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MCQs

Total Questions : 109 | Page 5 of 11 pages
Question 41. A phasor is
  1.    A line which represents the magnitude and phase of an alternating quantity
  2.    A line representing the magnitude and direction of an alternating quantity
  3.    A colored tag or band for distinction between different phases of a 3-phase supply
  4.    An instrument used for measuring phases of an unbalanced 3-phase load
 Discuss Question
Answer: Option A. -> A line which represents the magnitude and phase of an alternating quantity
Question 42. At __________ frequencies the parallel R-L circuit behaves as purely resistive.
  1.    Low
  2.    Very low
  3.    High
  4.    Very high
 Discuss Question
Answer: Option D. -> Very high
Question 43. In AC. circuits, laminated iron is invariably used in order to
  1.    Reduce eddy current loss
  2.    Increase heat radiation
  3.    Make assembly cheap and easier
  4.    Reduce circuit permeability
 Discuss Question
Answer: Option A. -> Reduce eddy current loss
Question 44. 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
Question 45. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to
  1.    The big size of the inductor
  2.    The reactance of the inductor
  3.    The current flowing in the inductor
  4.    The statement given is false
 Discuss Question
Answer: Option D. -> The statement given is false
Question 46. The form factor is the ratio of
  1.    Peak value to r.m.s. value
  2.    r.m.s. value to average value
  3.    Average value to r.m.s. value
  4.    None of the above
 Discuss Question
Answer: Option B. -> r.m.s. value to average value
Question 47. 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
Question 48. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be
  1.    282.8 V
  2.    141.4 V
  3.    111 V
  4.    100 V
 Discuss Question
Answer: Option A. -> 282.8 V
Question 49. In an AC. circuit, a low value of kVAR compared with kW indicates
  1.    Low efficiency
  2.    High power factor
  3.    Unity power factor
  4.    Maximum load current
 Discuss Question
Answer: Option B. -> High power factor
Question 50. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is
  1.    4 kVAR
  2.    6 kVAR
  3.    8 kVAR
  4.    16 kVAR
 Discuss Question
Answer: Option B. -> 6 kVAR

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