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MCQs

Total Questions : 480 | Page 2 of 48 pages
Question 11. The net charge of a neutral copper atom is
  1.    0
  2.    1
  3.    -1
  4.    4
  5.    None of the above
 Discuss Question
Answer: Option B. -> 1
Question 12. A low-pass filter:
  1.    passes lower-frequency signals and reduces higher-frequency signals
  2.    passes higher-frequency signals and reduces lower-frequency signals
  3.    has no effect on ac signals
  4.    reduces the level of all frequencies by a significant amount
  5.    None of the above
 Discuss Question
Answer: Option A. -> passes lower-frequency signals and reduces higher-frequency signals
Question 13. Which one of the following statements is true for the voltage in a parallel RL circuit?
  1.    The voltage always has the same amplitude and phase for every part of the circuit
  2.    The total voltage is equal to the sum of the voltages across the resistance and inductance
  3.    The total voltage lags the total current by less than 90
  4.    The total voltages is less than the sum of the voltages across the resistance and inductance
  5.    None of the above
 Discuss Question
Answer: Option A. -> The voltage always has the same amplitude and phase for every part of the circuit
Question 14. What is one important thing transistors do?
  1.    Emit light
  2.    Amplify weak signals
  3.    Regulate voltage
  4.    Rectify line voltage
  5.    None of the above
 Discuss Question
Answer: Option B. -> Amplify weak signals
Question 15. At room temperature an intrinsic silicon crystal acts approximately like
  1.    a battery
  2.    a conductor
  3.    an insulator
  4.    a piece of copper wire
  5.    None of the above
 Discuss Question
Answer: Option C. -> an insulator
Question 16. What is the algebraic sum of this series of values:+2, -3, -6,+4?
  1.    -6
  2.    -3
  3.    0
  4.    2
  5.    None of the above
 Discuss Question
Answer: Option B. -> -3
Question 17. When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:
  1.    parallel RL circuit
  2.    parallel RC circuit
  3.    parallel RLC circuit operated above its resonant frequency
  4.    purely resistive circuit
  5.    None of the above
 Discuss Question
Answer: Option A. -> parallel RL circuit
Question 18. What causes the depletion layer?
  1.    Doping
  2.    Recombination
  3.    Barrier potential
  4.    Ions
  5.    None of the above
 Discuss Question
Answer: Option C. -> Barrier potential
Question 19. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
  1.    700 V
  2.    707 V
  3.    651 V
  4.    208 V
  5.    None of the above
 Discuss Question
Answer: Option C. -> 651 V
Question 20. Which one of the following statements most accurately reflects the nature of ac power?
  1.    The current in an ac circuit flows in one direction, but changes value periodically
  2.    The current in an ac circuit flows in one direction at a steady level
  3.    The current in an ac circuit changes direction periodically
  4.    The current in an ac circuit flows in two directions at the same time
  5.    None of the above
 Discuss Question
Answer: Option C. -> The current in an ac circuit changes direction periodically

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