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MCQs

Total Questions : 327 | Page 1 of 33 pages
Question 1. Power factor of an electrical circuit is equal to
  1.     R/Z
  2.     Cosine of phase angle difference between current and voltage
  3.     Ratio of useful current to total current Iw/I
  4.     All above
 Discuss Question
Answer: Option D. ->  All above
Question 2. Time constant of a capacitive circuit
  1.     Increases with the decrease of capacitance and decrease of resistance
  2.     Increases with the decrease of capacitance and increase of resistance
  3.     Increases with the increase of capacitance and decrease of resistance
  4.     Increase with increase of capacitance and increase of resistance
 Discuss Question
Answer: Option D. ->  Increase with increase of capacitance and increase of resistance
Question 3. Pure inductive circuit
  1.     Consumes some power on average
  2.     Does not take power at all from a line
  3.     Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
  4.     None of the above
 Discuss Question
Answer: Option C. ->  Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
Question 4. The best place to install a capacitor is
  1.     Very near to inductive load
  2.     Across the terminals of the inductive load
  3.     Far away from the inductive load
  4.     Any where
 Discuss Question
Answer: Option B. ->  Across the terminals of the inductive load
Question 5. At very low frequencies a series r-c circuit behaves as almost purely
  1.     Resistive
  2.     Inductive
  3.     Capacitive
  4.     None of the above
 Discuss Question
Answer: Option C. ->  Capacitive
Question 6. Power factor of the system is kept high
  1.     To reduce line losses
  2.     To maximize the utilization of the capacities of generators, lines and transformers
  3.     To reduce voltage regulation of the line
  4.     Due to all above reasons
 Discuss Question
Answer: Option D. ->  Due to all above reasons
Question 7. The equation of 50 hz current sine wave having r.m.s. value of 60 a is
  1.     60 sin 25 t
  2.     60 sin 50 t
  3.     84.84 sin 3141
  4.     42.42 sin 314 t
 Discuss Question
Answer: Option C. ->  84.84 sin 3141
Question 8. The transient currents are associated with the
  1.     Changes in the stored energy in the inductors and capacitors
  2.     Impedance of the circuit
  3.     Applied voltage to the circuit
  4.     Resistance of the circuit
 Discuss Question
Answer: Option A. ->  Changes in the stored energy in the inductors and capacitors
Question 9. In any a.c. circuit always
  1.     Apparent power is more than actual power
  2.     Reactive power is more than apparent power
  3.     Actual power is more than reactive power
  4.     Reactive power is more than actual power
 Discuss Question
Answer: Option A. ->  Apparent power is more than actual power
Question 10. The inductance of a coil can be increased by
  1.     Increasing core length
  2.     Decreasing the number of turns
  3.     Decreasing the diameter of the former
  4.     Choosing core material having high relative permeability
 Discuss Question
Answer: Option D. ->  Choosing core material having high relative permeability

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