1
GATE EE 2018
MCQ (Single Correct Answer)
+1
-0.3
In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is
A
0
B
45
C
60
D
90
2
GATE EE 2017 Set 2
MCQ (Single Correct Answer)
+1
-0.3
If a synchronous motor is running at a leading power factor, its excitation induced voltage (Er) is
A
equal to terminal voltage Vt
B
higher than the terminal voltage Vt
C
less than terminal voltage Vt
D
dependent upon supply voltage Vt
3
GATE EE 2017 Set 1
Numerical
+1
-0
A three-phase, 50Hz, star-connected cylindrical-rotor synchronous machine is running as a motor. The machine is operated from a 6.6 kV grid and draws current at unity power factor (UPF). The synchronous reactance of the motor is 30 Ω per phase. The load angle is $$30^\circ$$. The power delivered to the motor in kW is _______.
Your input ____
4
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+1
-0.3
In a synchronous machine, hunting is predominantly damped by
A
mechanical losses in the rotor
B
iron losses in the rotor
C
copper losses in the stator
D
copper losses in the rotor
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