GETCO Exam Paper (22-07-2015) For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be 6\7 2\3 5\6 7\8 6\7 2\3 5\6 7\8 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 Z matrix of 2 port network is given by [0.9 0.2 : 0.2 0.6]. The element Y22 of the corresponding Y matrix of the same network is given by 1.2 0.4 1.8 -0.4 1.2 0.4 1.8 -0.4 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) During the insulation co-ordination in the sub station, the lowest insulation strength is at circuit breaker transformer bus bar CTs and PTs circuit breaker transformer bus bar CTs and PTs ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 7 4.12 5 3 + 2(1.41) 7 4.12 5 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) Stray loss is equal to _____ frictional loss & copper loss copper loss and iron loss mechanical loss & iron loss field copper loss & iron loss frictional loss & copper loss copper loss and iron loss mechanical loss & iron loss field copper loss & iron loss ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Answer in official key is “mechanical loss & iron loss ”.Many times stray loss is also considered as total loss actually accured minus calculatable loss. This means loss that can be calculated is known as stray loss.
GETCO Exam Paper (22-07-2015) Which of the following is not function of substation batteries? operating protective relay systems operating automatic control circuits provide supply to the excitation system emergency lighting circuits operating protective relay systems operating automatic control circuits provide supply to the excitation system emergency lighting circuits ANSWER DOWNLOAD EXAMIANS APP
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