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All Electrical Engineering MCQs

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

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1761Electrical EngineeringMedium

For germanium the forbidden energy gap is________?

A0.25 eV

B0.5eV

C0.7eV

D0.15 eV

Correct answer

C. 0.7eV

Explanation

The correct answer is 0.7eV.

1762Electrical EngineeringMedium

A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil?

AωB(r2-r1)2/Δt

BωB/r22-r12/Δt

Correct answer

B. ωB/r22-r12/Δt

Explanation

The correct answer is ωB/r22-r12/Δt.

1763Electrical EngineeringMedium

In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes________?

AZero

BPositive

CNegative

DNone of these

Correct answer

B. Positive

Explanation

The correct answer is Positive.

1764Electrical EngineeringMedium

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least________?

A5 W

B75 W

C1 W

D33 W

Correct answer

C. 1 W

Explanation

The correct answer is 1 W.

1765Electrical EngineeringMedium

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is________?

Aall of the above

Bhigh starting torque

Clow windage losses

Dslop speed operation

Correct answer

B. high starting torque

Explanation

The correct answer is high starting torque.

1766Electrical EngineeringMedium

The armature core of a D.C. generator is usually made of________?

Acopper

Bcast-iron

Cnon-ferrous material

Dsilicon steel

Correct answer

D. silicon steel

Explanation

The correct answer is silicon steel.

1767Electrical EngineeringMedium

A reverse biased pn junction has resistance of the order of________?

BNone of the above

CMO

DkO

Correct answer

C. MO

Explanation

The correct answer is MO.

1768Electrical EngineeringMedium

The co-ordination number of a simple cubic structure is________?

Correct answer

D. 6

Explanation

The correct answer is 6.

1769Electrical EngineeringMedium

If the input capacitor of a transistor amplifier is short-circuited, then________?

ASignal will not reach the base

BBiasing conditions will change

CNone of the above

DTransistor will be destroyed

Correct answer

B. Biasing conditions will change

Explanation

The correct answer is Biasing conditions will change.

1770Electrical EngineeringMedium

Which of the following single-phase motors has relatively poor starting torque?

ACapacitor motor

BRepulsion motor

CUniversal motor

DAll single phase motors have zero starting torque

Correct answer

A. Capacitor motor

Explanation

The correct answer is Capacitor motor.

1761Electrical EngineeringMedium

For germanium the forbidden energy gap is________?

A0.25 eV

B0.5eV

C0.7eV

D0.15 eV

Correct answer

C. 0.7eV

Explanation

The correct answer is 0.7eV.

1762Electrical EngineeringMedium

A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil?

AωB(r2-r1)2/Δt

BωB/r22-r12/Δt

Correct answer

B. ωB/r22-r12/Δt

Explanation

The correct answer is ωB/r22-r12/Δt.

1763Electrical EngineeringMedium

In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes________?

AZero

BPositive

CNegative

DNone of these

Correct answer

B. Positive

Explanation

The correct answer is Positive.

1764Electrical EngineeringMedium

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least________?

A5 W

B75 W

C1 W

D33 W

Correct answer

C. 1 W

Explanation

The correct answer is 1 W.

1765Electrical EngineeringMedium

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is________?

Aall of the above

Bhigh starting torque

Clow windage losses

Dslop speed operation

Correct answer

B. high starting torque

Explanation

The correct answer is high starting torque.

1766Electrical EngineeringMedium

The armature core of a D.C. generator is usually made of________?

Acopper

Bcast-iron

Cnon-ferrous material

Dsilicon steel

Correct answer

D. silicon steel

Explanation

The correct answer is silicon steel.

1767Electrical EngineeringMedium

A reverse biased pn junction has resistance of the order of________?

BNone of the above

CMO

DkO

Correct answer

C. MO

Explanation

The correct answer is MO.

1768Electrical EngineeringMedium

The co-ordination number of a simple cubic structure is________?

Correct answer

D. 6

Explanation

The correct answer is 6.

1769Electrical EngineeringMedium

If the input capacitor of a transistor amplifier is short-circuited, then________?

ASignal will not reach the base

BBiasing conditions will change

CNone of the above

DTransistor will be destroyed

Correct answer

B. Biasing conditions will change

Explanation

The correct answer is Biasing conditions will change.

1770Electrical EngineeringMedium

Which of the following single-phase motors has relatively poor starting torque?

ACapacitor motor

BRepulsion motor

CUniversal motor

DAll single phase motors have zero starting torque

Correct answer

A. Capacitor motor

Explanation

The correct answer is Capacitor motor.