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All Electrical Engineering MCQs

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

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171Electrical EngineeringMedium

The constant-current region of a JFET lies between________?

Acut off and saturation

Bpinch-off and breakdown

Cand IDSS

Dcut off and pinch-off

Correct answer

B. pinch-off and breakdown

Explanation

The correct answer is pinch-off and breakdown.

172Electrical EngineeringMedium

Between the incoming and outgoing devices in voltage commutation

ANo overlapping operation

BLarge overlapping takes place

CSmall overlapping operation

DNone of these

Correct answer

A. No overlapping operation

Explanation

The correct answer is No overlapping operation.

173Electrical EngineeringMedium

If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ________?

A2 kΩ

B20 kΩ

C5 kΩ

D10 kΩ

Correct answer

C. 5 kΩ

Explanation

The correct answer is 5 kΩ.

174Electrical EngineeringMedium

Which of the following battery is used for air-craft ________?

ANickel-iron battery

BDry cell battery

CLead-acid battery

DSilver oxide battery

Correct answer

A. Nickel-iron battery

Explanation

The correct answer is Nickel-iron battery.

175Electrical EngineeringMedium

The inverter is ________?

AAND gate

BNone of the above

COR gate

DNOT gate

Correct answer

D. NOT gate

Explanation

The correct answer is NOT gate.

176Electrical EngineeringMedium

Which of the following is the output of a thermocouple?

AAlternating current

BNone of the above

CD.C. voltage

DDirect current

EA.C. voltage

Correct answer

C. D.C. voltage

Explanation

The correct answer is D.C. voltage.

177Electrical EngineeringMedium

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be________?

A4 A/s

B32 A/s

C16 A/s

D64 A/s

Correct answer

A. 4 A/s

Explanation

The correct answer is 4 A/s.

178Electrical EngineeringMedium

By which of the following methods the temperature rise of windings and other parts may be determined?

AAny of the above

BResistance method

CEmbedded temperature detector method

DThermometer method

Correct answer

A. Any of the above

Explanation

The correct answer is Any of the above.

179Electrical EngineeringMedium

In which of the following motors the stator and rotor fields rotate simultaneously?

ASynchronous motor

BD.C. motor

CUniversal motor

DInduction motor

EReluctance motor

Correct answer

A. Synchronous motor

Explanation

The correct answer is Synchronous motor.

180Electrical EngineeringMedium

Constant voltage transmission entails the following disadvantage?

Aeither of the above

Blarge conductor area is required for same power transmission

Cnone of the above

Dshort-circuit current of the system is increased

Correct answer

D. short-circuit current of the system is increased

Explanation

The correct answer is short-circuit current of the system is increased.

171Electrical EngineeringMedium

The constant-current region of a JFET lies between________?

Acut off and saturation

Bpinch-off and breakdown

Cand IDSS

Dcut off and pinch-off

Correct answer

B. pinch-off and breakdown

Explanation

The correct answer is pinch-off and breakdown.

172Electrical EngineeringMedium

Between the incoming and outgoing devices in voltage commutation

ANo overlapping operation

BLarge overlapping takes place

CSmall overlapping operation

DNone of these

Correct answer

A. No overlapping operation

Explanation

The correct answer is No overlapping operation.

173Electrical EngineeringMedium

If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ________?

A2 kΩ

B20 kΩ

C5 kΩ

D10 kΩ

Correct answer

C. 5 kΩ

Explanation

The correct answer is 5 kΩ.

174Electrical EngineeringMedium

Which of the following battery is used for air-craft ________?

ANickel-iron battery

BDry cell battery

CLead-acid battery

DSilver oxide battery

Correct answer

A. Nickel-iron battery

Explanation

The correct answer is Nickel-iron battery.

175Electrical EngineeringMedium

The inverter is ________?

AAND gate

BNone of the above

COR gate

DNOT gate

Correct answer

D. NOT gate

Explanation

The correct answer is NOT gate.

176Electrical EngineeringMedium

Which of the following is the output of a thermocouple?

AAlternating current

BNone of the above

CD.C. voltage

DDirect current

EA.C. voltage

Correct answer

C. D.C. voltage

Explanation

The correct answer is D.C. voltage.

177Electrical EngineeringMedium

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be________?

A4 A/s

B32 A/s

C16 A/s

D64 A/s

Correct answer

A. 4 A/s

Explanation

The correct answer is 4 A/s.

178Electrical EngineeringMedium

By which of the following methods the temperature rise of windings and other parts may be determined?

AAny of the above

BResistance method

CEmbedded temperature detector method

DThermometer method

Correct answer

A. Any of the above

Explanation

The correct answer is Any of the above.

179Electrical EngineeringMedium

In which of the following motors the stator and rotor fields rotate simultaneously?

ASynchronous motor

BD.C. motor

CUniversal motor

DInduction motor

EReluctance motor

Correct answer

A. Synchronous motor

Explanation

The correct answer is Synchronous motor.

180Electrical EngineeringMedium

Constant voltage transmission entails the following disadvantage?

Aeither of the above

Blarge conductor area is required for same power transmission

Cnone of the above

Dshort-circuit current of the system is increased

Correct answer

D. short-circuit current of the system is increased

Explanation

The correct answer is short-circuit current of the system is increased.