1
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A single-phase, 230 V, 50 Hz, 4 pole, capacitor-start induction motor has the following stand still impedances
Main winding Zm =6.0 + j4.0Ω
Auxiliary winding Za = 8.0 + j6.0Ω
The value of the starting capacitor required to produce 90° phase difference between the currents in the main and auxiliary windings will be
A
176.84 µF
B
187.24 µF
C
265.26 µF
D
280.86 µF
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A rotating electrical machine having its self-inductances of both the stator and the rotor windings, independent of the rotor position will be definitely not develop
A
starting torque
B
synchronizing torque
C
hysteresis torque
D
reluctance torque
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase Inductor Motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following statements relate to the new condition if stator resistance, leakage reactance and core loss are ignored.
P. The difference between synchronous speed and actual speed remains same
Q. The air-gap flux remains same
R. The stator current remains same
S. The p.u. slip remains same
Among the above, correct statements are
A
All
B
P, Q and R
C
Q, R and S
D
P and S
4
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A single phase induction motor with only the main winding excited would exhibit the following response at synchronous speed
A
Rotor current is zero
B
Rotor current is non-zero and is at slip frequency
C
Forward and backward rotating fields are equal
D
Forward rotating field is more than the backward rotating field
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