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MCQs

Total Questions : 631 | Page 63 of 64 pages
Question 621. . ___ occurs in a transformer when some of the primary flux lines pass through the air instead of the core.
  1.    Hysteresis loss
  2.    Magnetic flux leakage
  3.    Winding resistance
  4.    Winding capacitance
 Discuss Question
Answer: Option B. -> Magnetic flux leakage
Question 622. . Making the load resistance appear the same as the source's internal resistance is called _____.
  1.    maximum power transfer
  2.    reflected resistance
  3.    impedance matching
  4.    reflected load
 Discuss Question
Answer: Option C. -> impedance matching
Question 623. . To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________.
  1.    EI core
  2.    iron core
  3.    common core
  4.    CI core
 Discuss Question
Answer: Option C. -> common core
Question 624. . A step-up transformer will ___ to the secondary.
  1.    increase the current
  2.    increase the voltage
  3.    increase the power
  4.    decrease the voltage
 Discuss Question
Answer: Option B. -> increase the voltage
Question 625. . ___ is the concept of one coil inducing a voltage into another coil.
  1.    Electrical isolation
  2.    Self-inductance
  3.    Mutual inductance
  4.    Coefficient of coupling
 Discuss Question
Answer: Option C. -> Mutual inductance
Question 626. . A(n) ___ is sometimes constructed as a variable transformer.
  1.    autotransformer
  2.    center-tapped transformer
  3.    multiple-tap transformer
  4.    multiple-winding transformer
 Discuss Question
Answer: Option A. -> autotransformer
Question 627. . A(n) _____ transformer is usually used for audio or power applications.
  1.    iron-core
  2.    air-core
  3.    ferrite-core
  4.    All of the above
 Discuss Question
Answer: Option A. -> iron-core
Question 628. . A step-up transformer will ___ to the secondary.
  1.    increase the current
  2.    increase the voltage
  3.    increase the power
  4.    decrease the voltage
 Discuss Question
Answer: Option B. -> increase the voltage
Question 629. . ___ is the concept of one coil inducing a voltage into another coil.
  1.    Electrical isolation
  2.    Self-inductance
  3.    Mutual inductance
  4.    Coefficient of coupling
 Discuss Question
Answer: Option C. -> Mutual inductance
Question 630. . A(n) ___ is sometimes constructed as a variable transformer.
  1.    autotransformer
  2.    center-tapped transformer
  3.    multiple-tap transformer
  4.    multiple-winding transformer
 Discuss Question
Answer: Option A. -> autotransformer

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