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An 8-pole, 50 Hz, single phase induction motor is running at 690 rpm. It’s slip w.r.t. backward and forward fields respectively are:
Correct answer is option ''. Can you explain this answer?
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An 8-pole, 50 Hz, single phase induction motor is running at 690 rpm. ...

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An 8-pole, 50 Hz, single phase induction motor is running at 690 rpm. ...
Can be calculated that the motor has a synchronous speed of 750 rpm (120 x 50 / 8 = 750). Therefore, the motor is running at a slip of 8% (100 x (750 - 690) / 750 = 8%).

Assuming the motor is operating at its rated voltage and frequency, the actual speed of the motor can be calculated using the following formula:

Actual speed = synchronous speed x (1 - slip)

Actual speed = 750 x (1 - 0.08) = 690 rpm

Therefore, the actual speed of the motor is 690 rpm, which is the same as the given speed. This indicates that the motor is operating at its full load speed and is not overloaded or underloaded.
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