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All Electrical Engineering MCQs

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

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3341Electrical EngineeringMedium

Armature reaction of an unsaturated D.C. machine is________?

Acrossmagnetising

Bdemagnetising

Cnone of above

Dmagnetising

Correct answer

A. crossmagnetising

Explanation

The correct answer is crossmagnetising.

3342Electrical EngineeringMedium

In the case of lap winding resultant pitch is________?

Asum of front and back pitches

Bdivision of front pitch by back pitch

Cmultiplication of front and back pitches

Ddifference of front and back pitches

Correct answer

D. difference of front and back pitches

Explanation

The correct answer is difference of front and back pitches.

3343Electrical EngineeringMedium

An ideal transformer will have maximum efficiency at a load such that?

Anone of the above

Bcopper loss = iron loss

Correct answer

B. copper loss = iron loss

Explanation

The correct answer is copper loss = iron loss.

3344Electrical EngineeringMedium

In electrical-pneumatic system analogy the current is considered analogous to________?

Aair flow rate

Bair flow

Cpressure

Dvelocity

Correct answer

A. air flow rate

Explanation

The correct answer is air flow rate.

3345Electrical EngineeringMedium

Synchronsizing power of a synchronous machine is________?

Ainversely proportional to the synchronous reactance

Bequal to the synchronous reactance

Cdirecly proportional to the synchronous reactance

Dnone of the above

Correct answer

A. inversely proportional to the synchronous reactance

Explanation

The correct answer is inversely proportional to the synchronous reactance.

3346Electrical EngineeringMedium

The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is________?

Apositive

Babout 2 ohms per degree

Czero

Dnegative

Correct answer

A. positive

Explanation

The correct answer is positive.

3347Electrical EngineeringMedium

A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be________?

A90

B80

C70

D60

Correct answer

B. 80

Explanation

The correct answer is 80.

3348Electrical EngineeringMedium

Form Factor is the ratio of________?

Aaverage value/peak value

Baverage value/r.m.s. value

Cr.m.s. value/peak value

Dr.m.s. value/average value

Correct answer

D. r.m.s. value/average value

Explanation

The correct answer is r.m.s. value/average value.

3349Electrical EngineeringMedium

The design of mechanical parts is particularly important in case of ________ speed machines?

Amedium

Blow

Cany of the above

Dhigh

Correct answer

D. high

Explanation

The correct answer is high.

3350Electrical EngineeringMedium

An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit’s critical frequency is________?

A1,250 Hz

B125 Hz

C564 Hz

D5,644 Hz

Correct answer

B. 125 Hz

Explanation

The correct answer is 125 Hz.

Synchronsizing power of a synchronous machine is________?

Ainversely proportional to the synchronous reactance

Bequal to the synchronous reactance

Cdirecly proportional to the synchronous reactance

Dnone of the above

Correct answer

A. inversely proportional to the synchronous reactance

Explanation

The correct answer is inversely proportional to the synchronous reactance.