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MCQs

Total Questions : 59 | Page 3 of 6 pages
Question 21. In 0.025 W, there are
  1.    25 kW
  2.    0.00025 mW
  3.    2,500 µW
  4.    25 mW
 Discuss Question
Answer: Option D. -> 25 mW
Question 22. Three hundred joules of energy are consumed in 15 s. The power is
  1.    2,000 W
  2.    2 W
  3.    20 W
  4.    200 W
 Discuss Question
Answer: Option C. -> 20 W
Question 23. A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
  1.    132 mW
  2.    13.2 mW
  3.    22.6 mW
  4.    226 mW
 Discuss Question
Answer: Option A. -> 132 mW
Question 24. A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
  1.    33 Ω
  2.    330 Ω
  3.    Both resistors
  4.    Neither resistor
 Discuss Question
Answer: Option D. -> Neither resistor
Question 25. A battery is one type of power supply that converts chemical energy into electrical energy.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 26. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
  1.    Overheated
  2.    Shorted
  3.    Open
  4.    Reversed
 Discuss Question
Answer: Option B. -> Shorted
Question 27. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
  1.    2 W
  2.    1 W
  3.    5 W
  4.    0.5 W
 Discuss Question
Answer: Option A. -> 2 W
Question 28. A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
  1.    120 V
  2.    1.2 V
  3.    12 V
  4.    6 V
 Discuss Question
Answer: Option C. -> 12 V
Question 29. 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.    20.16 kWh
  2.    201.6 kWh
  3.    2.01 kWh
  4.    8.4 kWh
 Discuss Question
Answer: Option B. -> 201.6 kWh
Question 30. When the current through a 12 kΩ resistor is 8 mA, the power is
  1.    7.68 mW
  2.    768 mW
  3.    7.68 W
  4.    76.8 W
 Discuss Question
Answer: Option B. -> 768 mW

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