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MCQs

Total Questions : 61 | Page 3 of 7 pages
Question 21. To increase the current in a series RL circuit, the frequency
  1.    Should be increased
  2.    Should be decreased
  3.    Should be constant
  4.    Cannot be determined without values
 Discuss Question
Answer: Option B. -> Should be decreased
Question 22. When the frequency is decreased, the impedance of a parallel RL circuit Increases
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 23. The resistor voltage in an RL circuit is always out of phase with the current.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 24. When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
  1.    Decreases
  2.    Increases
  3.    Does not change
  4.    Cannot be determined without values
 Discuss Question
Answer: Option B. -> Increases
Question 25. The impedance of an RL circuit varies inversely with frequency.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 26. Which of the following power factors results in less energy loss in an RL circuit?
  1.    1
  2.    0.8
  3.    0.4
  4.    0.2
 Discuss Question
Answer: Option D. -> 0.2
Question 27. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
  1.    6 A
  2.    424 mA
  3.    4.24 A
  4.    42.4 A
 Discuss Question
Answer: Option C. -> 4.24 A
Question 28. A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is
  1.    12.60 ∠-76° mS
  2.    12.18 ∠76° mS
  3.    218 ∠-76° mS
  4.    12.18 ∠-76° mS
 Discuss Question
Answer: Option D. -> 12.18 ∠-76° mS
Question 29. A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 30. A 470Ω resistor and a coil with 125Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
  1.    152 mA
  2.    12 mA
  3.    32 mA
  4.    120 mA
 Discuss Question
Answer: Option D. -> 120 mA

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