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.

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

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MGVCL Exam Paper (30-07-2021 Shift 1)
Insulation Power Factor testing on an oil-filled transformer is not helpful in determining ___

Movement of the windings (change in capacitance)
Whether the oil test indicates moisture
Condition of paper insulation (change in watts losses)
Turns ratio values

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