1
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
Figure shows the magnetization curves of an alternator at rated armature current, unity power factor and also at no load. The magnetization curve for rated armature current, 0.8 power factor leading is given by GATE EE 2001 Electrical Machines - Synchronous Machines Question 70 English
A
curve A
B
curve B
C
curve C
D
curve D
2
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'
3
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
4
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
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