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)
Medium voltage covered conductors (MVCC) are produced in voltage rating

less than 3.3 kV
between 132 kV to 200 kV
beyond 200 kV
between 6.6 kV to 33 kV

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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 :

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

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