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MCQs

Total Questions : 149 | Page 12 of 15 pages
Question 111. . Which of the following is NOT one of the three major types of fixed inductor?
  1.    air core
  2.    ferrite core
  3.    magnesium core
  4.    iron core
 Discuss Question
Answer: Option C. -> magnesium core
Question 112. . You could decrease the time constant of an RL circuit by
  1.    adding a resistor in parallel with the circuit resistance
  2.    adding an inductor in series with the circuit inductance
  3.    decreasing the amplitude of the input voltage
  4.    exchanging the position of the resistor and inductor in the circuit
 Discuss Question
Answer: Option B. -> adding an inductor in series with the circuit inductance
Question 113. . A value of "ten to the eighth power magnetic lines of force" is for the term:
  1.    field
  2.    flux
  3.    coulomb
  4.    weber
 Discuss Question
Answer: Option D. -> weber
Question 114. . Indication of transformer primary and secondary voltage relationships is accomplished by:
  1.    color-coded wires
  2.    dot notation
  3.    black, rather than gray, casings
  4.    winding ratios
 Discuss Question
Answer: Option B. -> dot notation
Question 115. . As a generator armature passes the 270 degree point, the induced voltage is:
  1.    at maximum negative
  2.    between maximum negative and zero
  3.    at maximum positive
  4.    between zero and maximum positive
 Discuss Question
Answer: Option A. -> at maximum negative
Question 116. . The unit of flux density is:
  1.    magnetomotive force
  2.    a weber
  3.    a maxwell
  4.    a tesla
 Discuss Question
Answer: Option D. -> a tesla
Question 117. . What is the name of the part inside a relay that is moved by the action of the electromagnet?
  1.    armature
  2.    conductor
  3.    contacts
  4.    solenoid
 Discuss Question
Answer: Option A. -> armature
Question 118. . If the primary of a 4:1 turns transformer dissipates 5 W, what is the secondary power?
  1.    5.0 W
  2.    1.25 pW
  3.    9.5 W
  4.    20.0 mW
 Discuss Question
Answer: Option A. -> 5.0 W
Question 119. . 
A change of one ampere per second in an inductor that induces a voltage of one volt is considered as which unit value?
  1.    a lenz
  2.    an ohm
  3.    a farad
  4.    a henry
 Discuss Question
Answer: Option D. -> a henry
Question 120. . When used as a filter, an inductor is
  1.    placed in series with the load and aids any current changes
  2.    placed in parallel with the load and aids any current changes
  3.    placed in parallel with the load and opposes any current changes
  4.    placed in series with the load and opposes any current changes
 Discuss Question
Answer: Option D. -> placed in series with the load and opposes any current changes

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