Lakshya Education MCQs

Question: The period of a sine wave is ___________ seconds. its frequency is
Options:
A. 20 Hz
B. 30 Hz
C. 40 Hz
D. 50 Hz
Answer: Option D

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Question 1. The period of a sine wave is ___________ seconds. its frequency is
  1.     20 Hz
  2.     30 Hz
  3.     40 Hz
  4.     50 Hz
Answer: Option D
Question 2. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 v is induced. which of the following values is indicated by the voltmeters?
  1.     220 V
  2.     220 v3 V
  3.     220/v3 V
  4.     None of the above
Answer: Option A
Question 3. The time constant of the capacitance circuit is defined as the time during which voltage
  1.     Falls to 36.8% of its final steady value
  2.     Rises to 38.6% of its final steady value
  3.     Rises to 63.2% of its final steady value
  4.     None of the above
Answer: Option C
Question 4. The form factor is the ratio of
  1.     Peak value to r.m.s. value
  2.     r.m.s. value to average value
  3.     Average value to r.m.s. value
  4.     None of the above
Answer: Option B
Question 5. The square waveform of current has following relation between r.m.s. value and average value.
  1.     r.m.s. value is equal to average value
  2.     r.m.s. value of current is greater than average value
  3.     r.m.s. value of current is less than average value
  4.     None of the above
Answer: Option A
Question 6. The time constant of the capacitance circuit is defined as the time during which voltage
  1.     Falls to 36.8% of its final steady value
  2.     Rises to 38.6% of its final steady value
  3.     Rises to 63.2% of its final steady value
  4.     None of the above
Answer: Option C

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