TRANSMISSION AND DISTRIBUTION OF ELECTRICAL POWER- 5

41. A.C.S.R. conductor having 7 steel strands surrounded by 25 aluminium conductors will be specified as ___________

25 / 7

50 / 15

7 / 25

15 / 50

42. The main function of a fuse is to __________

. protect the line

open the circuit

protect the appliance

prevent excessive currents

43. Which of the following medium is employed for extinction of arc in air circuit breaker?

water

oil

air

SF6

44. A thermal protection switch can protect against __________

short circuit

temperature

overload

overvoltage

45. Thermal overload relays are used to protect the motor against over current due to _________

short circuit

heavyloads

grounds

all of the above

46. In a circuit breaker the basic problem is to ______

maintain the arc

extinguish the arc

transmit large power

emit the ionizing electrons

47. Which of the following is the least expensive protection for over current is low voltage system?

rewireable fuse

isolator

. oil circuit breaker

air break circuit breaker

48. The single phasing relays are used for the protection of _________

single phase motors only

two phase motors only

two single phase motors running in parallel

three phase motors

49. The material used for fuse must have __________

low melting point and high specific resistance

. low melting point and low specific resistance

high melting point and low specific resistance

. low melting point and any specific resistance

50. H.R.C. fuse, as compared to a rewirable fuse, has _________

. no ageing effect

high speed of operation

high rupturing capacity

all of the above

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