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Polyphase Induction Motors - Interview Questions and Answers

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61. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
A. in the opposite direction as the direction of the rotating field
B. in the same direction as the direction of the field
C. in any direction depending upon phase squence of supply
D. in the same direction as the direction of the field
Explanation:
62. A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will
A. stall after sometime
B. stall immediately
C. continue to run at lower speed without damage
D. get heated and subsequently get damaged
Explanation:
63. The complete circle diagram of induetion motor can be drawn with the help of data found from
A. noload test
B. blocked rotor test
C. stator resistance test
D. all of the above
Explanation:
64. The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines
A. D.C. series motor
B. D.C. shunt motor
C. universal motor
D. none of the above
Explanation:
65. In the squirrel-cage induction motor the rotor slots are usually given slight skew
A. to reduce the magnetic hum and locking tendency of the rotor
B. to increase the tensile strength of the rotor bars
C. to ensure easy fabrication
D. none of the above
Explanation:
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