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MCQs

Total Questions : 327 | Page 11 of 33 pages
Question 101. In an a.c. circuit power is dissipated in
  1.     Resistance only
  2.     Inductance only
  3.     Capacitance only
  4.     None of the above
 Discuss Question
Answer: Option A. ->  Resistance only
Question 102. The input of an a.c. circuit having power factor of 0.8 lagging is 40 kvathe power drawn by the circuit is
  1.     12 kW
  2.     22 kW
  3.     32 kW
  4.     64 kW
 Discuss Question
Answer: Option C. ->  32 kW
Question 103. Power factor of electric bulb is
  1.     Zero
  2.     Lagging
  3.     Leading
  4.     Unity
 Discuss Question
Answer: Option D. ->  Unity
Question 104. A sine wave has a frequency of 50 hz. its angular frequency is __________ radian/second.
  1.     100 n
  2.     50 jt
  3.     25 JT
  4.     5 n
 Discuss Question
Answer: Option A. ->  100 n
Question 105. Capacitive reactance is more when
  1.     Capacitance is less and frequency of supply is less
  2.     Capacitance is less and frequency of supply is more
  3.     Capacitance is more and frequency of supply is less
  4.     Capacitance is more and frequency of supply is more
 Discuss Question
Answer: Option A. ->  Capacitance is less and frequency of supply is less
Question 106. In the case of an unsymmetrical alternating current the average value must always be taken over
  1.     Unsymmetrical part of the wave form
  2.     The quarter cycle
  3.     The half cycle
  4.     The whole cycle
 Discuss Question
Answer: Option D. ->  The whole cycle
Question 107. 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 108. Power factor of the following circuit will be zero
  1.     Resistance
  2.     Inductance
  3.     Capacitance
  4.     Both B and C
 Discuss Question
Answer: Option D. ->  Both B and C
Question 109. 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 110. In a purely inductive circuit
  1.    Reactive power is zero
  2.    Apparent power is zero
  3.    None of the listed here
  4.    Actual power is zero
 Discuss Question
Answer: Option D. -> Actual power is zero

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