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Single Phase Induction Motors

Study 110 Electrical Engineering MCQs with correct answers and explanations.

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91Electrical EngineeringMedium

The capacitors used in single-phase capacitor motors have no________?

Apolarity marking

Bdielectric medium

Cdefinite value

Dvoltage rating

Correct answer

A. polarity marking

Explanation

The correct answer is polarity marking.

92Electrical EngineeringMedium

Which of the following motors has two separate windings on the motor?

ANone of the above

BRepulsion induction motor

CRepulsion motor

DRepulsion start induction run motor

Correct answer

B. Repulsion induction motor

Explanation

The correct answer is Repulsion induction motor.

93Electrical EngineeringMedium

The range of efficiency for shaded pole motors is________?

A95% to 99%

B50% to 75%

C80% to 90%

D5% to 35%

Correct answer

D. 5% to 35%

Explanation

The correct answer is 5% to 35%.

94Electrical EngineeringMedium

The speed/load characteristics of a universal motor is same as that of________?

Anone of the above

BD.C. shunt motor

CD.C. series motor

DA.C. motor

Correct answer

C. D.C. series motor

Explanation

The correct answer is D.C. series motor.

95Electrical EngineeringMedium

A reluctance motor________?

Ais self-starting

Ball of the above

Cis constant speed motor

Dneeds no D.C. excitation

Correct answer

B. all of the above

Explanation

The correct answer is all of the above.

96Electrical EngineeringMedium

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for________?

Afans

Bblowers

Cmixer grinders

Dsound equipment

Correct answer

D. sound equipment

Explanation

The correct answer is sound equipment.

97Electrical EngineeringMedium

If the capacitor of a single-phase motor is short-circuited________?

Athe motor will run

Bthe motor will run in reverse direction

Cthe motor will run in the same direction at reduced r.p.m

Dthe motor will not start

Correct answer

D. the motor will not start

Explanation

The correct answer is the motor will not start.

98Electrical EngineeringMedium

Which of the following motor will give the highest starting torque?

AD.C. shunt motor

BSchrage motor

CUniversal motor

DRepulsion start and induction run motor

Correct answer

B. Schrage motor

Explanation

The correct answer is Schrage motor.

99Electrical EngineeringMedium

In which single-phase motor, the rotor has no teeth or winding?

AReluctance motor

BSplit phase motor

CUniversal motor

DHysteresis motor

Correct answer

D. Hysteresis motor

Explanation

The correct answer is Hysteresis motor.

100Electrical EngineeringMedium

In a split phase motor, the running winding should have?

Alow resistance as well as low inductiance

Bhigh resistance and low inductance

Clow resistance and high inductance

Dhigh resistance as well as high inductance

Correct answer

C. low resistance and high inductance

Explanation

The correct answer is low resistance and high inductance.

91Electrical EngineeringMedium

The capacitors used in single-phase capacitor motors have no________?

Apolarity marking

Bdielectric medium

Cdefinite value

Dvoltage rating

Correct answer

A. polarity marking

Explanation

The correct answer is polarity marking.

92Electrical EngineeringMedium

Which of the following motors has two separate windings on the motor?

ANone of the above

BRepulsion induction motor

CRepulsion motor

DRepulsion start induction run motor

Correct answer

B. Repulsion induction motor

Explanation

The correct answer is Repulsion induction motor.

93Electrical EngineeringMedium

The range of efficiency for shaded pole motors is________?

A95% to 99%

B50% to 75%

C80% to 90%

D5% to 35%

Correct answer

D. 5% to 35%

Explanation

The correct answer is 5% to 35%.

94Electrical EngineeringMedium

The speed/load characteristics of a universal motor is same as that of________?

Anone of the above

BD.C. shunt motor

CD.C. series motor

DA.C. motor

Correct answer

C. D.C. series motor

Explanation

The correct answer is D.C. series motor.

95Electrical EngineeringMedium

A reluctance motor________?

Ais self-starting

Ball of the above

Cis constant speed motor

Dneeds no D.C. excitation

Correct answer

B. all of the above

Explanation

The correct answer is all of the above.

96Electrical EngineeringMedium

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for________?

Afans

Bblowers

Cmixer grinders

Dsound equipment

Correct answer

D. sound equipment

Explanation

The correct answer is sound equipment.

97Electrical EngineeringMedium

If the capacitor of a single-phase motor is short-circuited________?

Athe motor will run

Bthe motor will run in reverse direction

Cthe motor will run in the same direction at reduced r.p.m

Dthe motor will not start

Correct answer

D. the motor will not start

Explanation

The correct answer is the motor will not start.

98Electrical EngineeringMedium

Which of the following motor will give the highest starting torque?

AD.C. shunt motor

BSchrage motor

CUniversal motor

DRepulsion start and induction run motor

Correct answer

B. Schrage motor

Explanation

The correct answer is Schrage motor.

99Electrical EngineeringMedium

In which single-phase motor, the rotor has no teeth or winding?

AReluctance motor

BSplit phase motor

CUniversal motor

DHysteresis motor

Correct answer

D. Hysteresis motor

Explanation

The correct answer is Hysteresis motor.

100Electrical EngineeringMedium

In a split phase motor, the running winding should have?

Alow resistance as well as low inductiance

Bhigh resistance and low inductance

Clow resistance and high inductance

Dhigh resistance as well as high inductance

Correct answer

C. low resistance and high inductance

Explanation

The correct answer is low resistance and high inductance.