1
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 ____
2
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
A three-phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load a normal excitation. The field excitation of the motor is first reduced to zero and then increased in reverse direction gradually. Then the armature current
A
Increases continuously
B
First increases and then decreases steeply
C
First decreases and then increases steeply
D
Remains constant
3
GATE EE 2008
MCQ (Single Correct Answer)
+1
-0.3
In a stepper motor, the detent torque means
A
minimum of the static torque with phase winding excited.
B
maximum of the static torque with phase winding excited.
C
minimum of the static torque with phase winding unexcited
D
maximum of the static torque with the phase winding unexcited
4
GATE EE 2008
MCQ (Single Correct Answer)
+1
-0.3
Distributed winding and short chording employed in AC machines will result in
A
increase in $$emf$$ and reduction in harmonics
B
reduction in $$emf$$ and increase in harmonics
C
increase in both $$emf$$ and harmonics
D
reduction in both $$emf$$ and harmonics
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Graduate Aptitude Test in Engineering
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CBSE
Class 12