MGVCL Exam Paper (30-07-2021 Shift 3)
The short circuit current of a solar cell is

inversely proportional to radiation intensity
constant and not affected by radiation
changes logarithmically with radiation
directly proportional to radiation intensity

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

Time graded protection
Differential protection
None of these
Reverse power protection

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MGVCL Exam Paper (30-07-2021 Shift 3)
In a 3-phase, 4-wire, 400/230 V system, a lamp (L₁) of 100 W is connected to one phase and neutral and a lamp (L₂) of 150 W is connected to the second pahse and neutral. If the neutral wire is disconnected accidently, what will be the voltage across a 150 W lamp (L₂)?

180 V
120 v
160 V
240 V

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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.

0.4 Ω
0.6 Ω
0.8 Ω
0.2 Ω

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MGVCL Exam Paper (30-07-2021 Shift 3)
The DC offset in fault current causes conventional over-current (OC) relays to :

sometimes under-reach and sometimes over-reach
under-reach
over-reach
reach remains unaffected due to DC offset

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