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MCQs

Total Questions : 631 | Page 62 of 64 pages
Question 611.  
The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?
  1.    3.54 mH
  2.    7.88 mH
  3.    39.9 mH
  4.    189.3 mH
 Discuss Question
Answer: Option C. -> 39.9 mH
Question 612.  The transformer turns ratio determines
  1.    the ratio of primary and secondary voltages
  2.    the ratio of primary and secondary currents
  3.    the reflected impedance
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 613.  Increasing the number of turns of wire on the secondary of a transformer will
  1.    increase the secondary current
  2.    decrease the secondary current
  3.    have no effect on the secondary current
  4.    increase the primary current
 Discuss Question
Answer: Option B. -> decrease the secondary current
Question 614.  What is the turns ratio of the transformer needed to match a 1 komega.gif source resistance to a 160 omega.gif load?
  1.    2.5:1
  2.    0.4:1
  3.    6.25:1
  4.    16:1
 Discuss Question
Answer: Option B. -> 0.4:1
Question 615.  
A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 omega.gif load. What is the efficiency of the transformer?
  1.    88%
  2.    90%
  3.    92%
  4.    95%
 Discuss Question
Answer: Option B. -> 90%
Question 616.  Mutual induction is dependent on
  1.    winding ratios
  2.    output polarities
  3.    dc voltage levels
  4.    current changes
 Discuss Question
Answer: Option D. -> current changes
Question 617.  A special transformer used to convert unbalanced signals to balanced signals is the
  1.    balun
  2.    autotransformer
  3.    center-tapped transformer
  4.    step-across transformer
 Discuss Question
Answer: Option A. -> balun
Question 618.  If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
  1.    100 W
  2.    50 W
  3.    75 W
  4.    200 W
 Discuss Question
Answer: Option A. -> 100 W
Question 619. . A transformer turns ratio of ________ will be needed to match an output impedance of 5 komega.gif to an 8 omega.gif speaker.
  1.    5:1
  2.    8:1
  3.    25:1
  4.    625:1
 Discuss Question
Answer: Option C. -> 25:1
Question 620. . A transformer has
  1.    primary and secondary windings, both of which are considered inputs
  2.    primary and secondary windings, both of which are considered outputs
  3.    a primary winding used as an output and a secondary winding used as an input
  4.    a primary winding used as an input and a secondary winding used as an output
 Discuss Question
Answer: Option D. -> a primary winding used as an input and a secondary winding used as an output

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