Exam preparation MCQs with answers

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Form Factor is the ratio of__________?
  • (A)  average value/r.m.s. value
  • (B)  average value/peak value
  • (C)  r.m.s. value/average value
  • (D)  r.m.s. value/peak value
Power factor of the system is kept high__________?
  • (A)  to reduce line losses
  • (B)  to maximise the utilization of the capacities of generators, lines and transformers
  • (C)  to reduce voltage regulation of the line
  • (D)  due to all above reasons
Pure inductive circuit____________?
  • (A)  consumes some power on average
  • (B)  does not take power at all from a line
  • (C)  takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
  • (D)  none of the above
Inductance of a coil Varies__________?
  • (A)  directly as the cross-sectional area of magnetic core
  • (B)  directly as square of number of turns
  • (C)  directly as the permeability of the core
  • (D)  inversely as the length of the iron path
  • (E)  as