LAHORE ELECTRIC SUPPLY COMPANY

(LESCO) TEST FOR KARACHI CANDIDATES

JUNIOR ENGINEER ELECTRICAL & ELECTRONICS TEST 25-OCT-2020

PART 1: GENERAL KNOWLEDE + ISLAMIC STUDIES+IT

MCQ’S

Q1) The minimum numbers of rows and columns in MS Ward is

A) 1 and 1

B) 2 and 1

C) 1 and 2

D) 2 and 2

Ans) A

Q2) which new department has been established for locust control

(Ans)

Q3) Indus water treaty was signed in (1960)

Q4) When M.A.O. College was established in Aligarh

A) 1877

B) 1875

C) 1873

D) 1872

Ans) A

Q5) Basis of Islam is

A) Quran and Sunnah

B) Quran, Hadith and Sunnah

C) Hadith

D) Sunnah

Ans) A

Q6) In star topology all the computers are connected controller is

called

A) Server

B) Telephone

C) Hub

D) Modem

Ans) B

Q7) Which of the following does not affect the speed of computer

(Mouse)

Q8) A line formed by the two regions ( Line segment)

Q9) Allah says is for me and I shall reward for it, this is for

A) Namaz

B) Fast

C) Jihad

D) All of the above

Ans) B

Q10) kharan desert is in

A) Punjab

B) Sindh

C) Baluchistan

D) North Punjab

Ans) C

Q11) The Budget session 2019-2020 was chaired by(Asad Qaiser)

Q12) Hazrat Bibi Ayesha (R.A) is daughter of

A) Hazrat Usman(R.A)

B) Hazrat Abu-Bakr siddiq (R.A)

C) Hazrat Umar(R.A)

D) Hazrat Ali(R.A)

Ans) B

Allah Says “Fasting is for me and I shall

reward for it”

Q13) Mohammad dam was inaugurated by (PM Imran Khan)

Q14) A function in x, y variables withs limits was given, the area of

curve was found (Definite Integral)

LAHORE ELECTRIC SUPPLY COMPANY

(LESCO) TEST FOR KARACHI CANDIDATES

JUNIOR ENGINEER ELECTRICAL & ELECTRONICS TEST 25-OCT-2020

PART: 2 TECHNICAL PORTION

Q15) In a hydro-electric plant, spillways are used.......?

A) To discharge all surplus water

B) To discharge surplus water on the downstream side of dam

C) Water is not not available in sufficient quantity

D) None of the above

Ans) B

Q16) Digital circuits consist of …………. Characteristics states?

A) One state

B) Two states

C) Three states

D) Four States

Ans) B

Q17) Semi-conductors have ………. Bond?

A) Covalent bond

B) Ionic bond

C) Both A & B

D) Hydrogen bond

Ans) A

Q18) There is capacitor in feed-back path of OP-Amp, then it called

as?

A) Summing amplifier

B) OP-Amp Differentiator

C) OP-Amp Integrator

D) Field effect transistor

Ans) C

Q19) The voltage that appears across the contacts at the instant of arc

in a circuit breaker is known as?

A) Arcing time

B) Recovery voltage

C) Re-striking voltage

D) Peak voltage

Ans) C

Q20) When the length of Arc increase in circuit breaker the resistance

will?

A) Increase

B) Decrease

C) Remain same

D) None of the above

Ans) A

Q21) Electrical conductors are metals mainly because metals possess

electrons in the outermost orbit where they are most loosely held and

can move around easily it conducts due to ………..?

A) Free Ions

B) Free electrons

C) Minority Carriers

D) High inductance

Ans) B

Q22) Triangular wave with 4 units mas has the average of

A) 4/radical 3

B) 4× radical 3

C) 4/radical 3

D)

Ans)

Q23) Isolator is a switch that is operated under ……… condition?

A) No load

B) Full load

C) Both A & B

D) None of the above

Ans) A

Q24) If MVA is doubled KV is halved the, Pu impedance is?

A) 2 times

B) 6 times

C) 8 times

D) 4 times

Ans) C

Q25) 60 Hz, motor can have maximum speed of?

A) 3000 rpm

B) 1500 rpm

C) 3600 rpm

D) 200 rpm

Ans) A

Q26) PN junction diode behave as?

A) Constant resistance

B) Variable resistance

C) Constant current source

D) Constant voltage source

Ans) C

Q27) Piezoelectric effect is positive in case of?

Ans)

𝒁𝑷𝒖 = 𝒁Ω × (𝑴𝑽𝑨)𝑩𝒂𝒔𝒆

(𝑲𝑽𝑨𝑩𝑨𝑺𝑬)𝟐

𝒁𝑷𝒖 = 𝒁Ω × (𝟐)𝑩𝒂𝒔𝒆

(𝟏/𝟐)𝟐

Q28) Super capacitor store energy in ……….. Field?

A) Electric

B) Magnetic

C) Electrostatic

D) None of the above

Ans) A

Q29) Electric field intensity is the?

A) Curl of potential

B) Gradient of potential

C) Both A & B

D) Sum of potential

Ans) B

Q30) The energy stored in inductor is directly proportional to?

A) Voltage

B) Current

C) Both A&B

D) Resistance

Ans) B

Q31) In RLC circuit at resonance (𝑿𝑳 = 𝑿𝑪)

Q32) Synchronous motor is?

A) Self-starting

B) Non self-starting

C) Both self and non-self-starting

D) None of the above

Ans) B

Q33) Ideal voltage source has?

A) Constant voltage and variable current

B) Constant current and variable voltage

C) Constant voltage and constant current

D) None of the above

Ans) A

Q34) The current sensitive instruments are?

A) PMMC

B) Hot wire instruments

C) Electrostatic instruments

D) Both A&B

Ans) D

Q35) Gauss’s law the net flux of an electric field in a closed surface is

directly proportional to the enclosed electric charge:

A) Ohm’s law

B) Ampere’s law

C) Gauss’s law

D) Stoke’s law

Ans) C

Q36) What is a load factor?

A) The ratio of average to maximum

demand.

B) The ratio of maximum demand to

average load

C) The product of maximum demand and average load.

D) The ratio of average load to the plant capacity.

Ans) A

Q37) Which of the following is an impulse turbine?

A) Pelton wheel

B) Kaplan turbine

C) Both A & B

D) None of the above

Gauss’s law states that the net flux of an electric

field in a closed surface is directly proportional to

the enclosed electric charge.

[Numerical question is asked

in paper values of average

and maximum demand is

given]

Ans) A

Q38) Solar cell produce which type of energy

A) AC

B) DC

C) Both A & B

D) None of the above

Ans) B

Q39) Which of the following does not stores energy in chemical

energy (Solar energy)

Q40) Which Chinese electric company has proposed 4th time to buy

66.40% shares of k electric

A) China Electric Company

B) North China Electric Company

C) China Electrical and Power Company

D) Shanghai Electric Power Company

Limited

Ans) D

Q41) Voltage and power of circuit is given [Question asked to find

resistance]

Q45) Ideal current source can provide

A) Constant voltage

B) Constant current

C) Both A&B

Fresh public announcement of

intention for acquisition

(directly or indirectly) of up to

66.40% of the voting shares of

K-Electric Limited by Shanghai

Electric Power Company

Limited, subject to receipt of

requisite regulatory and other

approvals.

D) Constant capacitance

Ans) B

Q47) Series RLC Circuit relation is for [Band pass Filter]