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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
Penalty factor in power system economical operation is measure of

fuel cost
generation cost
Line loss
all are correct

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

7\8
5\6
6\7
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)
Speed of induction motor at rated torque is _____ than at maximum torque.

greater
same
depends on load
lesser

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GETCO Exam Paper (22-07-2015)
Shunt compensation in EHV line is resorted to

Reduce the fault level
Improve the stability
Improve voltage profile
Increase line impedance

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GETCO Exam Paper (22-07-2015)
An over-current relay of current rating 5 A and setting 150% is connected to a 200/5 A CT. Then the relay to pickup, the line current required is

200
300
150
100

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GETCO Exam Paper (22-07-2015)
In rotating electrical machines, the insulation temperature limit for class B type is

180˚C
150˚C
105˚C
130˚C

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

insulation Class and temperature limit(in ˚C) is given below:
Y - 90
A- 105
E- 120
B-130
F-155
H-180
C- above 180

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

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