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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
The relay which is most sensitive to power swings (mal operation) is

Impedance Relay
Mho Relay
Reactance Relay
Over current Relay

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

150˚C
130˚C
180˚C
105˚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

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

unity
zero
lagging
leading

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

GETCO Exam Paper (22-07-2015)
"Overshoot" in a time response of control systems is indication of

none of this
steady state solution
measure of relative stability
final value of the output

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GETCO Exam Paper (22-07-2015)
In a given current transformer, If permissible current ratio error rated primary current is 5% the CT is suitable for

both measuring and protection
protection purpose
as power transformer
measuring purpose

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GETCO Exam Paper (22-07-2015)
The Y bus matrix is a sparse matrix because …

no of lines are less
lines are connected to less no. of buses
bus incidence matrix is a sparse matrix
Y primitive is a sparse matrix

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

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