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MCQs

Total Questions : 109 | Page 3 of 11 pages
Question 21. 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 22. 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 23. The power is measured in terms of decibels in case of
  1.    Electronic equipment
  2.    Transformers
  3.    Current transformers
  4.    Auto transformers
 Discuss Question
Answer: Option A. -> Electronic equipment
Question 24. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces
  1.    The more heat than produced by A.C. when flowing through the same circuit
  2.    The same heat as produced by A.C. when flowing through the same circuit
  3.    The less heat than produced by A.C. flowing through the same circuit
  4.    None of the above
 Discuss Question
Answer: Option B. -> The same heat as produced by A.C. when flowing through the same circuit
Question 25. 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 26. In a three-phase supply floating neutral is undesirable because it way give rise to
  1.    High voltage across the load
  2.    Low voltage across the load
  3.    Unequal line voltages across the load
  4.    None of these
 Discuss Question
Answer: Option C. -> Unequal line voltages across the load
Question 27. Power factor of electric bulb is
  1.    Zero
  2.    Lagging
  3.    Leading
  4.    Unity
 Discuss Question
Answer: Option D. -> Unity
Question 28. The period of a wave is
  1.    The same as frequency
  2.    Time required to complete one cycle
  3.    Expressed in amperes
  4.    None of the above
 Discuss Question
Answer: Option B. -> Time required to complete one cycle
Question 29. The power factor at resonance in R-L-C parallel circuit is
  1.    Zero
  2.    0.08 lagging
  3.    0.8 leading
  4.    Unity
 Discuss Question
Answer: Option D. -> Unity
Question 30. Which of the following coil will have large resonant frequency?
  1.    A coil with large resistance
  2.    A coil with low resistance
  3.    A coil with large distributed capacitance
  4.    A coil with low distributed capacitance
 Discuss Question
Answer: Option C. -> A coil with large distributed capacitance

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