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MCQs

Total Questions : 327 | Page 8 of 33 pages
Question 71. The phase difference between voltage and current wave through a circuit element is given as 30°. the essential condition is that
  1.     Both waves must have same frequency
  2.     Both waves must have identical peak values
  3.     Both waves must have zero value at the same time
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Both waves must have same frequency
Question 72. Capacitive susceptance is a measure of
  1.     Reactive power in a circuit
  2.     The extent of neutralization of reactive power in a circuit
  3.     A purely capacitive circuit's ability to pass current
  4.     A purely capacitive circuit's ability to resist the flow of current
 Discuss Question
Answer: Option C. ->  A purely capacitive circuit's ability to pass current
Question 73. A heater is rated as 230 v, 10 kw, a.c. the value 230 v refers to
  1.     Average voltage
  2.     r.m.s. voltage
  3.     Peak voltage
  4.     None of the above
 Discuss Question
Answer: Option B. ->  r.m.s. voltage
Question 74. 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 75. The double energy transient occur in the
  1.     Purely inductive circuit
  2.     R-L circuit
  3.     R-C circuit
  4.     R-L-C circuit
 Discuss Question
Answer: Option D. ->  R-L-C circuit
Question 76. 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 77. 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 78. In a series resonant circuit, the impedance of the circuit is
  1.     Minimum
  2.     Maximum
  3.     Zero
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Minimum
Question 79. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
  1.     Will change the maximum value of current at resonance
  2.     Will change the resonance frequency
  3.     Will change the impedance at resonance frequency
  4.     Will increase the selectivity of the circuit
 Discuss Question
Answer: Option D. ->  Will increase the selectivity of the circuit
Question 80. Form factor is the ratio of
  1.     Average value/r.m.s. value
  2.     Average value/peak value
  3.     r.m.s. value/average value
  4.     r.m.s. value/peak value
 Discuss Question
Answer: Option C. ->  r.m.s. value/average value

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