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Electrical Engineering Objective Questions { Induction Motors }

71.  A squirrel cage induction motor is not selected when
A. initial cost is the main consideration
B. maintenance cost is a be kept low higher starting torque is the main consideration
C. all above consideration are involved

72.  Reduced voltage starter can be used with
A. slip ring motor only but not with squirrel cage induction motor
B. squirrel cage induction motor only but not with slip ring motor
C. squirrel cage as well as slip ring induction motor
D. none of the above

73. Slip ring motor is preferred over squirrel cage induction motor where
A. high starting torque is required
B. load torque is heavy
C. heavy pull out torque is required
D. all of the above

74. In a star-delta starter of an induction motor
A. resistance is inserted in the stator
B. reduced voltage is applied to the stator
C. resistance is inserted in the rotor circuit
D. applied voltage per stator phase is 57.7% of the line voltage

75. The torque of an induction motor is
A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above

76. The rotor of an induction motor runs at
A. synchronous speed
B. below synchronous speed
C. above synchronous speed
D. any o the above

77. The starting torque of a three phase induction motor can be increased by
A. increasing slip
B. increasing current
C. both (a) and (b)
D. none of the above

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