1
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
The power input to a 415 V, 50 Hz, 6 pole, 3-phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses total 2 kW. The efficiency of the motor is
A
92.5%
B
90%
C
91%
D
88%
2
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A three phase, wound rotor induction motor is to be operated with slip energy recovery in the constant torque mode, when it delivers an output power P0 at slop 's'. then theoretically, the maximum power that is available for recovery at the rotor terminals, is equal to
A
P0
B
P0.s
C
$$\frac{P_0}{\left(1-s\right)}$$
D
$$\frac{P_0S}{\left(1-s\right)}$$
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