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MCQs

Total Questions : 247 | Page 25 of 25 pages
Question 241. 1.  All a.c. equipment is rated in kVA because
  1.    kVA > kW
  2.    kVA < kW
  3.    of temperature rise limitation
  4.    none of the above
 Discuss Question
Answer: Option C. -> of temperature rise limitation
Question 242. 3.  If wattmeter is normally phased and it indicates reverse reading, the current and voltage are
  1.    more than 900 out of phase
  2.    less than 90? out of phase
  3.    insufficient data
  4.    none of the above
 Discuss Question
Answer: Option B. -> less than 90? out of phase
Question 243. 4. A balanced A-connected load is converted to equivalent balanced Y load. Then
  1.    Zy = ?3 ;
  2.    ZY
  3.    Zy = 3Z6
  4.    none of the above
 Discuss Question
Answer: Option A. -> Zy = ?3 ;
Question 244. 2.  When the p.f. is improved, lagging reactive power supplied to the load
  1.    decreases
  2.    increases
  3.    remains unchanged
  4.    none of the above
 Discuss Question
Answer: Option A. -> decreases
Question 245. 5. The line currents in a 3-phase, 4-wire system are 9 L ? 60?A, 15 L 40?A and 12 L 130?A. The neutral wire current is
  1.    13.8 L 53-1?A
  2.    6.8 L ?43.5?A
  3.    36 L 110?A
  4.    none of the above
 Discuss Question
Answer: Option A. -> 13.8 L 53-1?A
Question 246. 6. If A = [_3] , then sin At is I
  1.    [sin(-40 + 2 sin(?t) ?2 sin(-4t) + 2 sin(-0]
  2.    [ 3 ?sin(-40 + sin(?t)
  3.    3 - sin(-4t) + sin(t)
  4.    2 sin(4t) + sin(t)
 Discuss Question
Answer: Option B. -> [ 3 ?sin(-40 + sin(?t)
Question 247. 3. If A = [_3] , then sin At is I
  1.    [sin(-40 + 2 sin(?t) ?2 sin(-4t) + 2 sin(-0]
  2.    [ 3 ?sin(-40 + sin(?t)
  3.    3 - sin(-4t) + sin(t)
  4.    2 sin(4t) + sin(t)
 Discuss Question
Answer: Option B. -> [ 3 ?sin(-40 + sin(?t)

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