Study mode · no timer

All Electrical Engineering MCQs

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

Answers and explanations are always visible Take this quiz

2771Electrical EngineeringMedium

In case of an inductance, current is proportional to________?

Aneither (A) nor (B)

Bboth A. and B.

Cvoltage across the inductance

Dmagnetic field

Correct answer

D. magnetic field

Explanation

The correct answer is magnetic field.

2772Electrical EngineeringMedium

Multi-layer helical windings are commonly used in the transformers as high voltage windings________?

Aupto 50 kV

Bupto 80 kV

Cfor 110 kV and above

Dupto 20 kV

Correct answer

C. for 110 kV and above

Explanation

The correct answer is for 110 kV and above.

2773Electrical EngineeringMedium

The condition for maximum power in case of D.C. motor is________?

Aback e.m.f. = | x supply voltage

Bback e.m.f. = 2 x supply voltage

Csupply voltage = | x back e.m.f

Dsupply voltage = back e.m.f

Correct answer

A. back e.m.f. = | x supply voltage

Explanation

The correct answer is back e.m.f. = | x supply voltage.

2774Electrical EngineeringMedium

Superconducting metal in super conducting state has relative permeability of________?

Amore than one

Bone

Czero

Dnegative

Correct answer

C. zero

Explanation

The correct answer is zero.

2775Electrical EngineeringMedium

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as________?

Alocked-rotor torque

Bsynchronous torque

Creluctance torque

Dpull up torque

Correct answer

A. locked-rotor torque

Explanation

The correct answer is locked-rotor torque.

2776Electrical EngineeringMedium

In a system low friction co-efficient facilitates________?

Aincreased velocity lag error

Breduced time constant of the system

Cincreased speed of response

Dreduced velocity lag error

Correct answer

D. reduced velocity lag error

Explanation

The correct answer is reduced velocity lag error.

2777Electrical EngineeringMedium

Which of the following statements regarding two value capacitor motor is incorrect?

AIt is preferred to permanent-split single-value capacitor motor where frequent reversals are required

BIt has high starting torque

CIt is a reversing motor

DIt has low starting as well as rushing currents

Correct answer

A. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

Explanation

The correct answer is It is preferred to permanent-split single-value capacitor motor where frequent reversals are required.

2778Electrical EngineeringMedium

For crane travel which of the following motors is normally used?

AWard-Leonard controlled D.C. shunt motor

BSynchronous motor

CD.C. differentially compound motor

DAC. slip ring motor

Correct answer

D. AC. slip ring motor

Explanation

The correct answer is AC. slip ring motor.

2779Electrical EngineeringMedium

What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________?

A45°

B180°

C90°

D0°

Correct answer

C. 90°

Explanation

The correct answer is 90°.

2780Electrical EngineeringMedium

A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be________?

A1000 uF

B100 nF

C10 uF

D10 F

Correct answer

C. 10 uF

Explanation

The correct answer is 10 uF.

Which of the following statements regarding two value capacitor motor is incorrect?

AIt is preferred to permanent-split single-value capacitor motor where frequent reversals are required

BIt has high starting torque

CIt is a reversing motor

DIt has low starting as well as rushing currents

Correct answer

A. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

Explanation

The correct answer is It is preferred to permanent-split single-value capacitor motor where frequent reversals are required.