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All Electrical Engineering MCQs

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

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861Electrical EngineeringMedium

Regulator sampling PWM is usually used in________?

ALow power inverters

BOnly A. and B.

CHigh power inverters

DRectifiers

Correct answer

B. Only A. and B.

Explanation

The correct answer is Only A. and B..

862Electrical EngineeringMedium

What happen due to high di / dt________?

ANone of these

BInsulation failure

CLocal hot spot

DBreakdown of junction

Correct answer

C. Local hot spot

Explanation

The correct answer is Local hot spot.

863Electrical EngineeringMedium

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be________?

A38 mH

B32 mH

C48 mH

D40 mH

Correct answer

A. 38 mH

Explanation

The correct answer is 38 mH.

864Electrical EngineeringMedium

TravelUng grate stoker can burn coals at the rates of________?

A100—150 kg/m per hour

B75—100 kg/m per hour

C50—75 kg/m per hour

D150—200 kg/m2 per hour

Correct answer

D. 150—200 kg/m2 per hour

Explanation

The correct answer is 150—200 kg/m2 per hour.

865Electrical EngineeringMedium

For display of signal pattern ________voltage is applied to the horizontal plates of a CRO?

ARectangular

BSinusoidal

CSawtooth

DNone of the above

Correct answer

C. Sawtooth

Explanation

The correct answer is Sawtooth.

866Electrical EngineeringMedium

A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is________?

A680 Ω

B1,029 Ω

C880 Ω

D200 Ω

Correct answer

B. 1,029 Ω

Explanation

The correct answer is 1,029 Ω.

867Electrical EngineeringMedium

The common-mode voltage gain is________?

Aequal to differential voltage gain

Bgreater than differential voltage gain

Cnone of the above

Dsmaller than differentail voltage gain

Correct answer

D. smaller than differentail voltage gain

Explanation

The correct answer is smaller than differentail voltage gain.

868Electrical EngineeringMedium

Ripple factor is the ratio of________?

ARms value of the ac component of load voltage to the dc voltage

BPeak value of the dc component of load voltage to the ac voltage

CAverage value of the ac component of load voltage to the peak value of voltage

DAverage value of the dc component of load voltage to the ac voltage

Correct answer

A. Rms value of the ac component of load voltage to the dc voltage

Explanation

The correct answer is Rms value of the ac component of load voltage to the dc voltage.

869Electrical EngineeringMedium

A synchronous condenser is virtually which of the following?

AD.C. generator

BUnder excited synchronous motor

COver excited synchronous motor

DInduction motor

Correct answer

C. Over excited synchronous motor

Explanation

The correct answer is Over excited synchronous motor.

870Electrical EngineeringMedium

In an energy meter braking torque is produced to________?

Abrake the instrument

Bmaintain steady speed and equal to driving torque

Csafe guard it against creep

Dbring energy meter to stand still

Correct answer

B. maintain steady speed and equal to driving torque

Explanation

The correct answer is maintain steady speed and equal to driving torque.

Ripple factor is the ratio of________?

ARms value of the ac component of load voltage to the dc voltage

BPeak value of the dc component of load voltage to the ac voltage

CAverage value of the ac component of load voltage to the peak value of voltage

DAverage value of the dc component of load voltage to the ac voltage

Correct answer

A. Rms value of the ac component of load voltage to the dc voltage

Explanation

The correct answer is Rms value of the ac component of load voltage to the dc voltage.