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MCQs

Total Questions : 480 | Page 7 of 48 pages
Question 61. A dielectric material is:
  1.    a good conductor
  2.    a good insulator
  3.    a poor conductor of electrostatic fields
  4.    a good conductor of magnetic fields
  5.    None of the above
 Discuss Question
Answer: Option B. -> a good insulator
Question 62. A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
  1.    0.1 A
  2.    1000 A
  3.    10:00 AM
  4.    100 A
  5.    None of the above
 Discuss Question
Answer: Option B. -> 1000 A
Question 63. If a load resistance is 1 kW, a stiff current source has a resistance of
  1.    At least 10 Ohm
  2.    Less than 10 Ohm
  3.    More than 100 k Ohm
  4.    Less than 100 k Ohm
  5.    None of the above
 Discuss Question
Answer: Option C. -> More than 100 k Ohm
Question 64. The number of free electrons and holes in intrinsic semiconductor increases when the temperature
  1.    Decreases
  2.    Increases
  3.    Stays the same
  4.    0oC
  5.    None of the above
 Discuss Question
Answer: Option B. -> Increases
Question 65. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
  1.    60 Ohm
  2.    50 Ohm
  3.    100 Ohm or more
  4.    10 Ohm
  5.    None of the above
 Discuss Question
Answer: Option C. -> 100 Ohm or more
Question 66. Which one of the following statements is true for current flowing in a parallel circuit?
  1.    The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
  2.    The same current always flows through every part of a parallel circuit
  3.    The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
  4.    The total current in a parallel circuit is always less than the smallest amount of current
  5.    None of the above
 Discuss Question
Answer: Option A. -> The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
Question 67. Doubling the number of turns of wire in an inductor:
  1.    reduces the value of inductance by one-half
  2.    multiplies the value of inductance by two
  3.    multiplies the value of inductance by four
  4.    reduces the value of inductance by one-fourth
  5.    None of the above
 Discuss Question
Answer: Option C. -> multiplies the value of inductance by four
Question 68. Holes are the minority carriers in which type of semiconductor?
  1.    Extrinsic
  2.    Intrinsic
  3.    n-type
  4.    p-type
  5.    None of the above
 Discuss Question
Answer: Option C. -> n-type
Question 69. A farad is defined as the amount of capacitance necessary for:
  1.    dissipating 1 W of power
  2.    causing an ac phase shift greater than 90 degree
  3.    storing 1 V for 1 second
  4.    changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
  5.    None of the above
 Discuss Question
Answer: Option D. -> changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
Question 70. What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?
  1.    less than 1 Ohm
  2.    1590 Ohm
  3.    312 Ohm
  4.    690 Ohm
  5.    None of the above
 Discuss Question
Answer: Option B. -> 1590 Ohm

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