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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
Switching surges are

short duration transient voltage
high votage DCs
high voltage Acs
power frequency voltage

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GETCO Exam Paper (22-07-2015)
A transformer has negative voltage regulation when its load PF is

leading
lagging
zero
unity

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Voltage regulation = ((no load voltage)-(full load voltage)/(no load voltage))
VR at leading PF = ((I*R*cosφ)-(I*X*sinφ))/V
VR at lagging PF = ((I*R*cosφ)+(I*X*sinφ))/V

GETCO Exam Paper (22-07-2015)
The value of holding ratio of relay is always

less than 1
zero
Infinite
greater than 1

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GETCO Exam Paper (22-07-2015)
Earth wire on EHV overhead transmission line is provided to protect the line against

corona effect
lightning surge
excessive fault voltages
switching surge

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GETCO Exam Paper (22-07-2015)
Current chopping phenomenon is related to

small inductive current
capacitance switching
resistance switching
asymmetrical current

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GETCO Exam Paper (22-07-2015)
No load efficiency of tranformer is _____ than full load efficiency

same
greater
lesser
depends on load

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MORE MCQ ON GETCO Exam Paper (22-07-2015)

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