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MCQs

Total Questions : 59 | Page 6 of 6 pages
Question 51. A 75 load uses 2 W of power. The output voltage of the power supply is approximately
  1.    12 V
  2.    6 V
  3.    120 V
  4.    1.2 V
 Discuss Question
Answer: Option A. -> 12 V
Question 52. When the current through a 12 k resistor is 8 mA, the power is
  1.    768 mW
  2.    7.68 W
  3.    7.68 mW
  4.    76.8 W
 Discuss Question
Answer: Option A. -> 768 mW
Question 53. How much continuous current can be drawn from a 60 Ah battery for 14 h?
  1.    428 A
  2.    42.8 A
  3.    4.28 A
  4.    4.2 A
 Discuss Question
Answer: Option C. -> 4.28 A
Question 54. A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
  1.    226 mW
  2.    22.6 mW
  3.    13.2 mW
  4.    132 mW
 Discuss Question
Answer: Option D. -> 132 mW
Question 55. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
  1.    overheated
  2.    open
  3.    reversed
  4.    shorted
 Discuss Question
Answer: Option D. -> shorted
Question 56. A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
  1.    33
  2.    both resistors
  3.    330
  4.    neither resistor
 Discuss Question
Answer: Option D. -> neither resistor
Question 57. A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
  1.    201.6 kWh
  2.    2.01 kWh
  3.    8.4 kWh
  4.    20.16 kWh
 Discuss Question
Answer: Option A. -> 201.6 kWh
Question 58. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
  1.    8.57%
  2.    85.7%
  3.    4.28%
  4.    42.85%
 Discuss Question
Answer: Option B. -> 85.7%
Question 59. In 0.025 W, there are
  1.    25 mW
  2.    2,500 µW
  3.    25 kW
  4.    0.00025 mW
 Discuss Question
Answer: Option A. -> 25 mW

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