GETCO Exam Paper (22-07-2015) For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be 7\8 2\3 6\7 5\6 7\8 2\3 6\7 5\6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP fractional pitch = Cos( α/2)α is obtain from: (nα/2)=90˚ where n is harmonicα=25.7143˚fractional pitch=6/7
GETCO Exam Paper (22-07-2015) In G-S method of power flow problem, the number of iterations _____ remains fixed depends on voltage control buses depends on tolerance depends on no of buses remains fixed depends on voltage control buses depends on tolerance depends on no of buses ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The breaking capacity of a CB is usually expressed interms of volts MW amperes MVA volts MW amperes MVA ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is lagging leading zero unity lagging leading zero 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
GETCO Exam Paper (22-07-2015) The insulation strength of an EHV transmission line is mainly governed by Load power factor Corona Harmonics Switching over voltages Load power factor Corona Harmonics Switching over voltages 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 jacobian is always required Y Bus is required for power flow analysis No of ittretion in N R method can not be more than 30 for any system Approximation is used in FDLF method jacobian is always required 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
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