GETCO Exam Paper (22-07-2015) Which of the following is a reason to decouple AVR and LFC loops when there is a shortage of reactive power? Change in voltage magnitude marginally affects real power AVR loop response is slower than LFC loop angle of the voltage is not considered deference of error is the main reason Change in voltage magnitude marginally affects real power AVR loop response is slower than LFC loop angle of the voltage is not considered deference of error is the main reason ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) The rating of given on the name plate of a transformer indicates the: Apparent power which it draws from the supply mains True power whichh it draws from the supply mains Apparent power which it can supply True power which it can supply Apparent power which it draws from the supply mains True power whichh it draws from the supply mains Apparent power which it can supply True power which it can supply ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The rating of given on the name plate of a transformer indicates the:Apparent power which it can supply S=V( supplied voltage)*I (load current)active power = v* i*cosφreactive power = v* i*sinφ
GETCO Exam Paper (22-07-2015) Which of the following is the wrong statement in terms of slack bus? it has finite reactive power generation capability voltage and angle is specified at this bus it should be located at the centre of the area it should be the largest generator bus in the system it has finite reactive power generation capability voltage and angle is specified at this bus it should be located at the centre of the area it should be the largest generator bus in the system ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) During the insulation co-ordination in the sub station, the lowest insulation strength is at transformer circuit breaker bus bar CTs and PTs transformer circuit breaker bus bar CTs and PTs ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Which of the following is the most likely reason for large overshoot in a control system? high positive correcting torque High gain in a system presence of dead time delay high retarding torque high positive correcting torque High gain in a system presence of dead time delay high retarding torque ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is unity zero leading lagging unity zero leading 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
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