Gate EE-2015-1 Question Paper With Solutions
Q. 21.A separately excited DC generator has an armature resistance of 0.1Ω
and negligible armature inductance. At rated field current and rated rotor speed,
its open-circuit voltage is 200 V. When this generator is operated at half the
rated speed, with half the rated field current, an uncharged 1000μF capacitor
is suddenly connected across the armature terminals. Assume that the speed
remains unchanged during the transient. At what time (in microsecond) after the
capacitor is connected will the voltage across it reach 25 V?
(A) 62.25
(B) 69.3
(C)73.25
(D) 77.3
Answer:(B)
Explanation:
