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MCQs

Total Questions : 480 | Page 4 of 48 pages
Question 31. For a pure capacitor:
  1.    ac current and voltage are exactly in phase
  2.    ac current leads the voltage by 90 degree
  3.    ac current is converted to dc voltage
  4.    ac current lags the voltage by 90 degree
  5.    None of the above
 Discuss Question
Answer: Option B. -> ac current leads the voltage by 90 degree
Question 32. The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
  1.    rotor
  2.    armature
  3.    battery
  4.    commutator
  5.    None of the above
 Discuss Question
Answer: Option D. -> commutator
Question 33. In a pure inductor:
  1.    ac current leads the voltage by 90 degree
  2.    ac current and voltage are exactly in phase
  3.    ac current lags the voltage by 90 degree
  4.    ac current is converted to dc voltage
  5.    None of the above
 Discuss Question
Answer: Option C. -> ac current lags the voltage by 90 degree
Question 34. When the collector current increases, what does the current gain do?
  1.    decreases
  2.    stays the same
  3.    increases
  4.    any of the above
  5.    None of the above
 Discuss Question
Answer: Option C. -> increases
Question 35. Waveforms are graphs that show:
  1.    frequency on the vertical axis and amplitude on the horizontal axis
  2.    amplitude on the vertical axis and frequency on the horizontal axis
  3.    amplitude on the vertical axis and the passage of time on the horizontal axis
  4.    the passage of time on the vertical axis and amplitude on the horizontal axis
  5.    None of the above
 Discuss Question
Answer: Option C. -> amplitude on the vertical axis and the passage of time on the horizontal axis
Question 36. How many types of flow are there in a semiconductor?
  1.    0
  2.    1
  3.    2
  4.    3
  5.    None of the above
 Discuss Question
Answer: Option B. -> 1
Question 37. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
  1.    Ammeter
  2.    Voltmeter
  3.    Ohmmeter
  4.    Wattmeter
  5.    None of the above
 Discuss Question
Answer: Option C. -> Ohmmeter
Question 38. What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
  1.    Electronical energy
  2.    Mechanical energy
  3.    Chemical energy
  4.    Solar energy
  5.    None of the above
 Discuss Question
Answer: Option C. -> Chemical energy
Question 39. Which one of the following statements best applies to a parallel RLC circuit?
  1.    The voltage waveform for each component always has the same amplitude and phase as the applied voltage
  2.    The sum of the current is always less than the applied current
  3.    The current waveform for each component always has the same amplitude and phase as the applied current
  4.    All of the above
  5.    None of the above
 Discuss Question
Answer: Option A. -> The voltage waveform for each component always has the same amplitude and phase as the applied voltage
Question 40. The equivalent of 1 micro A is:
  1.    10000A
  2.    1000 A
  3.    one-millionth of an ampere
  4.    one million amperes
  5.    None of the above
 Discuss Question
Answer: Option C. -> one-millionth of an ampere

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