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MCQs

Total Questions : 327 | Page 3 of 33 pages
Question 21. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
  1.     Parallel
  2.     Series
  3.     Either A or B
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Parallel
Question 22. 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
Question 23. Which of the following circuit component opposes the change in the circuit voltage ?
  1.     Inductance
  2.     Capacitance
  3.     Conductance
  4.     Resistance
 Discuss Question
Answer: Option B. ->  Capacitance
Question 24. For the same peak value, which of the following wave has the least mean value?
  1.     Half wave rectified sine wave
  2.     Triangular wave
  3.     Sine wave
  4.     Square wave
 Discuss Question
Answer: Option A. ->  Half wave rectified sine wave
Question 25. In a sine wave the slope is constant
  1.     Between 0° and 90°
  2.     Between 90° and 180°
  3.     Between 180° and 270°
  4.     No where
 Discuss Question
Answer: Option D. ->  No where
Question 26. In a r-l-c circuit
  1.     Power is consumed in resistance and is equal to IR
  2.     Exchange of power takes place between inductor and supply line
  3.     Exchange of power takes place between capacitor and supply line
  4.     All above are correct
 Discuss Question
Answer: Option D. ->  All above are correct
Question 27. The voltage of domestic supply is 220 v. this figure represents
  1.     Mean value
  2.     r.m.s. value
  3.     Peak value
  4.     Average value
 Discuss Question
Answer: Option B. ->  r.m.s. value
Question 28. Inductance of coil
  1.     Is unaffected by the supply frequency
  2.     Decreases with the increase in supply frequency
  3.     Increases with the increase in supply frequency
  4.     Becomes zero with the increase in supply frequency
 Discuss Question
Answer: Option C. ->  Increases with the increase in supply frequency
Question 29. A parallel ac. circuit in resonance will
  1.     Have a high voltage developed across each inductive and capacitive section
  2.     Have a high impedance
  3.     Act like a resistor of low value
  4.     Have current in each section equal to the line current
 Discuss Question
Answer: Option B. ->  Have a high impedance
Question 30. In a purely inductive circuit
  1.     Actual power is zero
  2.     Reactive power is zero
  3.     Apparent power is zero
  4.     None of above is zero
 Discuss Question
Answer: Option A. ->  Actual power is zero

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