MGVCL Exam Paper (30-07-2021 Shift 1)
The expression for voltage regulation of a short transmission line for lagging power factor is given by: ___, where, 'I' is the line current, 'V_r' is the receiving end voltage, 'R' is the line resistance and 'X' is the line reactance.

(IX cosφ_r + IR sinφ_r)/V_r
(IR cosφ_r + IX sinφ_r)/V_r
(IX cosφ_r - IR sinφ_r)/V_r
(IR cosφ_r - IX sinφ_r)/V_r

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MGVCL Exam Paper (30-07-2021 Shift 1)
For protection of inter-turn fault in transformer, the relays preferred are

Buchholz's relay and differential relay
Overcurrent relay and differential relay
Overcurrent relay and Buchholz's relay
Buchholz's relay, overcurrent relay and differential relay

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MGVCL Exam Paper (30-07-2021 Shift 1)
Determine maximum permissible load which a 15 MVA, ONAN cooled transformer to IS : 2026 can take for 6 hr, if the initial load on it was 12 MVA. The weighted ambient temperature is 20˚C. Assume the permissible load kVA as a fraction of rated kVA is 1.25.

12 MVA
15 MVA
18.75 MVA
9.6 MVA

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