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MCQs

Total Questions : 149 | Page 10 of 15 pages
Question 91. . Reactance in an inductive circuit will:
  1.    increase with frequency
  2.    decrease with frequency
  3.    be independent from frequency
  4.    depend on the value of XC
 Discuss Question
Answer: Option A. -> increase with frequency
Question 92. . A turns ratio of 5 for a transformer implies:
  1.    more primary turns than secondary turns
  2.    more secondary current than primary current
  3.    larger source impedance than load impedance
  4.    more secondary turns than primary turns
 Discuss Question
Answer: Option D. -> more secondary turns than primary turns
Question 93. . A practical inductor
  1.    has inductance
  2.    has winding resistance
  3.    has winding capacitance
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 94. . When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is
  1.    a lenz
  2.    an ohm
  3.    a farad
  4.    a henry
 Discuss Question
Answer: Option D. -> a henry
Question 95. . When a coil collapses the induced circuit current will:
  1.    be in the same direction
  2.    go to zero
  3.    aid counter emf buildup
  4.    be in the opposite direction
 Discuss Question
Answer: Option A. -> be in the same direction
Question 96. . What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?
  1.    10 seconds
  2.    8 seconds
  3.    4 seconds
  4.    2 seconds
 Discuss Question
Answer: Option A. -> 10 seconds
Question 97. . When current in an inductor starts to change, it cannot react instantly due to:
  1.    fixed coil resistance
  2.    eddy current generation
  3.    applied emf of the circuit
  4.    the counter emf of the coil
 Discuss Question
Answer: Option D. -> the counter emf of the coil
Question 98. . A utility pole transformer used to supply a residential customer with two phases uses:
  1.    two phases on the primary
  2.    a center tap on the secondary
  3.    a separate ground for each phase
  4.    a small coefficient of coupling
 Discuss Question
Answer: Option B. -> a center tap on the secondary
Question 99. . If you wanted to decrease the inductance of a coil, you might increase the:
  1.    number of turns
  2.    permeability of the core
  3.    spacing between turns
  4.    area of the coil
 Discuss Question
Answer: Option C. -> spacing between turns
Question 100. . What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 omega.gif, and the inductor is rated at 24 mH?
  1.    79.9 mA
  2.    126.4 mA
  3.    173.0 mA
  4.    198.6 mA
 Discuss Question
Answer: Option C. -> 173.0 mA

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