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MCQs

Total Questions : 327 | Page 25 of 33 pages
Question 241. The r.m.s. value and mean value is the same in the case of___________?
  1.    triangular wave
  2.    sine wave
  3.    square wave
  4.    half wave rectified sine wave
 Discuss Question
Answer: Option C. -> square wave
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 242. For a sine wave with peak value Imax the r.m.s. value is_______?
  1.    0.5 Imax
  2.    0.707
  3.    0.9
  4.    1.414 Lmax
 Discuss Question
Answer: Option B. -> 0.707
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 243. Form factor for a sine wave is________?
  1.    1.414
  2.    0.707
  3.    1.11
  4.    0.637
 Discuss Question
Answer: Option C. -> 1.11
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 244. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
  1.    90
  2.    60
  3.    45
  4.    30
 Discuss Question
Answer: Option C. -> 45
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 245. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 246. Capacitors for power factor correction are rated in_________?
  1.    kW
  2.    kVA
  3.    kV
  4.    kVAR
 Discuss Question
Answer: Option D. -> kVAR
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 247. For a frequency of 200 Hz, the time period will be__________?
  1.    0.05 s
  2.    0.005 s
  3.    0.0005 s
  4.    0.5 s
 Discuss Question
Answer: Option B. -> 0.005 s
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 248. Time constant of an inductive circuit___________?
  1.    increases with increase of inductance and decrease of resistance
  2.    increases with the increase of inductance and the increase of resistance
  3.    increases with decrease of inductance and decrease of resistance
  4.    increases with decrease of inductance and increase of resistance
 Discuss Question
Answer: Option A. -> increases with increase of inductance and decrease of resistance
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 249. Capacitive reactance is more when_______?
  1.    capacitance is less and frequency of supply is less
  2.    capacitance is less and frequency of supply is more
  3.    capacitance is more and frequency of supply is less
  4.    capacitance is more and frequency of supply is more
 Discuss Question
Answer: Option A. -> capacitance is less and frequency of supply is less
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 250. Poor power factor________?
  1.    reduces load handling capability of electrical system
  2.    results in more power losses in the electrical system
  3.    overloads alternators, transformers and distribution lines
  4.    results in more voltage drop in the line
  5.    results in all above
 Discuss Question
Answer: Option E. -> results in all above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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