Lakshya Education MCQs

Question: The phase difference between voltage and current wave through a circuit element is given as 30°. the essential condition is that
Options:
A. Both waves must have same frequency
B. Both waves must have identical peak values
C. Both waves must have zero value at the same time
D. None of the above
Answer: Option A

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More Questions on This Topic :

Question 1. 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
Answer: Option D
Question 2. 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
Answer: Option C
Question 3. 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
Answer: Option B
Question 4. 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
Answer: Option B
Question 5. Time constant of an inductive circuit
  1.     Increases with increase of inductance and decrease of resistance
  2.     Increases with the increase of inductance and the increase of resistance
  3.     Increases with the decrease of inductance and decrease of resistance
  4.     Increases with decrease of inductance and increase of resistance
Answer: Option A
Question 6. 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
Answer: Option D

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