish is obtainedc. section to be machined should be thickd. metal removal rate is very slowe. even heat treated metals can be machined

1323. In electro-chemical milling operation, thegap between tool and work is kept of the orderof a. no gap, two are in contact with each otherb. 0.25 mm c. 0.75 mmd. 1.25 mm e. 5 mm

1324. A big advantage of electro-chemicalmachining over electro- discharge machining isthata. it can cut harder materialsb. it is more accurate and precisec. it consumes less powerd. its cost is lowe. tool wear is negligible

1325. The size of abrasive grains in abrasive jetmachining varies betweena. 1 to 10 micronsb. 10 to 50 micronsc. 50 to 100 micronsd. 100 to 500 microns

e. 500 to 1000 microns

1326. Which is correct statement about electro-chemical grinding operationsa. grinding pressure is highb. very hard materials can be ground preciselyc. defects like grinding cracks, tempering of

work take placed. dimensional control is little probleme. none of the above

1327. LASER stands fora. light amplification by stimulated emission of

radiationb. light amplification by strong emission of

radiationc. light amplification by stimulated energy of

radiationd. light amplificant by stimulated emission of

radioactivitye. none of the above

1328. Laser beam machining process is used formachininga. very thick materialsb. thin materials

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c. heavy sectionsd. is not used for machininge. there is no such limitation

1329. In abrasive jet machining process, theabrasive particles should bea. perfectly roundb. made of diamond powderc. around 1 mm in sized. of irregular shapee. none of the above

1330. Ultrasonic machining removes material bya. direction vibration of tool with workpieceb. using abrasive slurry between tool and workc. vibrating air in vicinity of tool and workpiece

and making no contactd. all of the abovee. none of the above

1331. Ultrasonic machining finds application fora.production of tapped holes and threads in

brittle materialsb. die castingc. machining sintered carbides, diamonds etc.d. all of the abovee. none of the above

1332. Ultrasonic machining method is bed suitedfor

a. brittle materials b. stainless steelc. plastics d. leade. non-ferrous alloys

1333. The following non-conventional method of machining essentially requires electrolytea. EDM b. ECMC. LBM d. UTMe. IBM

1334. Electro-discharge machining uses thefollowing dielectric fluida. water b. aqueous salt solution

c. sodium hydroxide d. kerosenee. lard oil

1335. Crater wear occurs mainly due to followingphenomenaa. abrasion b. diffusionc. oxidation d. adhesione. all of the above

1336. Chips with built up edge can be expectedwhen machininga. hard material b. brittle materialc. tough material d. ductile material


1337. Crater wear takes place in a single point

cutting tool ata. flank b. side rakec. face d. tipe. none of the above

1338. 18-4-1 high speed steel contains followingelements in the ratio of 18-4-1a. tungsten (W), Chromium (Cr) and Vanadium

(V)b. Cr, V, W c. W, Mn, Crd. W, V, Cr d. W, Cr, Mn

1339. The main function the cutting fluid is toa. provide lubricationb. cool the tool and work-piecec. wash away the chipsd. improve surface finishe. all of the above

1340. Which of the following is used as cuttingfluid for the turning and milling operation onalloy steelsa. CO2 b. kerosenec. soluble oil d. heavy watere. sulphurised mineral oil

1341. Continuous chips will be formed when

machining speed isa. high b. lowc. medium d. irrespective of cuttinge. away from the design value

1342. Which of the following is the chip removalprocessa. rolling b. extrudingc. die casting d. broachinge. forging

1343. Ceramic tools are made froma. tungsten oxide b. silicon carbide

c. cobalt d. aluminium oxidee. diamond sand

1344. Discontinuous chips will be formed whenmachining speed isa. highb. lowc. mediumd. irrespective of cuttinge. away from the design value speed

1345. Size of shaper is specified bya. length of table

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c. to permit easy access of coolant at tool pointd. to permit short segmented chipse. to increase tool life

1362. A cutting tool having tool signature as10,10,6,6,8,8,2 will have back angle asa. 10° b. 6°c. 8° d. 2°e. none of the above

1363. The last element in the tool signature isa. back rake angle b. side rake anglec. nose radius d. end cutting edge anglee. side relief angle

