SHORT Questions & Answers ABOUT SINGLE PHASE INDUCTION MOTOR AND SPECIAL MACHINES

1.    What is the rating of single phase machine? state its application

The rating of the single phase machine is from 1/8 to ¾ hp range. They are widely used for fancy washing machines,refridgertors,blowers etc.,

2.    How will you change the direction of rotation of split phase induction motor?

The direction  of rotation  of a spilit phase induction motor can be changed the direction of current either in starting winiding .

3.    What type of motor is used for ceiling fan?

Permanent capacitor motor is used forceiling fans.

4.    State application of shaded pole motor?

This motor is available in small sizes upto 0.05 kw.


5.    What is step angle?


6.    Why single phase motor has low power factor?

The current through the running winding lags behind the supply voltage by a very large angle.Hence the power  factor is low in single phase induction motor.

7.    What is a universal motor?

Universal motor is a series motor of rating less than 1 kw which is designed to operate on both dc and ac supply. 

8.    How is the universal motor different from dc series motor?
a.    The yoke and poles are laminated.

b.    The field is wound with lesser turns

c.    Large number of armature terms are provided.



9.    State the application of universal motor

Universal motors are widely used for food mixers, vaccum cleaners,hair driers


10.    State the application of stepper motor.

Paper feed motors in typewriters and printers,positioning of printers heads,pens of XY plotters, recording heads in computers disc drives.
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