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Polyphase Induction Motors - Interview Questions and Answers

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81. The torque developed by a 3-phase induction motor least depends on
A. rotor current
B. rotor power factor
C. rotor e.m.f.
D. shaft diameter
Explanation:
82. Which motor is preferred for use in mines where explosive gases exist ?
A. Air motor
B. Induction motor
C. D.C. shunt motor
D. Synchronous motor
Explanation:
83. Temperature of the stator winding of a three phase induction motor is obtained by
A. resistance rise method
B. thermometer method
C. embedded temperature method
D. all above methods
Explanation:
84. For driving high inertia loods best type of induction motor suggested is
A. slip ring type
B. squirrel cage type
C. any of the above
D. none of the above
Explanation:
85. When /?2 is tne rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condi-tions will be
A. sR2X2 = 1 (b) sR2 = X2
B. R2 = sX2 id) R2 = s2X2
C. R2 = sX2 id) R2 = s2X2
D. In case of a double cage induction motor, the inner cage has
Explanation:
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