1364. Pick up the correct statement for up-millinga. cutter is rotated is the opposite direction of

travel of jobb. thickness of chip is maximum at the

beginning of cutc. cutting force is directed downwardsd. coolant can be easily poured on the cutting

edgee. all of the above

1365. In grinding operation, for grinding softermaterialsa. coarser grain size is usedb. fine grain size is usedc. medium grain size is used

d. any grain size may be usede. none of the above

1366. Which abrasive particle would you choosefor grinding bronze valve bodies?a. silicon carbide b. aluminium oxidec. diamond d. cubic boron nitridee. none of the above

1367. Which of the following is the naturalabrasivea. Al2O3 b. SiCc. Boron carbide d. Corundam

e. Borolon

1368. Which of the following is the manufacturedabrasivea. corundam b. quartzc. emergy d. SiCe. diamond

1369. Aluminium oxide wheel would be selectedfor grindinga. cast iron b. cemented carbidec. ceramic materials d. HSSe. all of the above

1370. The first symbol in a grinding wheel code isthe

a. bond type b. abrasive typec. grain size d. structuree. bondgrade

1371.A grinding wheel is completely specified bythe following elements taken in ordera. type of abrasive, grain size, grade, structure,

bondb. grain size, grade, structure, type of abrasive,

bondc. structure, bond, grain size, type of abrasive,

graded.bond, structure, grain size, type of

abrasive,grade, bonde. none of the above

1372. Tolerances are specifieda. to obtain desired fitsb. because it is not possible to manufacture a

size exactlyc. to obtain higher accuracy

1373. The most suitable machine for drilling holesin rifle barrels isa. ultrasonic machiningb. laser machiningc. radial drilling machine

d. deep hole drilling machinee. plasma arc drilling

1374. A twist drill is specified bya. an alphabet specifying hole sizeb. a number specifying hole sizec. the size of hole it can drilld. any one of the abovee. none of the above

1375. The flutes of a drill perform the followingfunctiona. help from the cutting edge of the drill point

b. curb the chip tightly for easier removalc. form channels through which the chips can

escape from the hole being drilledd. allow the coolant and lubricant to get down to

the cutting edgee. all of the above

1376. Buffing process is useda. to achieve flatnessb. to achieve roundnessc. to improve surface finishd. to obtain very smoothe. not used in workshops reflective surfaces

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1377. Surface plate is usually made of grey castiron because it provides

a. non-wearing plateb. very hard platec. easy to cast plated. lubrication due to graphitee. stable plate flakes

1378. Expressive a dimension as 25.3 ±0.05 mmis the case of a. unilateral tolerance b. bilateral tolerancec. limiting dimensions d. all of the abovee. none of the above

1379. Annealing is done by cooling ina. air b. furnacec. water d. bringe. none of the above

1380. Gear cutting with a hob does not involve thefollowing motions

a. indexing of the work b. rotation of hobc. rotation of blank d. radial feed of hobe. all of the above

FLUID MECHANICS

1381. A fluid is a substance thata. always expands until it fills any containerb. is practically impressiblec. can’t be subjected to shear forcesd. can’t remain at rest under action of any shear

forcee. has the same shear stress at a point

regardless of its motion

1382. Newton’s law of viscosity relatesa. pressure, velocity & viscosityb. shear stress and rate of angular deformation,

in a fluidc. shear stress, temperature, viscosity &

velocityd. pressure. viscosity & rate of angular

deformatione. yield shear stress, rate of angular

deformation & viscosity

1383. An object has a mass of 2 kg & gravity forceof 19 N on a spring balance. The value of gravity in m/s² isa. 0.105 b. 2c. 9.5 d. 19e. none of the above

1384. An unbalanced force of 10 N exarted on 2 kgmass on a planet where g =10 m/s²a 0.2 b. 2c. 5 d. 20e. none of the above

1385. The gravity force in Newton’s of 3 kg masson a planet where g =10 m/s² isa. 0.3 b. 3.33c. 29.42 d. 30e. none of the above

