1
GATE EE 2002
MCQ (Single Correct Answer)
+2
-0.6
The flux per pole in a synchronous motor with the field circuit ON and the stator disconnected from the supply is found to be $$25$$ $$mWb.$$ When the stator is connected to the rated supply with the field excitation unchanged, the flux per pole in the achine is found to be $$20$$ $$mWb$$ while the motor is running on no load. Assuming no load losses to be zero, the no load current down by the motor from the supply
A
lags the supply voltage
B
leads the supply voltage
C
is in phase with the supply voltage
D
is zero
2
GATE EE 2001
MCQ (Single Correct Answer)
+2
-0.6
A star-connected 440 V, 50 Hz alternators has per phase synchronous reactance of 10 Ω. It supplies a balanced capacitive load current of 20 A, as shown in the per phase equivalent circuit of Figure. It is desirable to have zero voltage regulation. The load power factor should be GATE EE 2001 Electrical Machines - Synchronous Machines Question 58 English
A
0.82
B
0.47
C
0.39
D
0.92
3
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A single-phase, 2000 V alternator has armature resistance and reactance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 A load at 0.8 leading power-factor is:
A
7%
B
-8.9%
C
14%
D
0%
4
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
A three phase alternator is wound with a 60 degree phase-spread armature windings and develops 300 kVA. If the armature is reconnected utilizing all the coils for single phase operation with a phase spread of 180 degrees, the new rating of the machine is
A
100 kVA
B
200 kVA
C
250 kVA
D
300 kVA
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