GETCO Exam Paper (22-07-2015) Which of the following is not function of substation batteries? emergency lighting circuits operating automatic control circuits provide supply to the excitation system operating protective relay systems emergency lighting circuits operating automatic control circuits provide supply to the excitation system operating protective relay systems ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Power Factor correcting element is generally connected in _____ series with load series with source parallel to the load parallel to source series with load series with source parallel to the load parallel to source ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) A transformer has negative voltage regulation when its load PF is leading lagging zero unity leading lagging zero 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) Which of the following breaking method save energy? dynamic breaking plugging regenerative breaking resistor breaking dynamic breaking plugging regenerative breaking resistor breaking ANSWER EXPLANATION DOWNLOAD EXAMIANS APP three types of electric breaking:Regenerative breaking( leads to economic and energy consevation)pugging (more efficient method of breaking)rheostatic breaking
GETCO Exam Paper (22-07-2015) No load efficiency of tranformer is _____ than full load efficiency depends on load greater lesser same depends on load greater lesser same ANSWER DOWNLOAD EXAMIANS APP
GETCO Exam Paper (22-07-2015) Fuel cell for power generation have drawback of _____ Synchronization problems Low life span Noise, pollution and maintenance problems Very high development costs Synchronization problems Low life span Noise, pollution and maintenance problems Very high development costs ANSWER DOWNLOAD EXAMIANS APP
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