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MCQs

Total Questions : 227 | Page 7 of 23 pages
Question 61. Most AC power is obtained from:
  1.    None of these
  2.    batteries
  3.    lightning
  4.    oscillators
  5.    generators
 Discuss Question
Answer: Option D. -> oscillators
Question 62. A device that converts mechanical pressure to electrical energy is called a:
  1.    nicad cell
  2.    solar cell
  3.    photodiode
  4.    piezoelectric device
  5.    None of these
 Discuss Question
Answer: Option D. -> piezoelectric device
Question 63. Which one of the following statements is true for the voltage in a parallel RC circuit?
  1.    The total voltage is equal to the sum of the voltages across the resistance and capacitance
  2.    The voltage always has the same amplitude and phase for every part of the circuit
  3.    The total voltage leads the total current by less than 90 degree
  4.    The total voltage is less than the sum of the voltages across the resistance and capacitance
  5.    None of these
 Discuss Question
Answer: Option B. -> The voltage always has the same amplitude and phase for every part of the circuit
Question 64. The Thevenin resistance is equal in value to the
  1.    Internal resistance of a Morton circuit
  2.    Half the load resistance
  3.    Load resistance
  4.    Open-load resistance
  5.    None of these
 Discuss Question
Answer: Option C. -> Load resistance
Question 65. The direction of electron current flow is:
  1.    from negative to positive
  2.    from neutral to positive
  3.    from positive to negative
  4.    from right to left
  5.    None of these
 Discuss Question
Answer: Option A. -> from negative to positive
Question 66. The value of a capacitor can be made larger by:
  1.    None of these
  2.    increasing the area of the plates
  3.    decreasing the area of the plates
  4.    increasing the voltage applied to the plates
  5.    increasing the frequency of the applied voltage
 Discuss Question
Answer: Option B. -> increasing the area of the plates
Question 67. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
  1.    6 Ohm
  2.    None of these
  3.    100 Ohm
  4.    50 Ohm or more
  5.    5 Ohm
 Discuss Question
Answer: Option D. -> 50 Ohm or more
Question 68. Which one of the following principles best describes the basic operation of an electromagnet?
  1.    Like magnetic poles repel, while unlike poles attract
  2.    Current flowing through a conductor generates a magnetic field
  3.    Like magnetic poles attract, while unlike poles repel
  4.    None of these
  5.    Current is induced in a conductor that is moving through a magnetic field
 Discuss Question
Answer: Option B. -> Current flowing through a conductor generates a magnetic field
Question 69. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
  1.    Into this page
  2.    Out of this page
  3.    Counterclockwise
  4.    Clockwise
  5.    None of these
 Discuss Question
Answer: Option C. -> Counterclockwise
Question 70. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
  1.    None of these
  2.    0.25
  3.    180
  4.    4
  5.    0.5
 Discuss Question
Answer: Option E. -> 0.5

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