A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?

A. high starting torque is required
B. load torque is heavy
C. heavy pull out torque is required
D. all of the above

A. silicon steel
B. cast iron
C. aluminium
D. bronze

A. supply frequency
B. supply voltage
C. copper losses in motor
D. none of the above

A. self-starting with zero torque
B. self-starting with high torque
C. self-starting with low torque
D. non-self starting

A. reduces starting torque as well as maximum torque
B. increases starting torque as well as maximum torque
C. increases starting torque but maxi-mum torque remains unchanged
D. increases starting torque but maxi-mum torque decreases

A. its power factor goes on decreasing
B. its power factor remains constant
C. its power factor goes on increasing even after full load
D. its power factor goes on increasing up to full load and then it falls again