1386. Viscosity has the dimensions

a. FL-2 b. FL-1 T-1 c. FLT-2 d. FL2 T

e. FTL-2

1387. Shear forces in a fluida. can never occur when the fluid is at restb. may occur due to cohesion when the liquid is

at restc. depend upon molecular interchange of

momentumd. depend upon cohesive forcese. can never occur in a frinctionless fluid,

regardless of its motion

1388. The unit of dynamic viscosity isa. m.s/kg b. N.m/s²c. kg.s/N d. N.s/m2

1389. The dimensions of kinematic viscosity area. FL-2 T b. ML-1 T-1

c. L2 T2

d. L2 T-2

e. L2 T-2

1390. For =3 x 10-8 m²/s =800 kg/m3, equalsa. 3.75 x 10-11 b. 2.4 x 10-5

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d. is expressed by 1/A + (v/V)2 dAe. is expressed by 1/A + (v/V)3 dA

1405.A pitot tube is used to measure velocity of flow of fluid of specific gravity 0.90. The fluid

level inside the tube is 50 mm higher than thesurface of flowing fluid. The velocity is(m/s)a. 0.89 b. 0.99c. 1.10 d. 1.40e. none of the above

1406. The theoritical velocity of oil S=0.75 flowingfrom an orifice in a reservoir under a head of 4ms is (in m/s)a. 6.7 b. 8.86c. 111.8 d. data insufficiente. none of the above

1407. If all losses are neglected, the pressure atthe summit of a siphona. is a minimum for the siphonb. depends on height of summit above

upstream reservoirc. is independent of downstream lengthd. is independent of discharge and density

1408. Select from the following list the correctassumptions for analyzing the flow of a jet thatis deflected by a fixed/moving vane1. The momentum of the jet is unchanged

2. The abs. speed doesn’t change along thevane

3. The fluid flows on the vane without shock4. The flow from the nozzle is steady5. Friction between jet and vane is neglected6. The jet leaves without velocity7. The velocity is uniform over the C.S of the

jeta. 1,3,4,5 b. 2,3,5,6c. 3,4,5,6 d.3,4,5,7e. 3,5,6,7

1409. The losses due to sudden expansion is

a. (V12-V22)/2g b. (V1V2)/2gc. (V2

2-V12)/g d. (V1-V2)

2/ge. (V1-V2)

2/2g

1410. Reynolds number may be defined as theratio of a. viscous to inertia forcesb. viscous to gravity forcesc. gravity to inertia forcesd. elastic to pressure forcese. none of the above

1411. The shear stress in a fluid flowing betweentwo fixed parallel platesa. is constant over the cross-section

b. is ‘O’ at the plates and increases linearly tomid pointc. varies parabolically across the sectiond. is‘O’ at the midplane and is linear variant

from mid planee. none of the above

1412. The velocity distribution for flow betweentwo fixed parallel plates isa. uniform over the C.Sb. ‘O’at the plates and increases linearly to mid

planec. varies parabolically over the C.S

1413. The relation between pressure and shearstress in laminar flow in x direction isa. .p/.x = c/yb. OP/OY =1/xc. p/y =1/xd. p/x =1/y

1414. The shear stress in a fluid flowing in a roundpipea. is constant over the C.Sb. is zero at the wall and increases linearly to

the centrec. varies parabolically across the section

d. is zero at the centre and varies linearly withradius

1415. In laminar flow through round tube thedischarge variesa. linearly as viscosityb. as square of radiusc. inversely as pressure dropd. inversely as viscositye. as cube of diameter

1416. The upper critical Reynold’s No. isa. important from design view point

b. the number at which turbulent flow changesto laminar flow

c. about 2000d. not more than 2000e. none of the above

1417. Reynold’s No. for pipe flow is given bya. VD/Cb. VD/Pc. VDP/Td. VD/K e. none of the above

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1418. The lower critical Reynold’s No. has thevaluea. 200

b. 1200c. 12000d. 40000e. none of the above

1419. The hydraulic radius is given bya. wetted perimeter divided by areab. area perimeter divided square of wettedc. square root of aread. area divided by wetted perimetere. none of the above

1420. The hydraulic radius of a 60 mm wide by120 mm deep open channel is in mma. 20b. 24c. 40d. 60e. none of the above

1421. The friction factor in turbulent flow in smoothpipes depends ona. V,D,P,Lb. Q,L,Pc. V,D,P,Pd. V,D,Pe. P,L,D,Q,V

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