GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is unity lagging leading zero unity lagging leading zero 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) In differential protection scheme, a stabilizing resistance connected to block harmonics reduce the effect of non identical CTs increase the relay sensitivity increase the current limit block harmonics reduce the effect of non identical CTs increase the relay sensitivity increase the current limit ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In the standard B-H curve X axis and Y axis intercepts respctively represents Hysteresis loss and Flux Flux and MMF coercive force and residual magnetism residual magnetism and coercive force Hysteresis loss and Flux Flux and MMF coercive force and residual magnetism residual magnetism and coercive force ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In a DC motor, back EMF value becomes maximum at _____ full load 3/4 load no load 1/2 load full load 3/4 load no load 1/2 load ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Answer in official key is “1/2 load ”.
GETCO Exam Paper (22-07-2015) Select the wrong statement from the following in relation to power flow analysis Approximation is used in FDLF method Y Bus is required for power flow analysis jacobian is always required No of ittretion in N R method can not be more than 30 for any system Approximation is used in FDLF method Y Bus is required for power flow analysis jacobian is always required No of ittretion in N R method can not be more than 30 for any system ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The steady state stability of the power systems is most effected by power factor of the load stability of generator transmission line reactance voltage at generator bus power factor of the load stability of generator transmission line reactance voltage at generator bus ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS