1
GATE EE 1999
+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
2
GATE EE 1998
+2
-0.6
The armature of a single phase alternator is completely wound with T single turn coils distributed uniformly. The induced voltage in each turn is 2 Volts (rms). The emf of the whole winding is
A
2 T volt
B
1.11 T volt
C
1.414 T volt
D
1.273 T volt
3
GATE EE 1997
Fill in the Blanks
+2
-0
A single-phase alternator has a synchronous reactance of $$2$$ $$ohms$$ and negligible resistance. If it supplies $$10$$ $$A$$ to a purely capacitive load at $$200V,$$ then generated $$e.m.f$$ will be ... $$V$$ and the regulation will be ...... $$\%$$
4
GATE EE 1993
+2
-0.6
A three phase alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed a field current of $${{\rm I}_f}$$ is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current
A
would be equal to $${{\rm I}_f}$$
B
would be equal to $$2$$ $${{\rm I}_f}$$
C
would be equal to $${{\rm I}_f}/2$$
D
cannot be predicted due to insufficient data
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics
Digital Electronics
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