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MCQs

Total Questions : 227 | Page 14 of 23 pages
Question 131. A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
  1.    16 V
  2.    None of these
  3.    15 V
  4.    8 V
  5.    7.5 V
 Discuss Question
Answer: Option C. -> 15 V
Question 132. Positive ions are atoms that have
  1.    Lost an electron
  2.    Gained a proton
  3.    None of these
  4.    Gained an electron
  5.    Lost a proton
 Discuss Question
Answer: Option A. -> Lost an electron
Question 133. If the base supply voltage increases, the Q point moves
  1.    off the load line
  2.    up
  3.    nowhere
  4.    None of these
  5.    down
 Discuss Question
Answer: Option E. -> down
Question 134. At room temperature an intrinsic semiconductor has
  1.    None of these
  2.    No holes
  3.    a few free electrons and holes
  4.    many holes
  5.    many free electrons
 Discuss Question
Answer: Option C. -> a few free electrons and holes
Question 135. What is the difference between a conductor and an insulator?
  1.    An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
  2.    A conductor allows current to flow much easier than an insulator does
  3.    The difference between conductors and insulators depends on how they are used
  4.    An insulator allows current to flow much easier than a conductor does
  5.    None of these
 Discuss Question
Answer: Option B. -> A conductor allows current to flow much easier than an insulator does
Question 136. Which one of the following is a statement of Kirchhoffs current law?
  1.    The algebraic sum of currents entering and leaving a point is equal to zero
  2.    The algebraic sum of currents in a loop is equal to zero
  3.    None of these
  4.    The current through a resistance is proportional to the value of resistance and the IR drop across it
  5.    The total current in a parallel circuit is less than the value of the smallest current
 Discuss Question
Answer: Option B. -> The algebraic sum of currents in a loop is equal to zero
Question 137. A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?
  1.    20 mW
  2.    10 mW
  3.    200 mW
  4.    300 mW
  5.    None of these
 Discuss Question
Answer: Option C. -> 200 mW
Question 138. Which is the most widely used semiconductor?
  1.    All of these
  2.    Germanium
  3.    Copper
  4.    None of these
  5.    Silicon
 Discuss Question
Answer: Option E. -> Silicon
Question 139. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?
  1.    175 mA
  2.    1750 mA
  3.    1.75 mA
  4.    None of these
  5.    17.5 mA
 Discuss Question
Answer: Option E. -> 17.5 mA
Question 140. Which one of the following phrasers best describes flux density?
  1.    The force that maintains lines of force
  2.    The concentration of lines of magnetic force
  3.    The opposition to a build-up of magnetic fields
  4.    None of these
  5.    The rate of change of the number of lines of magnetic force
 Discuss Question
Answer: Option B. -> The concentration of lines of magnetic force

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