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Question

# A 6 pole, 50 Hz, 3-phase induction motor has blocked rotor reactance per phase equal to four times of the rotor resistance per phase. Which of the given statements is not correct?

A
At maximum torque condition, the value of speed of rotor is 750 rpm.
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B
The value of slip at maximum torque is 14
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C
The value of synchronous speed is 900 rpm.
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D
The value of synchronous speed is dependent on number of poles.
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Solution

## The correct option is C The value of synchronous speed is 900 rpm.For maximum torque (Tmax) Smax,T=R2X2 Smax,T=14 Synchronous speed, Ns=120×506=1000 rpm Now at Tmax speed of motor, Nr=(1−s)Ns =(1−0.25)×1000 Nr=750 rpm

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