Different Types of Single Phase Induction Motor - MCQs with Answers

Different Types of Single Phase Induction Motor - MCQs with Answers

Q1. The spit phase induction motor has

a. Low starting current and high starting torque
b. Moderate starting current and moderate starting torque
c. Low starting current and moderate starting torque
d. Moderate starting current and low starting torque

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Q2. In washing machines, most commonly used motors are

a. Split phase induction motors
b. Slip ring induction motors
c. Capacitor start induction motors
d. Shaded pole induction motors

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Q3. Split phase induction motors are available in the range of

a. 1/2 to 1/10 kW
b. 1/20 to 1/2 kW
c. 1/10 to 1/20 kW
d. None of these

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Q4. In capacitor start capacitor run induction motor, the capacitor

a. Only at start
b. Only during running condition
c. At start as well as during running condition
d. None of these

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Q5. The capacitor connected permanently in capacitor run motor

a. Improves power factor
b. Lowers power factor
c. Does not affect power factor
d. None of these
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Q6. In refrigerators the commonly used motors are

a. Split phase induction motors
b. Capacitor induction motors
c. Shaded pole induction motors
d. None of these

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Q7. In shaded pole induction motor, the direction of rotation of magnetic field is from

a. Shaded pole to nonshaded pole
b. Nonshaded pole to shaded pole
c. Doesn't depend on the poles
d. None of these

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Q8. The starting torque and power factor of shaded pole induction motor

a. High, low
b. Low, high
c. Low, low
d. High, high

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Q9. In a single phase induction motor, the motor speed on no load is

a. Almost equal to its synchronous speed
b. Less than its synchronous speed
c. Greater than synchronous speed
d. None of these

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Q10. The torque equation of single phase induction motor contains a constant term superimposed over by a pulsating torque. The pulsating frequency is

a. Equal to the supply frequency
b. Twice of the supply frequency
c. Half of the supply frequency
d. None of these

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Q11. The stator of split phase induction motor has two windings, main winding and auxiliary winding. These windings are displaced in space by

a. 30 electrical degrees
b. 90 electrical degrees
c. 120 electrical degrees
d. 180 electrical degrees

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Q12. The flux under the unshaded pole of shaded pole induction motor

a. Is in equal phase of flux under the shaded pole
b. Lags the flux under the shaded pole
c. Leads the flux under the shaded pole
d. None of these

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Q13. A two phase servomotor is commonly used in feedback control system to drive the loads and as sensors to measure

a. Speed of controlled element
b. Position of controlled element
c. Both (a) & (b)
d. None of these

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Q14. For moment of inertia to be small in two phase servomotor, the ratio of rotor diameter to its length should be

a. Equal to 1
b. small
c. large
d. All of these

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