Design of AC Machines (2170909) MCQs

MCQs of Design of Single-Phase Induction Motors

Showing 11 to 20 out of 56 Questions
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11.

In single-phase induction motor.  What is the shaded pole starting method?

(a)

part of the pole is shaded by open-circuited copper ring
(b)

part of the pole is shaded by a short-circuited copper ring
(c)

the pole is shaded by an open-circuited copper ring
(d)

the pole is shaded by a short circuited copper ring
Answer:

Option (b)

12.

In shaded pole single-phase induction motor. Share of Unshaded and shaded part in the pole is __________ & _________ respectively.

(a)

1/2  &  1/2
(b)

1/3  &  2/3
(c)

2/3  &  1/3 
(d)

2/5  &  3/5
Answer:

Option (c)

13.

In shaded pole single-phase induction motor. The displacement between the unshaded and shaded portion varies between _________.

(a)

5°-10°
(b)

10°-20°
(c)

20°-30°
(d)

35°-55°
Answer:

Option (c)

14.

A shaded pole single-phase induction motor is having output ratting upto  ___________ . 

(a)

25 watt
(b)

50 watt
(c)

100 watt
(d)

250 watt
Answer:

Option (b)

15.

A repulsion single-phase induction motor is used when 

(a)

low starting torque is required
(b)

high starting torque is required
(c)

high running torque is required
(d)

low running torque is required
Answer:

Option (b)

16.

A repulsion single-phase induction motor has _____________ winding instead of cage winding.

(a)

armature windings
(b)

field windings
(c)

commutator windings
(d)

slip ring winding
Answer:

Option (c)

17.

What happens in the repulsion motor starting method?

(a)

the cage windings is dominant
(b)

the commutator windings are dominant
(c)

the rotor windings are dominant
(d)

the stator windings are dominant
Answer:

Option (b)

18.

Which of the following single-phase induction motor provides highest starting torque?

(a)

Resistance split phase 
(b)

Capacitor start 
(c)

capacitor run 
(d)

shaded pole
Answer:

Option (b)

19.

In Resistance split single-phase induction motor. The phase displacement between the running and starting windings current is __________ .

(a)

20°-30°
(b)

30°-40°
(c)

50°-70°
(d)

60°-80°
Answer:

Option (b)

20.

In a capacitor, split single-phase induction motor. The phase displacement between the running and starting windings current is __________ .

(a)

20°-30°
(b)

30°-40°
(c)

50°-70°
(d)

60°-80°
Answer:

Option (d)

Showing 11 to 20 out of 56 Questions
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