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All Electrical Engineering MCQs

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3551Electrical EngineeringMedium

When earth fault occurs________?

Avoltage potential at the earth mat remains zero irrespective of fault

Bvoltage potential at the earth mat increases due to grounding

Cvoltage potential at the earth mat decreases due to grounding

Dnone of the above

Correct answer

B. voltage potential at the earth mat increases due to grounding

Explanation

The correct answer is voltage potential at the earth mat increases due to grounding.

3552Electrical EngineeringMedium

In squirrel cage induction motors which of the following methods of starting cannot be used?

AResistance in stator circuit

BResistance in rotor circuit

CStar-delta starting

DAuto-transformer starting

Correct answer

B. Resistance in rotor circuit

Explanation

The correct answer is Resistance in rotor circuit.

3553Electrical EngineeringMedium

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a ________?

Aany of the above

Bthree-phase winding

Csingle-phase winding

Dtwo-phase winding

Correct answer

D. two-phase winding

Explanation

The correct answer is two-phase winding.

3554Electrical EngineeringMedium

If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?

Adecreases

Bincreases

Cremains the same

Dcannot tell

Correct answer

A. decreases

Explanation

The correct answer is decreases.

3555Electrical EngineeringMedium

________ has the best damping properties?

AMild steel

BHigh speed steel

CCast iron

DDiamond

Correct answer

C. Cast iron

Explanation

The correct answer is Cast iron.

3556Electrical EngineeringMedium

A feedback circuit usually employs ________ network?

AInductive

BResistive

CNone of the above

DCapacitive

Correct answer

B. Resistive

Explanation

The correct answer is Resistive.

3557Electrical EngineeringMedium

The material for commutator brushes is generally________?

Acopper

Bcarbon

Ccast iron

Dmica

Correct answer

B. carbon

Explanation

The correct answer is carbon.

3558Electrical EngineeringMedium

Reheat factor is the ratio of________?

Aadiabatic heat drop to isentropic heat drop

Bcumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

Cisentropic heat drop to useful heat drop

Correct answer

B. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

Explanation

The correct answer is cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop.

3559Electrical EngineeringMedium

The collector of a transistor is________doped?

Aheavily

Blightly

Cmoderately

Dnone of the above

Correct answer

C. moderately

Explanation

The correct answer is moderately.

3560Electrical EngineeringMedium

In pakistan, ________ modulation is used for radio transmission?

AFrequency

BPhase

CAmplitude

DNone of the above

Correct answer

C. Amplitude

Explanation

The correct answer is Amplitude.

When earth fault occurs________?

Avoltage potential at the earth mat remains zero irrespective of fault

Bvoltage potential at the earth mat increases due to grounding

Cvoltage potential at the earth mat decreases due to grounding

Dnone of the above

Correct answer

B. voltage potential at the earth mat increases due to grounding

Explanation

The correct answer is voltage potential at the earth mat increases due to grounding.

Reheat factor is the ratio of________?

Aadiabatic heat drop to isentropic heat drop

Bcumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

Cisentropic heat drop to useful heat drop

Correct answer

B. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

Explanation

The correct answer is cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop.