GETCO Exam Paper (22-07-2015) The fault occurring in transmission actually are mostly L-G L-L-L L-L L-L-G L-G L-L-L L-L L-L-G ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 5 7 4.12 3 + 2(1.41) 5 7 4.12 3 + 2(1.41) ANSWER EXPLANATION DOWNLOAD EXAMIANS APP if voltage is given by,v(t) = V₀ + V₁ cos(3t) + V₂ cos(5t)+ …RMS value is given by,√( V₀² + (V₁/√2)² + (V₂/√2)² + …)
GETCO Exam Paper (22-07-2015) Which of the following is not function of substation batteries? operating protective relay systems provide supply to the excitation system operating automatic control circuits emergency lighting circuits operating protective relay systems provide supply to the excitation system operating automatic control circuits emergency lighting circuits ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Earth wire on EHV overhead transmission line is provided to protect the line against lightning surge switching surge corona effect excessive fault voltages lightning surge switching surge corona effect excessive fault voltages ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In rotating electrical machines, the insulation temperature limit for class B type is 130˚C 105˚C 150˚C 180˚C 130˚C 105˚C 150˚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) For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be 2\3 7\8 6\7 5\6 2\3 7\8 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
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