Electrical Machine - II (3150910) MCQs

MCQs of Single-Phase Induction Motors

Showing 11 to 20 out of 50 Questions
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11.

_______________  motor is used in the mixer/blender.

(a)

Repulsion Motor
(b)

Shaded pole motor
(c)

Capacitor start capacitor run motor
(d)

Universal Motor
Answer:

Option (d)

12.

How we can change the direction of rotation in a split-phase single phase induction motor?

(a)

by interchanging Running winding terminal
(b)

by interchanging Starting winding terminal
(c)

by interchanging Both (Starting & Running) winding terminal
(d)

by interchanging either Starting or Running winding terminal
Answer:

Option (d)

13.

Which of the following motor has the highest starting torque?

(a)

Resistance Start motor 
(b)

Capacitor Start motor
(c)

Capacitor Run Motor
(d)

Shaded pole motor 
Answer:

Option (b)

14.

The repulsion-start induction-run motor is used because of

(a)

Low cost
(b)

Good Power factor
(c)

High efficiency
(d)

High starting torque
Answer:

Option (d)

15.

In split-phase motor, what is the role of auxiliary winding?

(a)

It is used to create stator RMF
(b)

to provide better running power factor 
(c)

to decrease harmonic
(d)

to control starting speed 
Answer:

Option (a)

16.

The main winding of Split-phase Single-Phase Induction Motor has 

(a)

High Resistance and Low Reactance 
(b)

Low Resistance and High Reactance 
(c)

High Resistance & Reactance 
(d)

Low Resistance & Reactance 
Answer:

Option (b)

17.

The auxiliary winding of Split-phase Single-Phase Induction Motor has 

(a)

High Resistance and Low Reactance 
(b)

Low Resistance and High Reactance 
(c)

High Resistance & Reactance 
(d)

Low Resistance & Reactance 
Answer:

Option (a)

18.

In split-phase motor, the auxiliary winding is made up of

(a)

Thick wire with fewer turns
(b)

Thin wire with fewer turns
(c)

Thin wire with many turns
(d)

Thick wire with many turns
Answer:

Option (b)

19.

The main winding & auxiliary winding of Split-phase Single-Phase Induction Motor have spaced ______________ apart and are connected in _______________ across the 1-Φ supply.  

(a)

90º mechanically,     parallel
(b)

90º electrically,     parallel
(c)

180º mechanically,   series
(d)

180º electrically, series
Answer:

Option (b)

20.

We connect Centrifugal switch (CS) in series with auxiliary (starting) winding to _______________ and its ____________ type switch.

(a)

connect it after the starting period,     NC
(b)

disconnect it after the starting period,     NO
(c)

connect it after the starting period,     NO
(d)

disconnect it after the starting period,     NC
Answer:

Option (d)

Showing 11 to 20 out of 50 Questions
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