Related Questions

Which of the following circuit breakers has high reliability and minimum maintenance ?
A Air blast circuit breakers
B Circuit breaker with SF6 gas
C Vacuum circuit breakers
D Oil circuit breakers
The line insulation is the insulation level of the station equipment.
A less than
B same as
C more than
D proportional to
E not directly related with
The insulation between windings and grounded core and the insulation between the windings of the same phase is
A minor insulation
B major insulation
C either of the above
D none of the above
Upto the critical radius of insulation, added insulation, will
A Increase the heat loss
B Decrease heat loss and will have no effect beyond that
C Decrease heat flux
D Reduce convection heat loss compared to conduction heat less
A practical formula for determining the thickness of insulation between low voltage and high voltage windings is
A 1 + 0.2 kV mm
B 2 + 0.5 kV mm
C 4 + 0.7 kV mm
D 5 + 0.9 kV mm
The time of closing the cycle, in modern circuit breakers is
A 0.003 sec
B 0.001 sec
C 0.01 sec
D 0.10 sec
E none of the above
Circuit breakers are essentially
A current carrying contacts called electrodes
B arc extinguishers
C circuits to break the system
D transformers to isolate the two systems
E any of the above
Circuit breakers usually operate under
A transient state of short-circuit current
B sub-transient state of short-circuit current
C steady state of short-circuit current
D after D. C. component has ceased
Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
A Tangent galvanometer
B Meggar
C Current transformer
D None of the above
L is older than M and taller than N. O is younger than P, older than N and shorter than Q. R is older than S, younger than N, shorter than S and taller than Q. S is older than L, M, O, P, Q, R and S is necessarily false?
A O is the shortest of the group.
B N is the second tallest of the group.
C L is the tallest of the group.
D Q is the third oldest of the group.

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