1
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
2
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 ____
3
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
4
GATE EE 2014 Set 1
Numerical
+1
-0
A star connected 400 V, 50 Hz, 4 pole synchronous machine gave the following open circuit and short circuit test results:
Open circuit test: VOC = 400 V (rms, line–to–line) at field current, If = 2.3 A
Short circuit test: ISC = 10 A(rms, phase) at field current, If =1.5 A
The value of per phase synchronous impedance in Ω at rated voltage is __________.
Your input ____
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