1
GATE EE 2021
MCQ (Single Correct Answer)
+1
-0.33
$$ \text { Consider the table given : } $$
| Constructional feature | Machine type | Mitigation |
| P. Damper bars | S. Induction motor | X. Hunting |
| Q. Skewed rotor slots | T. Transformer | Y. Magnetic locking |
| R. Compensating winding | U. Synchronous machine | Z. Armature reaction |
| V. DC machine |
The correct combination that relates the constructional feature, machine type and mitigation is
2
GATE EE 2021
Numerical
+1
-0
The power input to a $500 \mathrm{~V}, 50 \mathrm{~Hz}, 6$ pole, 3 phase induction motor running at 975 rpm is 40 kW . The stator losses are 1 kW . If the total friction and windage losses are 2.025 kW , then the efficiency is
$\_\_\_\_$ $\%$.
Your input ____
3
GATE EE 2017 Set 2
MCQ (Single Correct Answer)
+1
-0.3
A 3-phase, 4-pole, 400 V, 50 Hz squirrel-cage induction motor is operating at a slip of 0.02. The
speed of the rotor flux in mechanical rad/sec, sensed by a stationary observer, is closest to
4
GATE EE 2017 Set 1
MCQ (Single Correct Answer)
+1
-0.3
A 4 pole induction machine is working as an induction generator. The generator supply
frequency is 60 Hz. The rotor current frequency is 5 Hz. The mechanical speed of the rotor in
RPM is
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Electric Circuits
Electrical Machines
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