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All Electrical Engineering MCQs

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

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3111Electrical EngineeringMedium

The induced e.m.f. in a synchronous motor working on leading power factor will be________?

Aequal to the supply voltage

Bless than the supply voltage

CNone of these

Dmore than the supply voltage

Correct answer

D. more than the supply voltage

Explanation

The correct answer is more than the supply voltage.

3112Electrical EngineeringMedium

Which of the following protection is normally not provided on small distribution transformers?

AOvercurrent protection

BBuchholz relay

CAll of the above

DOverfluxing protection

Correct answer

B. Buchholz relay

Explanation

The correct answer is Buchholz relay.

3113Electrical EngineeringMedium

D.C. shunt relays are made of________?

Amany turns of thick wire

Bfew turns of thick wire

Cmany turns of thin wire

Dfew turns of thin wire

Correct answer

C. many turns of thin wire

Explanation

The correct answer is many turns of thin wire.

3114Electrical EngineeringMedium

The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be________?

A400 N/C

B600 N/C

C1200 N/C

D800 N/C

Correct answer

D. 800 N/C

Explanation

The correct answer is 800 N/C.

3115Electrical EngineeringMedium

When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on________?

AJunction capacitance

BMinority carriers

CNone of the above

DMajority carriers

Correct answer

B. Minority carriers

Explanation

The correct answer is Minority carriers.

3116Electrical EngineeringMedium

The units of volume charge density are________?

AC/m

BC/m⁴

CC/m²

DC/m³

Correct answer

D. C/m³

Explanation

The correct answer is C/m³.

3117Electrical EngineeringMedium

Most common form of A.C. meters met with in every day domestic and industrial installations are________?

Ainduction type single phase energy meters

Ball of the above

Ccommutator motor meters

Dmercury motor meters

Correct answer

A. induction type single phase energy meters

Explanation

The correct answer is induction type single phase energy meters.

3118Electrical EngineeringMedium

________ instruments are those which measure the total quantity of electricity delivered in a particular time?

AIndicating

BRecording

CIntegrating

DAbsolute

Correct answer

C. Integrating

Explanation

The correct answer is Integrating.

3119Electrical EngineeringMedium

What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?

AThe slip of the motor will be 5%

BThe torque produced will be very large

CThe rotor will not run

DThe rotor will run at very high speed

Correct answer

C. The rotor will not run

Explanation

The correct answer is The rotor will not run.

3120Electrical EngineeringMedium

If I2 be the armature current, then speed of a D.C. shunt motor is________?

Avaries as la

Bproportional to la

Cindependent of Ia

Dvaries as (Ia)

Correct answer

C. independent of Ia

Explanation

The correct answer is independent of Ia.

3111Electrical EngineeringMedium

The induced e.m.f. in a synchronous motor working on leading power factor will be________?

Aequal to the supply voltage

Bless than the supply voltage

CNone of these

Dmore than the supply voltage

Correct answer

D. more than the supply voltage

Explanation

The correct answer is more than the supply voltage.

3112Electrical EngineeringMedium

Which of the following protection is normally not provided on small distribution transformers?

AOvercurrent protection

BBuchholz relay

CAll of the above

DOverfluxing protection

Correct answer

B. Buchholz relay

Explanation

The correct answer is Buchholz relay.

3113Electrical EngineeringMedium

D.C. shunt relays are made of________?

Amany turns of thick wire

Bfew turns of thick wire

Cmany turns of thin wire

Dfew turns of thin wire

Correct answer

C. many turns of thin wire

Explanation

The correct answer is many turns of thin wire.

3114Electrical EngineeringMedium

The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be________?

A400 N/C

B600 N/C

C1200 N/C

D800 N/C

Correct answer

D. 800 N/C

Explanation

The correct answer is 800 N/C.

3115Electrical EngineeringMedium

When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on________?

AJunction capacitance

BMinority carriers

CNone of the above

DMajority carriers

Correct answer

B. Minority carriers

Explanation

The correct answer is Minority carriers.

3116Electrical EngineeringMedium

The units of volume charge density are________?

AC/m

BC/m⁴

CC/m²

DC/m³

Correct answer

D. C/m³

Explanation

The correct answer is C/m³.

3117Electrical EngineeringMedium

Most common form of A.C. meters met with in every day domestic and industrial installations are________?

Ainduction type single phase energy meters

Ball of the above

Ccommutator motor meters

Dmercury motor meters

Correct answer

A. induction type single phase energy meters

Explanation

The correct answer is induction type single phase energy meters.

3118Electrical EngineeringMedium

________ instruments are those which measure the total quantity of electricity delivered in a particular time?

AIndicating

BRecording

CIntegrating

DAbsolute

Correct answer

C. Integrating

Explanation

The correct answer is Integrating.

3119Electrical EngineeringMedium

What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?

AThe slip of the motor will be 5%

BThe torque produced will be very large

CThe rotor will not run

DThe rotor will run at very high speed

Correct answer

C. The rotor will not run

Explanation

The correct answer is The rotor will not run.

3120Electrical EngineeringMedium

If I2 be the armature current, then speed of a D.C. shunt motor is________?

Avaries as la

Bproportional to la

Cindependent of Ia

Dvaries as (Ia)

Correct answer

C. independent of Ia

Explanation

The correct answer is independent of Ia.