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Single Phase Motors

Single Phase Motors
A motor gets overheated due to

All of the listed here
Overloads
Worn bearings
Dry bearings

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Single Phase Motors
For the same rating, the efficiency of a single phase induction motor is _______ that of 3-phase induction motor.

More than
The same as
Less than
None of the listed here

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Single Phase Motors
Which of the following single-phase motors has relatively poor starting torque ?

Universal motor
Capacitor motor
All single phase motors have zero starting torque
Repulsion motor

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Single Phase Motors
Reluctance motors are

Either of the listed
Doubly excited
Singly excited
None of the listed here

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

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

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Single Phase Motors
If starting winding of a single-phase induction motor is left in the circuit, it will

draw excessive current and overheat
run faster
run slower
spark at light loads

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