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MCQs

Total Questions : 327 | Page 6 of 33 pages
Question 51. If resistance is 20 q. and inductance is 27 in a r-l series circuit, then time constant of this circuit will be
  1.     0.001 s
  2.     0.1 s
  3.     10 s
  4.     100 s
 Discuss Question
Answer: Option B. ->  0.1 s
Question 52. Wire-wound resistors are unsuitable for use at high frequencies because they
  1.     Create more electrical noise
  2.     Are likely to melt under excessive eddy current heat
  3.     Consume more power
  4.     Exhibit unwanted inductive and capacitive effects
 Discuss Question
Answer: Option D. ->  Exhibit unwanted inductive and capacitive effects
Question 53. For a sine wave with peak value emax ___________ 8.30. the average value is
  1.     0.636 Emax
  2.     0.707 Emax
  3.     0.434 EWc
  4.     lAUEmax
 Discuss Question
Answer: Option A. ->  0.636 Emax
Question 54. Ohm is unit of all of the following except
  1.     Inductive reactance
  2.     Capacitive reactance
  3.     Resistance
  4.     Capacitance
 Discuss Question
Answer: Option D. ->  Capacitance
Question 55. The series and parallel resonance on l-c circuit' differs in that
  1.     Series resistance needs a low-resistance source for sharp rise in current
  2.     Series resonance needs a high-resistance source for sharp increase in current
  3.     Parallel resonance needs a low-resistance source for a sharp increase in impedance
  4.     Parallel resonance needs a low-resistance source for a sharp rise in line current
 Discuss Question
Answer: Option A. ->  Series resistance needs a low-resistance source for sharp rise in current
Question 56. The period of a wave is
  1.     The same as frequency
  2.     Time required to complete one cycle
  3.     Expressed in amperes
  4.     None of the above
 Discuss Question
Answer: Option B. ->  Time required to complete one cycle
Question 57. The power factor at resonance in r-l-c parallel circuit is
  1.     Zero
  2.     0.08 lagging
  3.     0.8 leading
  4.     Unity
 Discuss Question
Answer: Option D. ->  Unity
Question 58. If two sine waves of the same frequency have a phase difference of jt radians, then
  1.     Both will reach their minimum values at the same instant
  2.     Both will reach their maximum values at the same instant
  3.     When one wave reaches its maxi¬mum value, the other will reach its minimum value
  4.     None of the above
 Discuss Question
Answer: Option C. ->  When one wave reaches its maxi¬mum value, the other will reach its minimum value
Question 59. In a three-phase supply floating neutral is undesirable because it way give rise to
  1.     High voltage across the load
  2.     Low voltage across the load
  3.     Unequal line voltages across the load
  4.     None of these
 Discuss Question
Answer: Option C. ->  Unequal line voltages across the load
Question 60. Which of the following coil will have large resonant frequency?
  1.     A coil with large resistance
  2.     A coil with low resistance
  3.     A coil with large distributed capacitance
  4.     A coil with low distributed capacitance
 Discuss Question
Answer: Option C. ->  A coil with large distributed capacitance

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