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All Electrical Engineering MCQs

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841Electrical EngineeringMedium

In reverse blocking mode of a thyristor________?

Ajunction J3 is in forward bias and J1, J2 in reverse bias.

Bjunction J1, J3 is in reverse bias and J2 is in forward bias.

Cjunction J1 and J2 is in forward bias and J3 is in reverse bias.

Djunction J2 is in reverse bias and J1, J3 is in forward bias.

Correct answer

B. junction J1, J3 is in reverse bias and J2 is in forward bias.

Explanation

The correct answer is junction J1, J3 is in reverse bias and J2 is in forward bias..

842Electrical EngineeringMedium

Which of the following motors is inherently self starting?

ANone of these

BSplit motor

CShaded-pole motor

DReluctance motor

Correct answer

C. Shaded-pole motor

Explanation

The correct answer is Shaded-pole motor.

843Electrical EngineeringMedium

A crowbar is a circuit which is used to protect a________?

Avoltage sensitive load from excessive dc power supply output voltages

Bvoltage sensitive load from excessive ac power supply output voltages

Ccurrent sensitive load from excessive dc power supply output voltages

Dcurrent sensitive load from excessive ac power supply output voltages

Correct answer

A. voltage sensitive load from excessive dc power supply output voltages

Explanation

The correct answer is voltage sensitive load from excessive dc power supply output voltages.

844Electrical EngineeringMedium

Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules________?

AC2V

BCV2

CCV

Correct answer

B. CV2

Explanation

The correct answer is CV2.

845Electrical EngineeringMedium

In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is________?

A0 Hz

B3.5 kHz

C7 kHz

D0 Hz to 3.5 kHz

Correct answer

D. 0 Hz to 3.5 kHz

Explanation

The correct answer is 0 Hz to 3.5 kHz.

846Electrical EngineeringMedium

An ideal OP-AMP is an ideal________?

ACurrent controlled Current source

BVoltage controlled Current source

CVoltage controlled Voltage source

DCurrent controlled Voltage source

Correct answer

C. Voltage controlled Voltage source

Explanation

The correct answer is Voltage controlled Voltage source.

847Electrical EngineeringMedium

Which of the following motors is preferred for boom hoist of a travelling crane?

ASingle phase motor

BWard-Leonard controlled D.C. shunt motor

CSynchronous motor

DA.C. slip ring motor

Correct answer

D. A.C. slip ring motor

Explanation

The correct answer is A.C. slip ring motor.

848Electrical EngineeringMedium

If the input to an integrating circuit is a succession of alternating positive and negative pulses of very short duration, the output will be ________wave A?

ASine

BSquare

CTriangular

Correct answer

B. Square

Explanation

The correct answer is Square.

849Electrical EngineeringMedium

What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 µA of full-scale current?

ANone of the above

B200 kO

C10 kO

D20 kO

Correct answer

B. 200 kO

Explanation

The correct answer is 200 kO.

850Electrical EngineeringMedium

Tractive magnets are operated from________?

Anone of the above

Bd.c. supply

Ceither a.c. or d.c. supply

Da.c. supply

Correct answer

B. d.c. supply

Explanation

The correct answer is d.c. supply.

In reverse blocking mode of a thyristor________?

Ajunction J3 is in forward bias and J1, J2 in reverse bias.

Bjunction J1, J3 is in reverse bias and J2 is in forward bias.

Cjunction J1 and J2 is in forward bias and J3 is in reverse bias.

Djunction J2 is in reverse bias and J1, J3 is in forward bias.

Correct answer

B. junction J1, J3 is in reverse bias and J2 is in forward bias.

Explanation

The correct answer is junction J1, J3 is in reverse bias and J2 is in forward bias..

A crowbar is a circuit which is used to protect a________?

Avoltage sensitive load from excessive dc power supply output voltages

Bvoltage sensitive load from excessive ac power supply output voltages

Ccurrent sensitive load from excessive dc power supply output voltages

Dcurrent sensitive load from excessive ac power supply output voltages

Correct answer

A. voltage sensitive load from excessive dc power supply output voltages

Explanation

The correct answer is voltage sensitive load from excessive dc power supply output voltages.