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Single Phase Motors

Single Phase Motors
The full load efficiency of a shaded pole motor is about _______

5 to 10%
30 to 35%
70 to 80%
60 to 70%

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Single Phase Motors
The speed control of universal motor used for sewing machines is by

Friction
Centrifugal mechanism
Varying the resistance
Tapping the field

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Single Phase Motors
The resistance split phase induction motor is used in those application where ______

Starting period is long
Starting is frequent
Starting is infrequent
None of the listed here

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Single Phase Motors
A scharge motor can run on

Negative slip
All of the listed here
Positive slip
Zero slip

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Single Phase Motors
Which of the following motors can be used for unity power factor ?

Shaded pole motor
Schrage motor
Capacitor run motor
Hysteresis motor

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Single Phase Motors
Which motor is normally free from mechanical and magnetic vibrations?

Shaded pole motor
Universal motor
Split phase motor
Hysteresis motor

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