MGVCL Exam Paper (30-07-2021 Shift 2)
A 1000 kVA ONAN cooled transformer has a load of 500 kVA throughout the day except for a period of 4 hours. What is the permissible overload for a duration of four hours. Assume the permissible load kVA as a fraction of rated kVA is 1.24.

2480 kVA
930 kVA
1240 kVA
620 kVA

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MGVCL Exam Paper (30-07-2021 Shift 2)
In the circuit of figure, the switch is closed to position-1 for a long time. At t = 0 the switch position is changed from postion-1 to postion-2. Find an expression for the current i(t).

i(t) = (E/R) cos√(LC) t A
i(t) = (E/R) sin√(LC) t A
i(t) = (E/R) sin[1/√(LC)]t A
i(t) = (E/R) cos[1/√(LC)]t A

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MGVCL Exam Paper (30-07-2021 Shift 2)
A short-shunt dc compound generator supplies 50 A at 300 V. If the shunt field resistance, series field resistance and armature resistance are 30 Ω, 0.03Ω, and 0.05 Ω respectively, determine the e.m.f. generated.

306.5 V
308.5 V
304.5 V
302.5 V

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