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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
In a thermal power plant, heat from the flue gases is recovered in

Economizer
chimney
Electric precipitator
condenser

ANSWER DOWNLOAD EXAMIANS APP

GETCO Exam Paper (22-07-2015)
For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be

5\6
6\7
7\8
2\3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

fractional pitch = Cos( α/2)
α is obtain from: (nα/2)=90˚ where n is harmonic
α=25.7143˚
fractional pitch=6/7

GETCO Exam Paper (22-07-2015)
The RMS value of the voltage u(t) = 3 + 4 cos(3t) is

4.12
7
5
3 + 2(1.41)

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

if voltage is given by,
v(t) = V₀ + V₁ cos(3t) + V₂ cos(5t)+ …
RMS value is given by,
√( V₀² + (V₁/√2)² + (V₂/√2)² + …)

GETCO Exam Paper (22-07-2015)
To find the most accurate values of resistance and inductance of the transmission line

Distributed parameter configuration used
T configuration is used
End condenser configuration is used
Pi configuration is used

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

excessive fault voltages
corona effect
lightning surge
switching surge

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

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))/V
VR at lagging PF = ((I*R*cosφ)+(I*X*sinφ))/V

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

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