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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
The magnitude of sum of two sinusoidal AC voltages is equal to the magnitude of each individual voltage, What must be the phase difference between voltages?

90
60
180
120

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GETCO Exam Paper (22-07-2015)
100% string efficiency means

Zero potential across each disc
One of the insulator discs shorted
Equal potential across each disc
None uniform potential distribution across each disc

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GETCO Exam Paper (22-07-2015)
Fast excitation system of the generator will _____

Improve the dynamic stability
Improve the voltage control
Improve the power factor
Improve the reactive power control

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

small inductive current
resistance switching
capacitance switching
asymmetrical current

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

zero
lagging
unity
leading

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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)
Select the wrong statement from the following in relation to power flow analysis

jacobian is always required
Approximation is used in FDLF method
Y Bus is required for power flow analysis
No of ittretion in N R method can not be more than 30 for any system

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