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MCQs

Total Questions : 227 | Page 15 of 23 pages
Question 141. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
  1.    Free electrons
  2.    None of these
  3.    Thermal energy
  4.    Valence electrons
  5.    Doping
 Discuss Question
Answer: Option C. -> Thermal energy
Question 142. An audio transformer has a turn ratio of 9, What is its impedance ratio?
  1.    None of these
  2.    9
  3.    6
  4.    81
  5.    85
 Discuss Question
Answer: Option D. -> 81
Question 143. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
  1.    7.5 V
  2.    8 V
  3.    None of these
  4.    16 V
  5.    3 V
 Discuss Question
Answer: Option E. -> 3 V
Question 144. How many protons does the nucleus of a silicon atom contain?
  1.    29
  2.    48
  3.    14
  4.    4
  5.    None of these
 Discuss Question
Answer: Option C. -> 14
Question 145. The emitter diode is usually
  1.    Nonconducting
  2.    None of these
  3.    Reverse-biased
  4.    Operating in the breakdwon region
  5.    Forward-biased
 Discuss Question
Answer: Option E. -> Forward-biased
Question 146. 1 Microfarad is the same as:
  1.    1 million picofarads
  2.    1 million farads
  3.    None of these
  4.    1000 millifarads
  5.    1 millionth of a picofarad
 Discuss Question
Answer: Option A. -> 1 million picofarads
Question 147. Which one of the following statements is true for resistance in a parallel circuit?
  1.    The total resistance is equal to the sum of the individual resistances in a parallel circuit.
  2.    The total resistance of a parallel circuit is equal to the total voltage
  3.    The total resistance of a parallel circuit is always less than the value of the smallest resistance
  4.    The total resistance in a parallel circuit is equal to the average value of the individual resistances
  5.    None of these
 Discuss Question
Answer: Option C. -> The total resistance of a parallel circuit is always less than the value of the smallest resistance
Question 148. The direction of conventional current flow is:
  1.    from left to right
  2.    from negative to positive
  3.    from positive to negative
  4.    None of these
  5.    from neutral to positive
 Discuss Question
Answer: Option C. -> from positive to negative
Question 149. Doubling the operating frequency of a purely inductive circuit:
  1.    None of these
  2.    doubles the amount of current through the inductors
  3.    increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
  4.    has no effect on the current through the inductors
  5.    cuts the current through the inductors one-half
 Discuss Question
Answer: Option E. -> cuts the current through the inductors one-half
Question 150. The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
  1.    None of these
  2.    Same as the primary current
  3.    One-half the primary current
  4.    No more than 10% less than the primary current
  5.    Twice the primary current
 Discuss Question
Answer: Option C. -> One-half the primary current

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