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MCQs

Total Questions : 330 | Page 29 of 33 pages
Question 281. . What is the reactance value for a capacitor installed in a dc circuit?
  1.    zero
  2.    moderate
  3.    infinite
  4.    cannot tell
 Discuss Question
Answer: Option C. -> infinite
Question 282. . What is wrong with a leaky capacitor?
  1.    It is open.
  2.    It is shorted.
  3.    The dielectric resistance has increased.
  4.    The dielectric resistance has decreased.
 Discuss Question
Answer: Option D. -> The dielectric resistance has decreased.
Question 283. . What is the value of a capacitor labeled 102?
  1.    10,000 pF
  2.    1000 pF
  3.    1000 mu.gifF
  4.    10,000 mu.gifF
 Discuss Question
Answer: Option B. -> 1000 pF
Question 284. . If the dielectric constant of a capacitor is decreased, then its capacitance will:
  1.    increase
  2.    decrease
  3.    remain the same
  4.    be destroyed
 Discuss Question
Answer: Option B. -> decrease
Question 285. . What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?
  1.    37.8 V
  2.    38 V
  3.    63 V
  4.    101 V
 Discuss Question
Answer: Option C. -> 63 V
Question 286. . 
Power stored from the source and then returned to the source is called:
  1.    apparent power
  2.    impedance power
  3.    reactive power
  4.    true power
 Discuss Question
Answer: Option C. -> reactive power
Question 287. . What is the dielectric constant for ceramic?
  1.    between 6 and 8000
  2.    5.0
  3.    between 5 and 1000
  4.    3000
 Discuss Question
Answer: Option A. -> between 6 and 8000
Question 288. . Capacitor value markings are usually:
  1.    alphanumeric
  2.    color dabs
  3.    standard
  4.    white print
 Discuss Question
Answer: Option A. -> alphanumeric
Question 289. . A source voltage across a capacitor will:
  1.    lead the current by 90 degrees
  2.    lead the current by 180 degrees
  3.    lag the current by 90 degrees
  4.    lag the current by 180 degrees
 Discuss Question
Answer: Option C. -> lag the current by 90 degrees
Question 290. . Which material has the highest dielectric strength?
  1.    Air
  2.    Paper
  3.    Mica
  4.    Oil
 Discuss Question
Answer: Option C. -> Mica

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