Single Phase Synchronous Motor MCQs|Assistant Electrical Inspector,AE, Electrician

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Single Phase Synchronous Motor MCQs: In this post, you can learn and practice objective Questions and answers on Single Phase Synchronous Motor, Hysterisis Motor, and Reluctance motor. Useful for competitive Exams of electrical Engineering Topics, Assistant Engineer Electrical, AE, JE, Electrician, Polytechnic Lecturer etc.

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Single Phase Synchronous Motor MCQs

1 A single-phase stator winding when excited with ac voltage produces
(a) a single rotating field rotating at synchronous speed
(b) two rotating fields rotating at synchronous speed in opposite directions
(c) two rotating fields rotating in the same direction but at different speeds
(d) two rotating fields rotating in opposite directions but with different speeds


2. A single-winding single-phase motor has


(a) low starting torque

(b) zero starting torque
(c) high starting torque

(d) starting torque equal to full-load torque

3 A single-phase self-starting motor has two stator windings


(a) placed at 180° elect and fed with out-of-phase voltages
(b) placed at 90° elect and fed with in-phase voltages
(c) placed at 45° elect and fed with out-of-phase voltages
(d) placed at 90° elect and fed with out-of-phase voltages

4 Phase splitting can be accomplished in a single-phase induction motor


(a) only by adding a capacitor in series with the auxiliary winding
(b) only by causing the auxiliary winding to have high resistance
(c) only by causing the auxiliary winding to have very high resistance
(d) by any of the above these methods

5 A capacitor start single-phase motor is used


(a) for easy to start loads

(b) for medium start loads
(c) for hard to start loads

(d) for any type of start loads

6 A shaded-pole motor runs in


(a) the dissection from the shaded to unshaded part of the poles
(b) the direction from the unshaded to shaded part of the poles
(c) any direction depending on the polarity of the applied voltage
(d) none of the above

7 Compared to a capacitor-start motor, a two-value capacitor motor has


(a) nearly the same starting torque but better running power factor
(b) higher starting and higher running power factor
(c) higher starting torque but lower running power factor
(d) lower starting torque but higher running power factor

8 A single-phase reluctance motor


(a) has zero starting torque as it is a synchronous motor
(b) starts as an induction motor but runs as a synchronous motor
(c) starts as a hysteresis motor but runs as a synchronous motor
(d) starts as an induction motor and runs as an induction motor

9 A single-phase hysteresis motor


(a) can run at synchronous speed
(b) can run at subsynchronous speed only
(c) can run at synchronous and super synchronous speed
(d) can run at synchronous and subsynchronous speed

Answers

  1. (b) 2. (b) 3. (d) 4. (d) 5. (c) (b) 7. (a) 8. (b) 9. (d)

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