MGVCL Exam Paper (30-07-2021 Shift 3)
The most commonly used method for the protection of three phase feeder is

Reverse power protection
None of these
Time graded protection
Differential protection

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MGVCL Exam Paper (30-07-2021 Shift 3)
A conductor having surface density is embedded in a dielectric medium of permittivity. The electric field in the medium is E. If it is known that the pressure p on the conductor surface is equal to the electric energy density in the medium, then p (in SI unit)is given by

σ²/(4π)
σ/(4πε)
σ²/(2ε)
σ²/(2πε)

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MGVCL Exam Paper (30-07-2021 Shift 3)
Determine the ohmic value of the current limiting reactor per phase external to a 40 MVA, 15 kV, 50 Hz, three phase synchronous generator which can limit the current on short circuit of 6 times the full load current. The reactance of the synchronous generator is 0.06 pu.

0.8 Ω
0.2 Ω
0.4 Ω
0.6 Ω

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MGVCL Exam Paper (30-07-2021 Shift 3)
____ is the rms value of AC component of the current in the pole at the instant of contact separation.

Symmetrical breaking current
Asymmetrical breaking current
Making current
Symmetrical short circuit current

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