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MCQs

Total Questions : 109 | Page 2 of 11 pages
Question 11. 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 all above
 Discuss Question
Answer: Option D. -> Results in all above
Question 12. In a pure resistive circuit
  1.    Current lags behind the voltage by 90°
  2.    Current leads the voltage by 90°
  3.    Current can lead or lag the voltage by 90°
  4.    Current is in phase with the voltage
 Discuss Question
Answer: Option D. -> Current is in phase with the voltage
Question 13. Capacitors for power factor correction are rated in
  1.    kW
  2.    kVA
  3.    kV
  4.    kVAR
 Discuss Question
Answer: Option D. -> kVAR
Question 14. The power consumed in a circuit element will be least when the phase difference between the current and voltage is
  1.    180°
  2.    90°
  3.    60°
  4.    0°
 Discuss Question
Answer: Option B. -> 90°
Question 15. In a circuit containing R, L and C, power loss can take place in
  1.    C only
  2.    L only
  3.    R only
  4.    All above
 Discuss Question
Answer: Option C. -> R only
Question 16. All definitions of power factor of a series R-L-C circuit are correct except
  1.    Ratio of net reactance and impedance
  2.    Ratio of kW and kVA
  3.    Ratio of J and Z
  4.    Ratio of W and VA
 Discuss Question
Answer: Option A. -> Ratio of net reactance and impedance
Question 17. 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 18. 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 19. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVAThe power drawn by the circuit is
  1.    12 kW
  2.    22 kW
  3.    32 kW
  4.    64 kW
 Discuss Question
Answer: Option C. -> 32 kW
Question 20. Which of the following refers to a parallel circuit?
  1.    The current through each element is same
  2.    The voltage across element is in proportion to it's resistance value
  3.    The equivalent resistance is greater than any one of the resistors
  4.    The current through any one element is less than the source current
 Discuss Question
Answer: Option D. -> The current through any one element is less than the source current

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