EE MCQ

MGVCL Exam Paper (30-07-2021 Shift 1)
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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.

For lagging power factor = (IR*cosφ + Ixsinφ)/Vr

For leading power factor = (IR*cosφ - Ixsinφ)/Vr

Zero voltage regulation occurs on leading power factor only.

Related Question

MGVCL Exam Paper (30-07-2021 Shift 1)
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By inserting a plate of dielectric material between the plates of a parallel plate capacitor at constant potential, the energy stored in the capacitor is increased five times. The dielectric constant of the material is

Energy stored by capacitor, Q = ½CV²

Dielectric constant is directly proportional to C and capacitance is proportional to the dielectrical constant