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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

Over current Relay
Mho Relay
Reactance Relay
Impedance Relay

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

6\7
5\6
2\3
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)
In sub stations for making and breaking of load current

relays are used
load interrupter switches are used
circuit breakers are used
isolators are used

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GETCO Exam Paper (22-07-2015)
In a DC motor, back EMF value becomes maximum at _____

full load
no load
3/4 load
1/2 load

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Answer in official key is “1/2 load ”.

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
100
300
150

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GETCO Exam Paper (22-07-2015)
Who was the political Guru of Netaji?

Lokmanya Tilak
Sardar Patel
R. Das
Gokhle

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

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