3-PHASE INDUCTION MOTOR - 5

41. The low power factor of induction motor is due to ___________

rotor leakage reactance

stator reactance

the reactive lagging magnetizing current necessary to generate the magnetic flux

all of the above

42. Less maintenance troubles are experienced in case of ____________

slip ring induction motor

squirrel cage induction motor

both a & b

none of the above

43. A squirrel cage induction motor is not selected when ____________

initial cost is the main consideration

maintenance cost is to be kept low

higher starting torque is the main consideration

all above consideration are involved

44. In a star/delta starter of an induction motor __________

resistance is inserted in the stator

reduced voltage is applied to the stator

resistance is inserted in the rotar circuit

applied voltage per stator phase is 57.7% of the line voltage

45. The rotar of an induction motor runs at __________

synchronous speed

below synchronous speed

above synchronous speed

any of the above

46. An induction motor is identical to ____________

DC compound motor

DC series motor

synchronous motor

asynchronous motor

47. The efficiency of an induction motor is _______ than that of a transformer.

lower

higher

either of the above

none of the above

48. If the rotor circuit of a squirrel cage induction motor is open, the rotor will __________

run at veryhigh speed

run at very low speed

make noise

not run

49. Out of the following methods of starting a 3-phase induction motor, which one requires six stator terminals?

direct on line

star delta

auto transformer

rotor rheostat

50. The fractional slip of an induction motor is the ratio of __________

rotor copper loss/rotor output

rotor copper loss/rotor input

rotor copper loss/stator copper loss

stator copper loss/stator input

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