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MCQs

Total Questions : 327 | Page 5 of 33 pages
Question 41. 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 42. 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 43. In a pure inductive circuit
  1.     The current is in phase with the voltage
  2.     The current lags behind the voltage by 90°
  3.     The current leads the voltage by 90°
  4.     The current can lead or lag by 90°
 Discuss Question
Answer: Option B. ->  The current lags behind the voltage by 90°
Question 44. 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 45. Which of the following statements pertains to resistors only?
  1.     Can dissipate considerable amount of power
  2.     Can act as energy storage devices
  3.     Connecting them in parallel increases the total value
  4.     Oppose sudden changes in voltage
 Discuss Question
Answer: Option A. ->  Can dissipate considerable amount of power
Question 46. The ratio of active power to apparent power is known as factor.
  1.     Demand
  2.     Load
  3.     Power
  4.     Form
 Discuss Question
Answer: Option C. ->  Power
Question 47. Inductance affects the direct current flow
  1.     Only at the time of turning off
  2.     Only at the time of turning on
  3.     At the time of turning on and off
  4.     At all the time of operation
 Discuss Question
Answer: Option C. ->  At the time of turning on and off
Question 48. The time constant of a series r-c circuit is given by
  1.     R/C
  2.     RC2
  3.     RC
  4.     R2C
 Discuss Question
Answer: Option C. ->  RC
Question 49. 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 50. In a series l-c circuit at the resonant frequency the
  1.     Current is maximum
  2.     Current is minimum
  3.     Impedance is maximum
  4.     Voltage across C is minimum
 Discuss Question
Answer: Option A. ->  Current is maximum

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