GETCO Exam Paper (22-07-2015) No load efficiency of tranformer is _____ than full load efficiency depends on load greater same lesser depends on load greater same lesser 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 250 MW 400 MW 1000 MW 1000 kW 250 MW 400 MW 1000 MW ANSWER EXPLANATION DOWNLOAD EXAMIANS APP SIL = (kV)²/Z₀
GETCO Exam Paper (22-07-2015) Fast excitation system of the generator will _____ Improve the dynamic stability Improve the reactive power control Improve the voltage control Improve the power factor Improve the dynamic stability Improve the reactive power control Improve the voltage control Improve the power factor ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Which of the following is a reason to decouple AVR and LFC loops when there is a shortage of reactive power? deference of error is the main reason AVR loop response is slower than LFC loop Change in voltage magnitude marginally affects real power angle of the voltage is not considered deference of error is the main reason AVR loop response is slower than LFC loop Change in voltage magnitude marginally affects real power angle of the voltage is not considered ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Select the wrong statement from the following in relation to power flow analysis Approximation is used in FDLF method Y Bus is required for power flow analysis jacobian is always required No of ittretion in N R method can not be more than 30 for any system Approximation is used in FDLF method Y Bus is required for power flow analysis jacobian is always required 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) A transformer has negative voltage regulation when its load PF is zero leading lagging unity zero leading lagging unity 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
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