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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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1201Electrical EngineeringMedium

The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

A8R Ω

B4R Ω

CR Ω

D2R Ω

Correct answer

A. 8R Ω

Explanation

As per law of resistance, the resistance of the conductor is inversely proportional to its cross-sectional area i.e. it is inversely proportional to the square of the diameter of cross-sectional area of the conductor. As per same law of resistance, the resistance of the conductor is directly proportional to the length of the conductor.

1202Electrical EngineeringMedium

A 3 Q resistor having 2 A current will dissipate the power of________?

A2 watts

B12 watts

C4 watts

D6 watts

Correct answer

B. 12 watts

Explanation

The correct answer is 12 watts.

1203Electrical EngineeringMedium

Spread time is defined as the interval during which________?

Aanode voltage drops from 10 % of its initial value to zero

Banode current rises from 10 % to 90 % of its final value

Canode current rises from 90 % to its final value

Dboth (A) and (B)

Correct answer

C. anode current rises from 90 % to its final value

Explanation

The correct answer is anode current rises from 90 % to its final value.

1204Electrical EngineeringMedium

1 volt/meter is same as________?

A1 joule/coulomb

B1 newton meter

C1 meter/coulomb

Correct answer

B. 1 newton meter

Explanation

The correct answer is 1 newton meter.

1205Electrical EngineeringMedium

For series connected SCRs dynamic equalising circuit consists of________?

AR and C in series but with diode across R

BR and C in series but with diode across C

CSeries R and diode with C across R

Correct answer

A. R and C in series but with diode across R

Explanation

The correct answer is R and C in series but with diode across R.

1206Electrical EngineeringMedium

There is a need of transformer for________?

Abridge full-wave rectifier

Bcentre-tap full-wave rectifier

Cnone of the above

Dhalf-wave rectifier

Correct answer

B. centre-tap full-wave rectifier

Explanation

The correct answer is centre-tap full-wave rectifier.

1207Electrical EngineeringMedium

The voltage drop, for constant voltage transmission is compensated by installing________?

Anone of the above

Ball of above

Cinductors

Dsynchronous motors

Ecapacitors

Correct answer

D. synchronous motors

Explanation

The correct answer is synchronous motors.

1208Electrical EngineeringMedium

Diversity factor has direct effect on the________?

Aneither A. nor B.

Brunning cost of unit generated

Cfixed cost of unit generated

Dboth A. and B.

Correct answer

C. fixed cost of unit generated

Explanation

The correct answer is fixed cost of unit generated.

1209Electrical EngineeringMedium

Transistor biasing represents ________ conditions?

Anone of the above

Bboth a.c. and d.c

Ca.c

Dd.c

Correct answer

D. d.c

Explanation

The correct answer is d.c.

1210Electrical EngineeringMedium

If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to________?

AmA

B6 mA

C1 mA

D3 mA

Correct answer

D. 3 mA

Explanation

The correct answer is 3 mA.

The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

A8R Ω

B4R Ω

CR Ω

D2R Ω

Correct answer

A. 8R Ω

Explanation

Spread time is defined as the interval during which________?

Aanode voltage drops from 10 % of its initial value to zero

Banode current rises from 10 % to 90 % of its final value

Canode current rises from 90 % to its final value

Dboth (A) and (B)

Correct answer

C. anode current rises from 90 % to its final value

Explanation

The correct answer is anode current rises from 90 % to its final value.