1

TEST I

ENGINEERING SCIENCES II (SSD 12103)

By john jabaraj

Name: Class :

1. a}Sketch laminar flow around the figure.

{1m} b} Find the mass of 0.333 m3 of water with density of 1000 kg/m3.

{1m} c} The volumetric flow-rate, Qvof water flowing thru a straw of c/s area 0.0025 m2 is 15 cm3/s. Determine the; a} velocity

b} mass flow-rate, Qm.

{4m} c} For the hydraulics system here;

555N

i. pressure at circular input piston.

ii. force(F) at output piston.

input piston A= r =2.2m A= 1.3m

F

output piston

{4m}2. a}Makcik Lembu likes extreme sport but what she loves best is skateboarding down high curving ramps. On a particular curve she oscillates following the equation; X = -9.5 cos ( 3.33 t ) m

Determine the makciks: i.amplitude

ii.frequency

iii.displacement at 2.2 seconds

iv. time when displacement is -5.5m

{8m} b}The Navy ship blows its horns when it spots a pirate ship which is 2222 m away. The intensity of the horns sound heard at the pirate ship is 777 W/m2. Find the intensity of the sound that will reach a lighthouse that is 1001 m away.

pirate

Navy lighthouse

2222m

1001m {2m}

3. a}Explain the process of Vaporization phase change with labeled diagrams.

{1m}b}The data below shows the temperature values of some quantities in 3 different temperature scales. Calculate the missing temperature values of X, Y and Z.

{6m}TCTFTK

Boiling Point of Water100212373.15

Melting Point of Water032273.15

Normal Human Body36.9X310.05

At the North PoleY-85.1Z

c}A wax candle has a mass of 0.07kg at the room temperature of 30oC. Calculate the total heat needed to raise the temperature and melt the candle completely.

WAX Melting pointBoiling pointcHfHv

47 oC400 oC2140 J / kg.Co222 kJ / kg371 kJ / kg

. {2m} d} A star radiates 9.2 x 1027 J of heat energy in a period of 1 minute. Determine the stars surface temperature if its radius is 5.5 x 107m while emissivity is 0.77.

{1m}-:EQUATIONS:-

Fluid & Pressure

= m

v

P = F A

PA= PB

P= g h

Qv = v A

Qm = v A

Heat & Temperature

TF = 1.8 TC + 32

TK = TC + 273.15

Q = m c ( T1 T0 )

Qf = + m Hf

Qv = + m Hv

L = Lo ( T )

V = Vo ( T )

Q = k A ( T ) t LQ = e A T4 t

Waves

f = 1 T

y = A cos ( t + kx )

= 2 f

k = 2 /

v = f

I = P / A

I a = ( r b )2

I b ( r a )2