Lakshya Education MCQs

Question: The phosphors for which of the following pair are 180° out of phase for vl, vc and vr?
A. VC and VR
B. VL and VR
C. VC and VL
D. None of the above
Answer: Option C

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More Questions on This Topic :

Question 1. The r.m.s. value of pure cosine function is
  1.     0.5 of peak value
  2.     0.707 of peak value
  3.     Same as peak value
  4.     Zero
Answer: Option B
Question 2. If a sinusoidal wave has frequency of 50 hz with 30 a r.m.s. current which of the following equation represents this wave?
  1.     42.42 sin 314 t
  2.     60 sin 25 t
  3.     30 sin 50 t
  4.     84.84 sin 25 t
Answer: Option A
Question 3. 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
Answer: Option A
Question 4. The r.m.s. value of half wave rectified sine wave is 200 v. the r.m.s. value of full wave rectified ac. will be
  1.     282.8 V
  2.     141.4 V
  3.     111 V
  4.     100 V
Answer: Option A
Question 5. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
  1.     A sinusoid of the same frequency
  2.     A sinusoid of half the original frequency
  3.     A sinusoid of double the frequency
  4.     Not a sinusoid
Answer: Option A
Question 6. In an ac. circuit, a low value of kvar compared with kw indicates
  1.     Low efficiency
  2.     High power factor
  3.     Unity power factor
  4.     Maximum load current
Answer: Option B

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