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MCQs

Total Questions : 480 | Page 6 of 48 pages
Question 51. Which one of the following statements is true for the voltages in a series 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 is less than the sum of the voltages across the resistance and capacitance
  4.    The total voltage is greater than the sum of the voltages across the resistance and capacitance
  5.    None of the above
 Discuss Question
Answer: Option C. -> The total voltage is less than the sum of the voltages across the resistance and capacitance
Question 52. A battery is a device composed of one or more:
  1.    chemical cells
  2.    voltage generators
  3.    solar cells
  4.    piezoeletric cells
  5.    None of the above
 Discuss Question
Answer: Option A. -> chemical cells
Question 53. How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
  1.    0.02 A
  2.    0.955 A
  3.    10:00 AM
  4.    2.02 A
  5.    None of the above
 Discuss Question
Answer: Option B. -> 0.955 A
Question 54. Doubling the operating voltage of a purely capacitive circuit:
  1.    has no effect on the capacitive reactance
  2.    doubles the amount of capacitive reactance
  3.    multiplies the capacitive reactance by 7
  4.    cuts the capacitive reactance in half
  5.    None of the above
 Discuss Question
Answer: Option A. -> has no effect on the capacitive reactance
Question 55. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
  1.    250 µA
  2.    350 µA
  3.    0.25 µA
  4.    300 µA
  5.    None of the above
 Discuss Question
Answer: Option A. -> 250 µA
Question 56. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
  1.    180 degree
  2.    30 degree
  3.    45 degree
  4.    75 degree
  5.    None of the above
 Discuss Question
Answer: Option C. -> 45 degree
Question 57. Molecule is
  1.    The smallest particle of a substance that retains the properties of that substance
  2.    A atom that has a shortage of electrons in its outer orbit
  3.    A atom that has an excessive number of electrons in its outer orbit
  4.    A atom that flows whenever there is an imbalance of electrical charges between two points
  5.    None of the above
 Discuss Question
Answer: Option A. -> The smallest particle of a substance that retains the properties of that substance
Question 58. What form of energy is used for creating static electricity?
  1.    Solar energy
  2.    Mechanical energy
  3.    Chemical energy
  4.    Light energy
  5.    None of the above
 Discuss Question
Answer: Option D. -> Light energy
Question 59. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
  1.    0.17 V
  2.    10.17 V
  3.    20 V
  4.    18.8 V
  5.    None of the above
 Discuss Question
Answer: Option A. -> 0.17 V
Question 60. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
  1.    3.75 mA
  2.    3.2 mA
  3.    0.05 mA
  4.    13 mA
  5.    None of the above
 Discuss Question
Answer: Option A. -> 3.75 mA

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