GETCO Exam Paper (22-07-2015) In case of HVDC transmission there is _____ charging current but no skin effect both charging effect and skin effect no charging current but skin effect no charging current no skin effect charging current but no skin effect both charging effect and skin effect no charging current but skin effect no charging current no skin effect ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The RMS value of the voltage u(t) = 3 + 4 cos(3t) is 3 + 2(1.41) 7 5 4.12 3 + 2(1.41) 7 5 4.12 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) Hopkinson's test is the test to be carried out on two identical induction motors induction motor with synchronous motor induction motor with any DC motor two identical DC motors two identical induction motors induction motor with synchronous motor induction motor with any DC motor two identical DC motors ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In hopkinson test known as regenerative testtwo identical machine coupledD.C shunt motorD.C shunt generatortemperature rise can be check under rated conditionlarge machine can be tested without drawing much power.
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is unity lagging zero leading unity lagging zero leading 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) 100% string efficiency means Zero potential across each disc None uniform potential distribution across each disc Equal potential across each disc One of the insulator discs shorted Zero potential across each disc None uniform potential distribution across each disc Equal potential across each disc One of the insulator discs shorted ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Penalty factor in power system economical operation is measure of generation cost fuel cost all are correct Line loss generation cost fuel cost all are correct Line loss ANSWER DOWNLOAD EXAMIANS APP
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