GETCO Exam Paper (22-07-2015) The PU impedance of a 1089 MVA, 33 kV generator is 1, the ohmic value of its impedance is: 0.5 10 100 1 0.5 10 100 1 ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The Y bus matrix is a sparse matrix because … bus incidence matrix is a sparse matrix no of lines are less Y primitive is a sparse matrix lines are connected to less no. of buses bus incidence matrix is a sparse matrix no of lines are less Y primitive is a sparse matrix lines are connected to less no. of buses ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The surge impedance loading of the line will _____ if the length of the line is double four times double become half remains same four times double become half remains same ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Surge impedance is independent of length of the line
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is leading zero lagging unity leading zero lagging unity 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 the standard B-H curve X axis and Y axis intercepts respctively represents coercive force and residual magnetism residual magnetism and coercive force Flux and MMF Hysteresis loss and Flux coercive force and residual magnetism residual magnetism and coercive force Flux and MMF Hysteresis loss and Flux ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) In rotating electrical machines, the insulation temperature limit for class B type is 150˚C 130˚C 180˚C 105˚C 150˚C 130˚C 180˚C 105˚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
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