1.  Calculate No of poles for 60 Hz, 3 Phase, 1750 rpm Induction Motor.                   2 pole                 3 pole                 4 pole                 5 pole

2.   In the induction motor, induced torque at synchronous speed is :   maximum minimum zero average

3.  The starting torque of the induction motor is :   slightly larger then its full load torque smaller then its full load torque equal to its full load torque much higher then its full load torque

4.   The torque on the induction motor for a given slip :   varies as the half of the applied voltage equal to applied voltage varies as the square of the applied voltage do not change with applied voltage

5.  If the rotor of the Induction Motor turns at 1750 rpm and the synchronous speed is                 1800 rpm, calculate slip.             2.78             2.68             2.58             2.48

6.   Induction motor is in the no load condition, that means              N = 0 and S = 1             N = Ns and S = 1             N = Ns and S = 0             N = 0 and S = 0

7.   The speed control of the induction motor can not be accomplished by :   changing the number of poles on the machine changing the applied electrical frequency changing the load changing the applied terminal voltage

 

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