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All Electrical Engineering MCQs

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

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2031Electrical EngineeringMedium

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor________?

ANone of the above

BRemains the same

CIncreases

DDecreases

Correct answer

D. Decreases

Explanation

The correct answer is Decreases.

2032Electrical EngineeringMedium

In a full wave rectifier, the rectification ratio is approximately equal to________?

A81%

B71%

C61%

D91%

Correct answer

A. 81%

Explanation

The correct answer is 81%.

2033Electrical EngineeringMedium

For both lap and wave windings, there are as many commutator bars as the number of________?

Aslots

Bpoles

Carmature conductors

Dwinding elements

Correct answer

D. winding elements

Explanation

The correct answer is winding elements.

2034Electrical EngineeringMedium

relays are used for phase faults on long line?

AEither of the above

BNone of the above

CImpedance

DReactance

Correct answer

C. Impedance

Explanation

The correct answer is Impedance.

2035Electrical EngineeringMedium

A D.C. welding generator has________?

Alap winding

Bduplex winding

Cany of the above

Dwave moving

Correct answer

A. lap winding

Explanation

The correct answer is lap winding.

2036Electrical EngineeringMedium

There is a greater possibility of occurence of corona during________?

Awinter

Bnone of the above

Chumid weather

Dsummer heat

Edry weather

Correct answer

C. humid weather

Explanation

The correct answer is humid weather.

2037Electrical EngineeringMedium

A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?

A6 kO

B3 kO

CkO

Correct answer

B. 3 kO

Explanation

The correct answer is 3 kO.

2038Electrical EngineeringMedium

In a Weston synchronoscope, the fixed coils are connected across________?

Aincoming alternator

Bnone of the above

Ca lamp

Dbus-bars

Correct answer

A. incoming alternator

Explanation

The correct answer is incoming alternator.

2039Electrical EngineeringMedium

When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when________?

Anone of the above

Bdegree of curvature is more

Cwheel base of axles is more

Dboth A. and B.

Correct answer

D. both A. and B.

Explanation

The correct answer is both A. and B..

2040Electrical EngineeringMedium

In aluminium conductors, steel core is provided to________?

Aneutralise proximity effect

Bincrease the tensile strength

Ccompensate for skin effect

Dreduce line inductance

Correct answer

B. increase the tensile strength

Explanation

The correct answer is increase the tensile strength.

2031Electrical EngineeringMedium

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor________?

ANone of the above

BRemains the same

CIncreases

DDecreases

Correct answer

D. Decreases

Explanation

The correct answer is Decreases.

2032Electrical EngineeringMedium

In a full wave rectifier, the rectification ratio is approximately equal to________?

A81%

B71%

C61%

D91%

Correct answer

A. 81%

Explanation

The correct answer is 81%.

2033Electrical EngineeringMedium

For both lap and wave windings, there are as many commutator bars as the number of________?

Aslots

Bpoles

Carmature conductors

Dwinding elements

Correct answer

D. winding elements

Explanation

The correct answer is winding elements.

2034Electrical EngineeringMedium

relays are used for phase faults on long line?

AEither of the above

BNone of the above

CImpedance

DReactance

Correct answer

C. Impedance

Explanation

The correct answer is Impedance.

2035Electrical EngineeringMedium

A D.C. welding generator has________?

Alap winding

Bduplex winding

Cany of the above

Dwave moving

Correct answer

A. lap winding

Explanation

The correct answer is lap winding.

2036Electrical EngineeringMedium

There is a greater possibility of occurence of corona during________?

Awinter

Bnone of the above

Chumid weather

Dsummer heat

Edry weather

Correct answer

C. humid weather

Explanation

The correct answer is humid weather.

2037Electrical EngineeringMedium

A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?

A6 kO

B3 kO

CkO

Correct answer

B. 3 kO

Explanation

The correct answer is 3 kO.

2038Electrical EngineeringMedium

In a Weston synchronoscope, the fixed coils are connected across________?

Aincoming alternator

Bnone of the above

Ca lamp

Dbus-bars

Correct answer

A. incoming alternator

Explanation

The correct answer is incoming alternator.

2039Electrical EngineeringMedium

When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when________?

Anone of the above

Bdegree of curvature is more

Cwheel base of axles is more

Dboth A. and B.

Correct answer

D. both A. and B.

Explanation

The correct answer is both A. and B..

2040Electrical EngineeringMedium

In aluminium conductors, steel core is provided to________?

Aneutralise proximity effect

Bincrease the tensile strength

Ccompensate for skin effect

Dreduce line inductance

Correct answer

B. increase the tensile strength

Explanation

The correct answer is increase the tensile strength.