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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
What is the surge impedance loading of 400 kV line with surge impedance given as 160 Ω

400 MW
1000 MW
1000 kW
250 MW

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

SIL = (kV)²/Z₀

GETCO Exam Paper (22-07-2015)
The PU impedance of a 1089 MVA, 33 kV generator is 1, the ohmic value of its impedance is:

10
1
100
0.5

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GETCO Exam Paper (22-07-2015)
I am looking _____ my pen. Have you seen it?

to
at
after
for

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

switching surge
corona effect
lightning surge
excessive fault voltages

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

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

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 insulation strength of an EHV transmission line is mainly governed by

Load power factor
Corona
Harmonics
Switching over voltages

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

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