Multiply Choice Questions on Single-Phase Induction motor

 

1. How many steps are involved in the construction of single phase induction motor?

A) 1
B) 3
C) 5
D) 7

ANSWER= (C) 5
Explanation:- There are 5 steps in order to construct a single phase induction motor and those are stator, stator windings, rotor, starting switches, electrolytic capacitor.

 

2. What type of coils are used for winding the single phase induction motor generally?

A) Rectangular coils
B) Square coils
C) Cruciform coils
D) Circular coils

ANSWER= (D) Circular coils
Explanation:- The single phase induction motors are generally wound with concentric coils.

 

3. How many kinds of single phase windings are present?

A) 1
B) 2
C) 3
D) 4

ANSWER= (C) 3
Explanation:- Concentric, Progressive and Skein.

 

4. How many kinds of single phase windings are present?

A) Universal motor
B) Capacitor start motor
C) Shaded pole motor
D) All have zero starting torque.

ANSWER= (B) Capacitor start motor.

 

5. Under normal operating conditions which motor can run at 5000 rpm ?

A) Synchronous motor
B) Induction motor
C) Universal motor
D) None of the above.

ANSWER= (C) Universal motor.  

 

6. The motor used in household refrigerators is

A) DC series motor.
B) DC shunt motor.
C) Universal motor.
D) Single phase Induction motor.

ANSWER= (D) Single phase Induction motor.

 

7. Single phase motors are commercially manufactured up to

A) 1 h.p.
B) 2 h.p.
C) 5 h.p.
D) 7.2 h.p.

ANSWER= (B) 2 h.p.

 

8. The direction of rotation of universal motor can be reversed by

A) reversing the supply terminals
B) switching over from ac to dc
C) interchanging the brush leads
D) all of the above

ANSWER= (C) interchanging the brush leads

 

9. For ceiling fans generally the single phase motor used is

A) Split phase type
B) Capacitor start type
C) Capacitor start and run type
D) Permanent capacitor type

ANSWER= (D) Permanent capacitor type.  

 

10. A motor generally used in toys is

A) Hysteresis motor
B) Shaded pole motor
C) Two value capacitor motor
D) Reluctance motor

ANSWER= (B) Shaded pole motor.