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All Electrical Engineering MCQs

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

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3411Electrical EngineeringMedium

A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are________?

A4 V, 6 V

B2 V, 6 V

C2 V, 4 V

D2 V, 2 V

Correct answer

C. 2 V, 4 V

Explanation

The correct answer is 2 V, 4 V.

3412Electrical EngineeringMedium

In the left hand rule, forefinger always represents________?

Acurrent

Bdirection of force on the conductor

Cmagnetic field

Dvoltage

Correct answer

C. magnetic field

Explanation

The correct answer is magnetic field.

3413Electrical EngineeringMedium

If the efficiency of a machine is to be high, what should be low ________?

ARatio of output to input

BTrue component of power

CInput power

DLosses

EkWh consumed

Correct answer

D. Losses

Explanation

The correct answer is Losses.

3414Electrical EngineeringMedium

In D.C. generators, current to the external circuit from armature is given through________?

Aslip rings

Bcommutator

Csolid connection

Dnone of above

Correct answer

B. commutator

Explanation

The correct answer is commutator.

3415Electrical EngineeringMedium

Economiser is used to heat________?

Aall above

Bair

Cfeed water

Dflue gases

Correct answer

C. feed water

Explanation

The correct answer is feed water.

3416Electrical EngineeringMedium

RC coupling is generally confined to low power applications because of________?

ANone of the above

BLarge value of coupling capacitor

CLow efficiency

DLarge number of components

Correct answer

C. Low efficiency

Explanation

The correct answer is Low efficiency.

3417Electrical EngineeringMedium

When a pure semiconductor is heated, its resistance________?

AGoes up

BCan’t say

CGoes down

DRemains the same

Correct answer

C. Goes down

Explanation

The correct answer is Goes down.

3418Electrical EngineeringMedium

The ripple factor of a half-wave rectifier is________?

B2.5

C1.21

D0.48

Correct answer

D. 0.48

Explanation

The correct answer is 0.48.

3419Electrical EngineeringMedium

The most inexpensive switch is ________ switch?

AElectronic

BElectromechanical

CNone of the above

DMechanical

Correct answer

A. Electronic

Explanation

The correct answer is Electronic.

3420Electrical EngineeringMedium

Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply?

ACopper oxide rectifiers

BElectrolytic rectifiers

CMechanical rectifiers

DMercury arc rectifiers

ESelenium rectifiers

Correct answer

B. Electrolytic rectifiers

Explanation

The correct answer is Electrolytic rectifiers.

3411Electrical EngineeringMedium

A 6 V battery output is divided down to obtain two output voltages. Three 2.2 kΩ resistors are used to provide the two taps. The two output voltages are________?

A4 V, 6 V

B2 V, 6 V

C2 V, 4 V

D2 V, 2 V

Correct answer

C. 2 V, 4 V

Explanation

The correct answer is 2 V, 4 V.

3412Electrical EngineeringMedium

In the left hand rule, forefinger always represents________?

Acurrent

Bdirection of force on the conductor

Cmagnetic field

Dvoltage

Correct answer

C. magnetic field

Explanation

The correct answer is magnetic field.

3413Electrical EngineeringMedium

If the efficiency of a machine is to be high, what should be low ________?

ARatio of output to input

BTrue component of power

CInput power

DLosses

EkWh consumed

Correct answer

D. Losses

Explanation

The correct answer is Losses.

3414Electrical EngineeringMedium

In D.C. generators, current to the external circuit from armature is given through________?

Aslip rings

Bcommutator

Csolid connection

Dnone of above

Correct answer

B. commutator

Explanation

The correct answer is commutator.

3415Electrical EngineeringMedium

Economiser is used to heat________?

Aall above

Bair

Cfeed water

Dflue gases

Correct answer

C. feed water

Explanation

The correct answer is feed water.

3416Electrical EngineeringMedium

RC coupling is generally confined to low power applications because of________?

ANone of the above

BLarge value of coupling capacitor

CLow efficiency

DLarge number of components

Correct answer

C. Low efficiency

Explanation

The correct answer is Low efficiency.

3417Electrical EngineeringMedium

When a pure semiconductor is heated, its resistance________?

AGoes up

BCan’t say

CGoes down

DRemains the same

Correct answer

C. Goes down

Explanation

The correct answer is Goes down.

3418Electrical EngineeringMedium

The ripple factor of a half-wave rectifier is________?

B2.5

C1.21

D0.48

Correct answer

D. 0.48

Explanation

The correct answer is 0.48.

3419Electrical EngineeringMedium

The most inexpensive switch is ________ switch?

AElectronic

BElectromechanical

CNone of the above

DMechanical

Correct answer

A. Electronic

Explanation

The correct answer is Electronic.

3420Electrical EngineeringMedium

Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply?

ACopper oxide rectifiers

BElectrolytic rectifiers

CMechanical rectifiers

DMercury arc rectifiers

ESelenium rectifiers

Correct answer

B. Electrolytic rectifiers

Explanation

The correct answer is Electrolytic rectifiers.