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 2004
MCQ (Single Correct Answer)
+1
-0.3
For a given stepper motor, the following torque has the highest numerical value.
A
Detent torque
B
Pull-in torque
C
Pull-out torque
D
Holding torque
4
GATE EE 2004
MCQ (Single Correct Answer)
+1
-0.3
The following motor definitely has a permanent magnet rotor
A
DC commutator motor
B
Brushless dc motor
C
Stepper motor
D
Reluctance motor
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