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All Electrical Engineering MCQs

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

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1581Electrical EngineeringMedium

Which of the following generating station has minimum running cost?

ANuclear

BHydro

CDiesel

DThermal

Correct answer

B. Hydro

Explanation

The correct answer is Hydro.

1582Electrical EngineeringMedium

The voltage drop at anode, in a mercury arc rectifier is due to________?

Ahigh temperature inside the rectifier

Benergy spent in overcoming the electrostatic field

Chigh ionization potential

Dself restoring property of mercury

Correct answer

B. energy spent in overcoming the electrostatic field

Explanation

The correct answer is energy spent in overcoming the electrostatic field.

1583Electrical EngineeringMedium

A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be________?

A0.2 Hz

B2 Hz

C200 Hz

D50 Hz

Correct answer

B. 2 Hz

Explanation

The correct answer is 2 Hz.

1584Electrical EngineeringMedium

Maximum di / dt in a SCR is________?

ADirectly proportional to Vm of supply voltage

BBoth A and C

CInversely proportional to Vm of supply voltage

DInversely proportional to L in the circuit

Correct answer

A. Directly proportional to Vm of supply voltage

Explanation

The correct answer is Directly proportional to Vm of supply voltage.

1585Electrical EngineeringMedium

The chemical effect of current is used in ________?

Anone of the above

BD.C. energy meter

CD.C. ammeter hour meter

DD.C. ammeter

Correct answer

C. D.C. ammeter hour meter

Explanation

The correct answer is D.C. ammeter hour meter.

1586Electrical EngineeringMedium

In a synchronous motor, the armature current has large values for________?

Anone of the above

Bboth high and low excitation

Clow excitation only

Dhigh excitation only

Correct answer

B. both high and low excitation

Explanation

The correct answer is both high and low excitation.

1587Electrical EngineeringMedium

A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?

Athe size of the capacitor being quite big

Bthe capacitive reactance in ohms

Cthe current flowing in capacitor

Dthe statement is incorrect

Correct answer

D. the statement is incorrect

Explanation

The correct answer is the statement is incorrect.

1588Electrical EngineeringMedium

In a pure inductive circuit________?

Athe current can lead or lag by 90°

Bthe current lags behind the voltage by 90°

Cthe current leads the voltage by 90°

Dthe current is in phase with the voltage

Correct answer

B. the current lags behind the voltage by 90°

Explanation

The correct answer is the current lags behind the voltage by 90°.

1589Electrical EngineeringMedium

A field of force can exist only between________?

Atwo molecules

Btwo atoms

Ctwo metal particles

Dtwo ions

Correct answer

D. two ions

Explanation

The correct answer is two ions.

1590Electrical EngineeringMedium

Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?

AEye bolt

BEquilizer rings

CCommutator

DDummy coils

Correct answer

C. Commutator

Explanation

The correct answer is Commutator.

The voltage drop at anode, in a mercury arc rectifier is due to________?

Ahigh temperature inside the rectifier

Benergy spent in overcoming the electrostatic field

Chigh ionization potential

Dself restoring property of mercury

Correct answer

B. energy spent in overcoming the electrostatic field

Explanation

The correct answer is energy spent in overcoming the electrostatic field.