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All Electrical Engineering MCQs

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

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1121Electrical EngineeringMedium

The Q of an LC circuit is given by ________?

AR / 2pfrL

BR2/2pfrL

C2pfr x R

D2pfrL / R

Correct answer

D. 2pfrL / R

Explanation

The correct answer is 2pfrL / R.

1122Electrical EngineeringMedium

At parallel resonance, the line current is________?

ANone of the above

BMaximum

CMinimum

DQuite large

Correct answer

C. Minimum

Explanation

The correct answer is Minimum.

1123Electrical EngineeringMedium

When the modulating signal controls the frequency of the carrier, we get________?

AAmplitude modulation

BFrequency modulation

CMay be any one of the above

DPhase modulation

Correct answer

B. Frequency modulation

Explanation

The correct answer is Frequency modulation.

1124Electrical EngineeringMedium

The underground system cannot be operated above________?

A440 V

B66 kV

C33 kV

D11 kV

Correct answer

B. 66 kV

Explanation

The correct answer is 66 kV.

1125Electrical EngineeringMedium

According to application, instruments are classified as________?

Aswitch board

Bmoving coil

Cboth D. and E.

Dboth A. and B.

Eportable

Fmoving iron

Correct answer

D. both A. and B.

Explanation

The correct answer is both A. and B..

1126Electrical EngineeringMedium

Alternating current is measured by________?

Aelectrostatic ammeter

Binduction ammeter

Cmoving iron repulsion type voltmeter

Dpermanent magnet type ammeter

Correct answer

B. induction ammeter

Explanation

The correct answer is induction ammeter.

1127Electrical EngineeringMedium

In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is________?

A8.75

C3.2

D11.4

Correct answer

D. 11.4

Explanation

The correct answer is 11.4.

1128Electrical EngineeringMedium

If a 3-phase supply is given to the stator and rotor is short circuited rotor will move________?

Ain the opposite direction as the direction of the rotating field

Bin any direction depending upon phase squence of supply

Cin the same direction as the direction of the field

Correct answer

C. in the same direction as the direction of the field

Explanation

The correct answer is in the same direction as the direction of the field.

1129Electrical EngineeringMedium

A crystal diode has forward resistance of the order of ________?

AΩ

BkΩ

CMΩ

Dnone of the above

Correct answer

A. Ω

Explanation

The correct answer is Ω.

1130Electrical EngineeringMedium

For frequencies above the resonant frequency, a parallel LC circuit behaves as a ________ load?

ACapacitive

BInductive

CNone of the above

DResistive

Correct answer

A. Capacitive

Explanation

The correct answer is Capacitive.

If a 3-phase supply is given to the stator and rotor is short circuited rotor will move________?

Ain the opposite direction as the direction of the rotating field

Bin any direction depending upon phase squence of supply

Cin the same direction as the direction of the field

Correct answer

C. in the same direction as the direction of the field

Explanation

The correct answer is in the same direction as the direction of the field.