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
Answer: Option D
This Question Belongs to Electrical Engineering >> Polyphase Induction Motors
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Which is of the following data is required to draw the circle diagram for an induction motor?
A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test
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
Rotor rheostat control method of speed control is used for
A. Squirrel-cage induction motors only
B. Slip ring induction motors only
C. Both (A) and (B)
D. None of the above
As voltage is reduced, so to maintain constant power it will draw more current which will burn its armature.