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MCQs

Total Questions : 480 | Page 10 of 48 pages
Question 91. The value of a capacitor can be made larger by:
  1.    increasing the area of the plates
  2.    decreasing the area of the plates
  3.    increasing the frequency of the applied voltage
  4.    increasing the voltage applied to the plates
  5.    None of the above
 Discuss Question
Answer: Option A. -> increasing the area of the plates
Question 92. The value of a capacitor can be made larger by:
  1.    moving the plates further apart
  2.    moving the plates closer together
  3.    increasing the voltage applied to the plates
  4.    decreasing the voltage applied to the plates
  5.    None of the above
 Discuss Question
Answer: Option B. -> moving the plates closer together
Question 93. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
  1.    0.25
  2.    180
  3.    0.5
  4.    4
  5.    None of the above
 Discuss Question
Answer: Option C. -> 0.5
Question 94. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
  1.    5 Ohm
  2.    50 Ohm or more
  3.    100 Ohm
  4.    6 Ohm
  5.    None of the above
 Discuss Question
Answer: Option B. -> 50 Ohm or more
Question 95. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
  1.    Clockwise
  2.    Counterclockwise
  3.    Out of this page
  4.    Into this page
  5.    None of the above
 Discuss Question
Answer: Option B. -> Counterclockwise
Question 96. Which one of the following phrasers best describes flux density?
  1.    The concentration of lines of magnetic force
  2.    The rate of change of the number of lines of magnetic force
  3.    The opposition to a build-up of magnetic fields
  4.    The force that maintains lines of force
  5.    None of the above
 Discuss Question
Answer: Option A. -> The concentration of lines of magnetic force
Question 97. Which is the most widely used semiconductor?
  1.    Copper
  2.    Silicon
  3.    Germanium
  4.    All of the above
  5.    None of the above
 Discuss Question
Answer: Option B. -> Silicon
Question 98. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?
  1.    1750 mA
  2.    17.5 mA
  3.    175 mA
  4.    1.75 mA
  5.    None of the above
 Discuss Question
Answer: Option B. -> 17.5 mA
Question 99. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
  1.    Doping
  2.    Valence electrons
  3.    Free electrons
  4.    Thermal energy
  5.    None of the above
 Discuss Question
Answer: Option D. -> Thermal energy
Question 100. Which one of the following statements is true?
  1.    Power dissipation of a pure inductor decreases with operating frequency
  2.    Power dissipation of a pure inductor is at a maximum for dc source voltages
  3.    Power dissipation of a pure inductor increases with operating frequency
  4.    There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency
  5.    None of the above
 Discuss Question
Answer: Option D. -> There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency

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