3-PHASE INDUCTION MOTOR - 4

31. A pump induction motor is switchead on to a supply 30% lower than the rated voltage. The pump runs. What will eventually happen? It will __________

stall after sometime

stall immediately

continue to run at lower speed without damage

get heated and subsequently get damaged

32. A 3-phase slip ring motor has __________

double cage rot

wound rotor

short circuited rotor

any of the above

33. The torque developed in an induction motor is nearly proportional to ___________

1/V

square of V

1/square of V

34. The shape of the torque/slip curve of induction motor is __________

parabola

hyperbola

rectangular parabola

straight line

35. A change of 4% of supply voltage to an induction motor will produce a change of approximately ___________

4% in the rotor torque

8% in the rotor torque

12% in the rotor torque

16% in the rotor torque

36. The stating torque of the slip ring induction motor can be increased by adding _______

external inductance to the rotor

. external resistance to the rotor

. external capacitance to the rotor

both resistance and inductance to rotor

37. A 500 kW, 3-phase,440 volts, 50 Hz, A.C.induction rotor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be __________

0.01

0.02

0.03

0.04

38. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?

the slip of the motor will be 5%

the rotor will not run

the rotor will run at very high speed

the torque produced will be very large

39. In an induction motor if air-gap is increased _____________

power factor will be low

windage losses will be more

bearing friction will reduce

copper loss will reduce

40. In case of a double cage induction motor, the inner cage has __________

high inductance and low resistance

low inductance and high resistance

low inductance and low resistance

high inductance and high resistance

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