GETCO Exam Paper (22-07-2015) What is the surge impedance loading of 400 kV line with surge impedance given as 160 Ω 250 MW 1000 kW 400 MW 1000 MW 250 MW 1000 kW 400 MW 1000 MW ANSWER EXPLANATION DOWNLOAD EXAMIANS APP SIL = (kV)²/Z₀
GETCO Exam Paper (22-07-2015) No load efficiency of tranformer is _____ than full load efficiency greater lesser depends on load same greater lesser depends on load same ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In synchronous motor, V-curve is a graph of Armature current Vs Field current Armature current Vs power factor Armature current Vs active power Armature current Vs reactive power Armature current Vs Field current Armature current Vs power factor Armature current Vs active power Armature current Vs reactive power ANSWER EXPLANATION DOWNLOAD EXAMIANS APP v curve: armature current → field currentInverted V curve: power factor → field current
GETCO Exam Paper (22-07-2015) Fast excitation system of the generator will _____ Improve the voltage control Improve the reactive power control Improve the power factor Improve the dynamic stability Improve the voltage control Improve the reactive power control Improve the power factor Improve the dynamic stability ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In case of a balanced three phase sinusoidal AC supply, because of the phase difference neutral wire is not required, if load is balanced all are correct rotating magnetic field is produced neutral current is high if load is not balanced neutral wire is not required, if load is balanced all are correct rotating magnetic field is produced neutral current is high if load is not balanced ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The Y bus matrix is a sparse matrix because … bus incidence matrix is a sparse matrix no of lines are less Y primitive is a sparse matrix lines are connected to less no. of buses bus incidence matrix is a sparse matrix no of lines are less Y primitive is a sparse matrix lines are connected to less no. of buses ANSWER DOWNLOAD EXAMIANS APP
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