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MCQs

Total Questions : 327 | Page 28 of 33 pages
Question 271. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
  1.    be reduced by half
  2.    be doubled
  3.    be four times as high
  4.    be reduced to one fourth
 Discuss Question
Answer: Option B. -> be doubled
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 272. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
  1.    be reduced by half
  2.    be doubled
  3.    be four times at high
  4.    be reduced to one fourth
 Discuss Question
Answer: Option A. -> be reduced by half
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 273. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
  1.    the current through the resistance is more
  2.    the current through the resistance is less
  3.    both resistance and inductance carry equal currents
  4.    none of the above
 Discuss Question
Answer: Option C. -> both resistance and inductance carry equal currents
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 274. The product of apparent power and cosine of the phase angle between circuit voltage and current is
  1.    true power
  2.    reactive power
  3.    volt-amperes
  4.    instantaneous power
 Discuss Question
Answer: Option A. -> true power
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 275. The power factor of a D.C. circuit is always__________?
  1.    less than unity
  2.    unity
  3.    greater than unity
  4.    zero
 Discuss Question
Answer: Option B. -> unity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 276. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
  1.    60 sin 25 t
  2.    60 sin 50 t
  3.    84.84 sin 3141
  4.    42.42 sin 314 t
 Discuss Question
Answer: Option C. -> 84.84 sin 3141
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 277. 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 in¬crease 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 278. The r.m.s. value of pure cosine function is_________?
  1.    0.5 of peak value
  2.    0.707 of peak value
  3.    same as peak value
  4.    zero
 Discuss Question
Answer: Option B. -> 0.707 of peak value
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 279. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 280. The frequency of an alternating current is____________?
  1.    the speed with which the alternator runs
  2.    the number of cycles generated in one minute
  3.    the number of waves passing through a point in one second
  4.    the number of electrons passing through a point in one second
 Discuss Question
Answer: Option C. -> the number of waves passing through a point in one second
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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