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All Electrical Engineering MCQs

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

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1321Electrical EngineeringMedium

Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be________?

ATriangular wave

BParabolic wave

CSine wave

DSquare wave

Correct answer

C. Sine wave

Explanation

The correct answer is Sine wave.

1322Electrical EngineeringMedium

A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?

DNone of the above

Correct answer

B. 6

Explanation

The correct answer is 6.

1323Electrical EngineeringMedium

Fault diverters are basically________?

Arelays

Bfast switches

Ccircuit breakers

Dfuses

Correct answer

B. fast switches

Explanation

The correct answer is fast switches.

1324Electrical EngineeringMedium

In a regenerative feed heating cycle, the greatest economy is affected________?

Awhen steam is extracted only from the last stage of steam turbine

Bwhen steam is extracted from several places in different stages of steam turbine

Cwhen steam is extracted only from the first stage of steam turbine

Dwhen steam is extracted from only one suitable point of steam turbine

Correct answer

B. when steam is extracted from several places in different stages of steam turbine

Explanation

The correct answer is when steam is extracted from several places in different stages of steam turbine.

1325Electrical EngineeringMedium

Which of the following are non-conductors of electricity?

APure water and liquids in general except mercury

BNon-metal solids except carbon

CAir and most other gases

DAll of the above

Correct answer

D. All of the above

Explanation

The correct answer is All of the above.

1326Electrical EngineeringMedium

A rheostat differs from potentiometer in the respect that it________?

Ahas large number of turns

Bhas lower wattage rating

Coffers large number of tapping

Dhas higher wattage rating

Correct answer

D. has higher wattage rating

Explanation

The correct answer is has higher wattage rating.

1327Electrical EngineeringMedium

A hole in a semiconductor is defined as________?

AThe incomplete part of an electron pair bond

BA free electron

CA free neutron

Correct answer

A. The incomplete part of an electron pair bond

Explanation

The correct answer is The incomplete part of an electron pair bond.

1328Electrical EngineeringMedium

A switch has ________?

AOne state

BThree states

CTwo states

DNone of the above

Correct answer

C. Two states

Explanation

The correct answer is Two states.

1329Electrical EngineeringMedium

A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

A999 Hz

B2,176 Hz

C4,591 Hz

D459 Hz

Correct answer

C. 4,591 Hz

Explanation

The correct answer is 4,591 Hz.

1330Electrical EngineeringMedium

The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is________?

A0.555

B0.6

C0.5457

D0.578

Correct answer

C. 0.5457

Explanation

The correct answer is 0.5457.

In a regenerative feed heating cycle, the greatest economy is affected________?

Awhen steam is extracted only from the last stage of steam turbine

Bwhen steam is extracted from several places in different stages of steam turbine

Cwhen steam is extracted only from the first stage of steam turbine

Dwhen steam is extracted from only one suitable point of steam turbine

Correct answer

B. when steam is extracted from several places in different stages of steam turbine

Explanation

The correct answer is when steam is extracted from several places in different stages of steam turbine.