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MCQs

Total Questions : 480 | Page 3 of 48 pages
Question 21. Which one of the following principles best describes the basic operation of a generator?
  1.    Like magnetic poles repel; unlike poles attract
  2.    Current is induced in a conductor that is moving through a magnetic field
  3.    Like magnetic poles attract; unlike poles repel
  4.    Current flowing through a conductor generates a magnetic field
  5.    None of the above
 Discuss Question
Answer: Option B. -> Current is induced in a conductor that is moving through a magnetic field
Question 22. The current gain of a transistor is defined as the ratio of the collector current to the
  1.    base current
  2.    emitter current
  3.    supply current
  4.    collector current
  5.    None of the above
 Discuss Question
Answer: Option A. -> base current
Question 23. What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?
  1.    220 ohm
  2.    150 ohm
  3.    445 ohm
  4.    690 ohm
  5.    None of the above
 Discuss Question
Answer: Option B. -> 150 ohm
Question 24. The equivalent of 1 kV is:
  1.    1.00 V
  2.    1000 V
  3.    100 mV
  4.    1000 mV
  5.    None of the above
 Discuss Question
Answer: Option B. -> 1000 V
Question 25. The period of a waveform is:
  1.    the time required to complete one full cycle
  2.    the number of cycles completed in one second
  3.    the time required for the voltage to rise from 10% to 90% of the peak amplitude
  4.    equal to 0.707 times the peak amplitude
  5.    None of the above
 Discuss Question
Answer: Option A. -> the time required to complete one full cycle
Question 26. In an intrinsic semiconductor, the number of free electrons
  1.    Equals the number of holes
  2.    Is less than the number of holes
  3.    Is greater than the number of holes
  4.    Impossible to say
  5.    None of the above
 Discuss Question
Answer: Option A. -> Equals the number of holes
Question 27. A device that converts mechanical into electrical energy is?
  1.    solar cell
  2.    thermocouple
  3.    chemical cell
  4.    generator
  5.    None of the above
 Discuss Question
Answer: Option D. -> generator
Question 28. The total impedance of a parallel RLC circuit:
  1.    always increases as the applied frequency increases
  2.    is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
  3.    always decreases as the applied frequency increases
  4.    is maximum at the resonant frequency
  5.    None of the above
 Discuss Question
Answer: Option D. -> is maximum at the resonant frequency
Question 29. The rise time of a pulse waveform is the time required for the voltage to rise:
  1.    from zero to its rms value
  2.    from zero to its peak value
  3.    from 10% of the peak value to 70.7% of the peak value
  4.    from 10% of the peak value to 90% of the peak value
  5.    None of the above
 Discuss Question
Answer: Option D. -> from 10% of the peak value to 90% of the peak value
Question 30. Which one of the following kinds of materials has the lowest permeability?
  1.    A diamagnetic material
  2.    A paramagnetic material
  3.    A feiTomagnetic material
  4.    All of the above
  5.    None of the above
 Discuss Question
Answer: Option A. -> A diamagnetic material

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