1
GATE EE 2014 Set 3
Numerical
+2
-0
A non-salient pole synchronous generator having synchronous reactance of $$0.8$$ $$pu$$ is supplying $$1$$ $$pu$$ power to a unity power factor load at a terminal voltage of $$1.1$$ $$pu$$. Neglecting the armature resistance, the angle of the voltage behind the synchronous reactance with respect to the angle of the terminal voltage in degrees is ____________.
Your input ____
2
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A three phase synchronous generator is to be connected to the infinite bus. The lamps are connected as shown in the figure for the synchronization. The phase sequence of bus voltage is $$R$$-$$Y$$-$$B$$ and that of incoming generator voltage is $$R'$$ - $$Y'$$ - $$B'.$$ GATE EE 2014 Set 1 Electrical Machines - Synchronous Machines Question 25 English

It was found that the lamps are becoming dark in the sequence $${L_a} - {L_b} - {L_c}.$$ It means that the phase sequence of incoming generator is

A
opposite to infinite bus and its frequency is more than infinite bus
B
opposite to infinite bus but its frequency is less than infinite bus
C
same as infinite bus and its frequency is more than infinite bus
D
same as infinite bus and its frequency is less than infinite bus
3
GATE EE 2011
MCQ (Single Correct Answer)
+2
-0.6
The direct axis and quadrature axis reactances of a salient pole alternator are $$1.2$$ $$p.u$$ and $$1.0$$ $$p.u$$ respectively. The armature resistance is negligible. If this alternator is delivering rated $$kVA$$ at $$upf$$ and at rated voltage then its power angle is
A
$${30^ \circ }$$
B
$${45^ \circ }$$
C
$${60^ \circ }$$
D
$${90^ \circ }$$
4
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
A separately excited $$dc$$ machine is coupled to a $$50Hz,$$ three-phase, 4-pole induction machine as shown in the figure. The dc machine is energized first and the machines rotate at $$1600$$ $$rpm.$$ Subsequently the induction machine is also connected to a $$50Hz,$$ three-phase source, the phase sequence being consistent with the direction of rotation. In steady state GATE EE 2010 Electrical Machines - Synchronous Machines Question 27 English
A
both machine act as generators
B
the $$dc$$ machine acts as a generator, and the induction machine acts as a motor
C
the $$dc$$ machine acts as a motor, and the induction machine acts as a generator
D
both machines act as motors
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