BSNL TTA (JE) ELECTRICAL 200 EXPECTED QUESTIONS PART TWO

NOTE-NO OF QUESTIONS 115
ANSWER KEY-Correct answer is indicated by symbol (V) in options.
HINTS-In some questions options E-HINTS is indicating the hints of answer

SAMPLE QUESTIONS AND ANSWER
1) The fault clearing time of a circuit breaker is usually
A [ ]) few minutes
B [ ]) few seconds
C [ ]) one second
D [v]) few cycles of supply voltage.
2) Which of the following circuit breakers is preferred for EHT application
A [ ]) Air blast circuit breakers
B [ ]) Minimum oil circuit breakers
C [ ]) Bulk oil circuit breakers
D [v]) SF6 oil circuit breakers.
3) In air blast circuit breakers, the pressure of air is of the order of
A [ ]) 100 mm Hg
B [ ]) 1 kg/cm2
C [v]) 20 to 30 kg/cm2
D [ ]) 200 to 300 kg/cm2 .
4) SF6 gas is
A [ ]) sulphur fluoride
B [ ]) sulphur difluoride
C [ ]) sulphur hexafluorine
D [v]) sulphur hexafluoride.
5) SF6 gas
A [ ]) is yellow in color
B [ ]) has pungent odor
C [ ]) is highly toxic
D [v]) is non-inflammable.
6) The pressure of SF6 gas in circuit breakers is of the order of
A [ ]) 100 mm Hg
B [ ]) 1 kg/cm2
C [v]) 3 to 5 kg/cm2
D [ ]) 30 to 50 kg/cm2.
7) Out of the following circuit breakers, which one has the lowest voltage range ?
A [v]) Air-break circuit breaker
B [ ]) Tank type oil circuit breaker
C [ ]) Air-blast circuit breaker
D [ ]) SF6 circuit breaker.
8) Which of the following circuit breaker can be installed on 400 kV line
A [ ]) Tank type oil circuit breaker
B [ ]) Miniature circuit breaker
C [ ]) Vacuum circuit breaker
D [v]) Air blast circuit breaker.
9) In a vacuum circuit breaker, the vacuum is of the order of
A [ ]) 10mm Hg
B [ ]) 10-2mmHg
C [ ]) l0-6 mmHg
D [v]) 10-9mmHg.
10) Fusing factor for a HRC fuse is
A [v]) Minimum fusing current / Current rating
B [ ]) Minimum fusing current / Minimum rupturing time
C [ ]) Maximum fusing current / Minimum fusing current
D [ ]) Minimum fusing current / Prospective current of circuit.
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