GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is leading unity zero lagging leading unity zero lagging 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) Slip at maximum torque depends on stator reactance stator resistance load current rotor resistance and reactance stator reactance stator resistance load current rotor resistance and reactance ANSWER EXPLANATION DOWNLOAD EXAMIANS APP at maximum torque:S=R₂/X₂
GETCO Exam Paper (22-07-2015) In case of a balanced three phase sinusoidal AC supply, because of the phase difference neutral wire is not required, if load is balanced rotating magnetic field is produced all are correct neutral current is high if load is not balanced neutral wire is not required, if load is balanced rotating magnetic field is produced all are correct neutral current is high if load is not balanced 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) Normally the angle of the transmission line is kept _____ because of _____ reasons 90, transient stability 45, transient stability 45, steady state stability 90, steady state stability 90, transient stability 45, transient stability 45, steady state stability 90, steady state stability ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The line current in a three phase unbalanced load are Ir= 4+j6, Ib= 2-j2 and Ic= -3+j2, then zero sequence component of current will be 3 - j6 9 + j10 3 + j6 1 + j2 3 - j6 9 + j10 3 + j6 1 + j2 ANSWER DOWNLOAD EXAMIANS APP
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