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MCQs

Total Questions : 59 | Page 1 of 6 pages
Question 1. A 220 Ω resistor dissipates 3 W. The voltage is
  1.    73.3 V
  2.    2.5 V
  3.    25.7 V
  4.    257 V
 Discuss Question
Answer: Option C. -> 25.7 V
Question 2. If you used 400 W of power for 30 h, you have used
  1.    1.3 kWh
  2.    13.3 kWh
  3.    1.2 kWh
  4.    12 kWh
 Discuss Question
Answer: Option D. -> 12 kWh
Question 3. For 12 V and 40 mA, the power is
  1.    480 mW
  2.    0.480 W
  3.    480,000 µW
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 4. How many watt-hours represent 65 W used for 18 h?
  1.    11.7 Wh
  2.    1,170 Wh
  3.    11,700 Wh
  4.    117,000 Wh
 Discuss Question
Answer: Option B. -> 1,170 Wh
Question 5. Energy equals power multiplied by time.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 6. Watt's law states the relationships of power to energy.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 7. A 3.3 kΩ resistor dissipates 0.25 W. The current is
  1.    8.7 mA
  2.    87 mA
  3.    8.7 µA
  4.    8.7 A
 Discuss Question
Answer: Option A. -> 8.7 mA
Question 8. How much continuous current can be drawn from a 60 Ah battery for 14 h?
  1.    42.8 A
  2.    428 A
  3.    4.28 A
  4.    4.2 A
 Discuss Question
Answer: Option C. -> 4.28 A
Question 9. 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.    42.85 %
  3.    4.28 %
  4.    85.7 %
 Discuss Question
Answer: Option D. -> 85.7 %
Question 10. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
  1.    1.286 kWh
  2.    12.85 kWh
  3.    535 kWh
  4.    252 kWh
 Discuss Question
Answer: Option A. -> 1.286 kWh

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