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MCQs

Total Questions : 59 | Page 2 of 6 pages
Question 11. A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
  1.    1 h
  2.    200 h
  3.    2,000 h
  4.    10 h
 Discuss Question
Answer: Option C. -> 2,000 h
Question 12. The capacity of a battery is measured in milli-amperes.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 13. A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
  1.    4.8 W
  2.    150 mW
  3.    15 mW
  4.    480 mW
 Discuss Question
Answer: Option B. -> 150 mW
Question 14. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
  1.    938 Wh
  2.    0.938 Wh
  3.    56.25 Wh
  4.    5.6 Wh
 Discuss Question
Answer: Option B. -> 0.938 Wh
Question 15. If it takes 400 ms to use 12,000 J of energy, the power is
  1.    30 kW
  2.    30 W
  3.    3 W
  4.    300 kW
 Discuss Question
Answer: Option A. -> 30 kW
Question 16. A half-watt is equal to how many milliwatts?
  1.    5,000 mW
  2.    5 mW
  3.    500 mW
  4.    50 mW
 Discuss Question
Answer: Option C. -> 500 mW
Question 17. In 40 kW, there are
  1.    0.4 mW
  2.    40,000 W
  3.    400 W
  4.    5,000 W
 Discuss Question
Answer: Option B. -> 40,000 W
Question 18. The joule is a unit of energy.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 19. Energy is equal to power multiplied by voltage.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 20. A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is
  1.    0.58 Ah
  2.    2.1 Ah
  3.    21 Ah
  4.    58 Ah
 Discuss Question
Answer: Option C. -> 21 Ah

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