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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. The phosphors for which of the following pair are 180° out of phase for vl, vc and vr?
  1.     VC and VR
  2.     VL and VR
  3.     VC and VL
  4.     None of the above
Answer: Option C

Question 3. 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

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. 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

Question 6. 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