GETCO Exam Paper (22-07-2015) HVDC transmission is preferred to EHV AC because System stability can be improved VAR compensation is not required in it Harmonic problem is avoided Its terminal equipment are inexpensive System stability can be improved VAR compensation is not required in it Harmonic problem is avoided Its terminal equipment are inexpensive 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 5\6 2\3 6\7 7\8 5\6 2\3 6\7 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 RMS value of the voltage u(t) = 3 + 4 cos(3t) is 7 4.12 3 + 2(1.41) 5 7 4.12 3 + 2(1.41) 5 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) In sub stations for making and breaking of load current relays are used load interrupter switches are used isolators are used circuit breakers are used relays are used load interrupter switches are used isolators are used circuit breakers are used ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The steady state stability of the power systems is most effected by transmission line reactance stability of generator power factor of the load voltage at generator bus transmission line reactance stability of generator power factor of the load voltage at generator bus ANSWER DOWNLOAD EXAMIANS APP
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 0.4 -0.4 1.8 1.2 0.4 -0.4 1.8 1.2 ANSWER DOWNLOAD EXAMIANS APP
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