GETCO Exam Paper (22-07-2015) In rotating electrical machines, the insulation temperature limit for class B type is 150˚C 105˚C 130˚C 180˚C 150˚C 105˚C 130˚C 180˚C ANSWER EXPLANATION DOWNLOAD EXAMIANS APP insulation Class and temperature limit(in ˚C) is given below:Y - 90A- 105E- 120B-130F-155H-180C- above 180
GETCO Exam Paper (22-07-2015) Select the wrong statement from the following in relation to power flow analysis 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 jacobian is always required Approximation is used in FDLF method ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Merz-Price protection is employed for protection of alternators motor transmission lines circuit breaker alternators motor transmission lines circuit breaker ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The insulation strength of an EHV transmission line is mainly governed by Harmonics Load power factor Switching over voltages Corona Harmonics Load power factor Switching over voltages Corona ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be 7\8 6\7 5\6 2\3 7\8 6\7 5\6 2\3 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) The relay which is most sensitive to power swings (mal operation) is Mho Relay Reactance Relay Over current Relay Impedance Relay Mho Relay Reactance Relay Over current Relay Impedance Relay ANSWER DOWNLOAD EXAMIANS APP
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