SSC JE Electrical 2019 with solution SET-1
A three-phase induction machine, when it is operating like a motor, the range of slip is given by

1 < a < 2
−1 > s > −2
0 ≤ s ≤ 1
0 > s > −1

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SSC JE Electrical 2019 with solution SET-1
If the field of the synchronous motor is under excited the power factor will be:

Unity
Zero
Leading
Lagging

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SSC JE Electrical 2019 with solution SET-1
 What is the reason behind using a centrifugal switch in a single-phase induction motor?

To protect the motor from overloading
To improve the starting performance of the motor
To out in the capacitor during running conditions
To cut-off the starting winding at an appropriate instant

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