1
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
Xd, Xd' and Xd" are steady stated-axis synchronous reactance, transient d-axis reactance and sub-transient d-axis reactance of a synchronous machine respectively. Which of the following statements is true?
A
Xd > Xd' > Xd"
B
Xd" > Xd' > Xd
C
Xd' > Xd" > Xd
D
Xd > Xd" > Xd'
2
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
The phase sequence of a three-phase alternator will reverse if
A
the field current is reversed keeping the direction of rotation same
B
the field current remains the same but the direction of rotation is reversed
C
the field current is reversed and the number of poles is doubled
D
the number of poles is doubled without reversing the field current
3
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
Higher synchronous reactance is preferred in the present day alternators, because one can have
A
reduced sub-transient currents
B
reduced harmonic currents
C
reduced transient currents
D
higher voltage regulation with load
4
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
A synchronous generator connected to an infinite bus is overexcited. Considering only the reactive power, from the point of view of the system, the machine acts as
A
a capacitor
B
an inductor
C
a resistor
D
None of the above
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