CL wadhwa bits solutions(47-52)

Lesson 9 of 21 • 39 upvotes • 8:01mins

Anvesh Sameer

47. For a lumped inductive load, with increase in supply ferquency: (a) P and Q increase (b) P increases, Q decreases (c) P decreases, Q increases (d) P and Q decrease. 48. Standard impulse testing of a power transformer requires: (a) Two applications of chopped wave followed by one application of a full wave (b) One application of chopped wave followed by one application of a full wave (c) One application of chopped wave followed by two applications of a full wave (d) None of the above. 49. The supply voltage |V| in diagram below is: 40 V 70 V 100 V V (a) 210 V (b) 70 V (c) 50 V (d) 230 V. 50. The chances of arc interruption in subsequent current zero: (a) Increases in case of OCB (b) Decreases in case of OCB (c) Interruption is always at first current zero (in OCB) (d) None of the above. 51. The chances of arc interruption in subsequent current zeros: (a) Increases in case of ABCB but decreases in OCB (b) Decreases in case of ABCB but increases in OCB (c) Decreases in both the cases (d) Increases in both the cases. 52. The velocity of travelling wave through a cable of relative permittivity 9 is: (a) 9 × 108 metres/sec (b) 3 × 108 metres/sec (c) 108 metres/sec (d) 2 × 108 metres/sec.