GETCO Exam Paper (22-07-2015) 100% string efficiency means One of the insulator discs shorted Equal potential across each disc None uniform potential distribution across each disc Zero potential across each disc One of the insulator discs shorted Equal potential across each disc None uniform potential distribution across each disc Zero potential across each disc ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Earth wire on EHV overhead transmission line is provided to protect the line against excessive fault voltages switching surge lightning surge corona effect excessive fault voltages switching surge lightning surge corona effect ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Calculate torque developed by the 3-phase, 5 HP, 4 pole induction motor runs at 1500 rpm 22 N-m 10 N-m 0 N-m 23.5 N-m 22 N-m 10 N-m 0 N-m 23.5 N-m ANSWER EXPLANATION DOWNLOAD EXAMIANS APP P = 2πTN/60 where N is speed in rpm
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is leading zero unity lagging leading zero unity lagging ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Voltage regulation = ((no load voltage)-(full load voltage)/(no load voltage))VR at leading PF = ((I*R*cosφ)-(I*X*sinφ))/VVR at lagging PF = ((I*R*cosφ)+(I*X*sinφ))/V
GETCO Exam Paper (22-07-2015) Select the wrong statement from the following in relation to power flow analysis jacobian is always required Approximation is used in FDLF method Y Bus is required for power flow analysis No of ittretion in N R method can not be more than 30 for any system jacobian is always required Approximation is used in FDLF method Y Bus is required for power flow analysis No of ittretion in N R method can not be more than 30 for any system ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) What is the surge impedance loading of 400 kV line with surge impedance given as 160 Ω 1000 kW 400 MW 250 MW 1000 MW 1000 kW 400 MW 250 MW 1000 MW ANSWER EXPLANATION DOWNLOAD EXAMIANS APP SIL = (kV)²/Z₀
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