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GATE old paper Questions and Solutions Set 2

GATE old paper Questions and Solutions Set 2
Question:-
Option (A)
The magnitude of terminal voltage decreases, and the field current does not change
Option (B)
The magnitude of terminal voltage increases, and the field current does not change
Option (C)
The magnitude of terminal voltage increases, and the field current increases
Option (D)
The magnitude of terminal voltage does not change, and the field current decreases
Correct Option:
Question:-
Option (A)
Both machines act as generators
Option (B)
The dc machine acts as a generator, and the induction machine acts as a motor
Option (C)
The dc machine acts as a motor, and the induction machine acts as a generator
Option (D)
Both machines act as motors
Correct Option:
C
Question:-
Option (A)
0.17875 A
Option (B)
0.2A
Option (C)
0.375A
Option (D)
60 kA
Correct Option:
C
Question Solution:
Current through the operating coil= {(250 x 5) / 400} – {(220 x 5) / 400} = (3/8) = 0.375A