GETCO Exam Paper (30-11-2008)

GETCO Exam Paper (30-11-2008)
The power transmitted will be maximum when

corona losses are least

reactance is high

receiving end voltage is more

sending end voltage is more

corona losses are least

reactance is high

receiving end voltage is more

sending end voltage is more

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GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

any of the above

saturation of magnetic circuit

large internal fault

over load

any of the above

saturation of magnetic circuit

large internal fault

over load

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GETCO Exam Paper (30-11-2008)
The delay fuses are used for protection of

light circuits

none of these

motors

fluorescent lamp

light circuits

none of these

motors

fluorescent lamp

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GETCO Exam Paper (30-11-2008)
Arc chutes are used in _____ C.B.s

vacuum

oil

air blast

minimum oil

vacuum

oil

air blast

minimum oil

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GETCO Exam Paper (30-11-2008)
When a star delta transformer bank of three single phase transformers is to be used for step down transformation with line voltages of 23000 V and 2300 V, the ratio of transformation will be

10.0:1

5.8:1

12.1:1

17.2:1

10.0:1

5.8:1

12.1:1

17.2:1

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GETCO Exam Paper (30-11-2008)
An air blast C.B. is usually employed for _____ duty

repeated

intermittent

instantaneous

short

repeated

intermittent

instantaneous

short

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