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All Electrical Engineering MCQs

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

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2281Electrical EngineeringMedium

Which of the following statement is true________?

AA galvanometer with low resistance in series is an ammeter

BA galvanometer with high resistance in series is an ammeter

CA galvanometer with high resistance in parallel is a voltmeter

DA galvanometer with low resistance in parallel is a voltmeter

Correct answer

A. A galvanometer with low resistance in series is an ammeter

Explanation

The correct answer is A galvanometer with low resistance in series is an ammeter.

2282Electrical EngineeringMedium

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken________?

Afrom a battery

Bfrom the same source as the unknown voltage

Cfrom a source which is not the same as the unknown voltage

Dany of the above

Correct answer

B. from the same source as the unknown voltage

Explanation

The correct answer is from the same source as the unknown voltage.

2283Electrical EngineeringMedium

The channel of a JFET is between the ________?

Ainput and output

Bdrain and source

Cgate and drain

Dgate and source

Correct answer

B. drain and source

Explanation

The correct answer is drain and source.

2284Electrical EngineeringMedium

The size of poxvirus is________?

A250 nm

B300 nm

C20 nm

D200 nm

Correct answer

B. 300 nm

Explanation

The correct answer is 300 nm.

2285Electrical EngineeringMedium

Hysteresis is desirable in Schmitt-trigger, because________?

AEnergy is to be stored/discharged in parasitic capacitances

BEffects of temperature would be compensated

CIt would prevent noise from causing false triggering

DDevices in the circuit should be allowed time for saturation and desaturation

Correct answer

D. Devices in the circuit should be allowed time for saturation and desaturation

Explanation

The correct answer is Devices in the circuit should be allowed time for saturation and desaturation.

2286Electrical EngineeringMedium

Which of the following motors is used in tape-recorders ________?

AReluctance motor

BCapacitor-run motor

CHysteresis motor

DUniversal motor

Correct answer

C. Hysteresis motor

Explanation

The correct answer is Hysteresis motor.

2287Electrical EngineeringMedium

Long distance railways use which of the following?

A25 kV two phase A.C.

B25 kV three phase A.C.

C200 V D.C.

D25 kV single phase A.C.

Correct answer

D. 25 kV single phase A.C.

Explanation

The correct answer is 25 kV single phase A.C..

2288Electrical EngineeringMedium

Life of the Edison cell is at least________?

Aten years

Bfive years

Ceight years

Dseven years

Correct answer

B. five years

Explanation

The correct answer is five years.

2289Electrical EngineeringMedium

The pressure on the two sides of the impulse wheel of a steam turbine________?

Aincreases from one side to the other side

Bis same

Cdecreases from one side to the other side

Dis different

Correct answer

B. is same

Explanation

The correct answer is is same.

2290Electrical EngineeringMedium

The relative permeability of a ferromagnetic material is________?

Amore than one

Bmore than 100 or 1000

Cmore than 10

Dless than one

Correct answer

B. more than 100 or 1000

Explanation

The correct answer is more than 100 or 1000.

Which of the following statement is true________?

AA galvanometer with low resistance in series is an ammeter

BA galvanometer with high resistance in series is an ammeter

CA galvanometer with high resistance in parallel is a voltmeter

DA galvanometer with low resistance in parallel is a voltmeter

Correct answer

A. A galvanometer with low resistance in series is an ammeter

Explanation

The correct answer is A galvanometer with low resistance in series is an ammeter.

Hysteresis is desirable in Schmitt-trigger, because________?

AEnergy is to be stored/discharged in parasitic capacitances

BEffects of temperature would be compensated

CIt would prevent noise from causing false triggering

DDevices in the circuit should be allowed time for saturation and desaturation

Correct answer

D. Devices in the circuit should be allowed time for saturation and desaturation

Explanation

The correct answer is Devices in the circuit should be allowed time for saturation and desaturation.