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All Electrical Engineering MCQs

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

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1751Electrical EngineeringMedium

The steam engine provided on steam locomotives is________?

Adouble acting non-condensing type

Bsingle acting condensing type

Cdouble acting condensing type

Dsingle acting non-condensing type

Correct answer

D. single acting non-condensing type

Explanation

The correct answer is single acting non-condensing type.

1752Electrical EngineeringMedium

Edward’s air pump________?

Aremoves only air from condenser

Bremoves air and also vapour from condenser

Cremoves only un-condensed vapour from condenser

Dremoves air alongwith vapour and also the condensed water from condenser

Correct answer

D. removes air alongwith vapour and also the condensed water from condenser

Explanation

The correct answer is removes air alongwith vapour and also the condensed water from condenser.

1753Electrical EngineeringMedium

Demand factor is defined as________?

Aaverage load x maximum load

Baverage load/maximum load.

Cconnected load/maximum demand.

Dmaximum demand/connected load

Correct answer

D. maximum demand/connected load

Explanation

The correct answer is maximum demand/connected load.

1754Electrical EngineeringMedium

If the load on a DC shunt motor is increases, its speed is slightly reduced due to________?

Adecrease in back emf

Bincrease in flux

Cdecrease in reactance

Dincrease in armature current

Correct answer

A. decrease in back emf

Explanation

The correct answer is decrease in back emf.

1755Electrical EngineeringMedium

The ratio of intensity of magnetisation to the magnetisation force is known as________?

Anone of the above

Bsusceptibility

Crelative permeability

Dflux density

Correct answer

B. susceptibility

Explanation

The correct answer is susceptibility.

1756Electrical EngineeringMedium

A MOSFET differs from a JFET mainly because ________?

Athe MOSFET has two gates

Bthe JFET has a pn junction

Cof power rating

Dnone of the above

Correct answer

B. the JFET has a pn junction

Explanation

The correct answer is the JFET has a pn junction.

1757Electrical EngineeringMedium

The resistance of a few meters of wire conductor in closed electrical circuit is________?

Alow

Bvery high

Chigh

Dpractically zero

Correct answer

D. practically zero

Explanation

The correct answer is practically zero.

1758Electrical EngineeringMedium

In heating the ferromagnetic material by induction heating, heat is produced due to________?

Ahysteresis loss taking place below curie temperature

Binduced current flow through the charge

Cdue to hysteresis loss as well as eddy current loss takingplace in the charge

Dnone of the above factors

Correct answer

C. due to hysteresis loss as well as eddy current loss takingplace in the charge

Explanation

The correct answer is due to hysteresis loss as well as eddy current loss takingplace in the charge.

1759Electrical EngineeringMedium

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor?

AStator winding to earthed frame

BRotor winding to earthed shaft

CAll of the above

DPhase to phase winding resistance

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

1760Electrical EngineeringMedium

need frequent starting and stopping of electric motors?

AAir-conditioners

BLifts and hoists

CGrinding mills

DPaper mills

Correct answer

B. Lifts and hoists

Explanation

The correct answer is Lifts and hoists.

Edward’s air pump________?

Aremoves only air from condenser

Bremoves air and also vapour from condenser

Cremoves only un-condensed vapour from condenser

Dremoves air alongwith vapour and also the condensed water from condenser

Correct answer

D. removes air alongwith vapour and also the condensed water from condenser

Explanation

The correct answer is removes air alongwith vapour and also the condensed water from condenser.

In heating the ferromagnetic material by induction heating, heat is produced due to________?

Ahysteresis loss taking place below curie temperature

Binduced current flow through the charge

Cdue to hysteresis loss as well as eddy current loss takingplace in the charge

Dnone of the above factors

Correct answer

C. due to hysteresis loss as well as eddy current loss takingplace in the charge

Explanation

The correct answer is due to hysteresis loss as well as eddy current loss takingplace in the charge.