Comprehension

Read the Passage carefully and answer the following questions.
An air conditioner (AC) unit has three operating modes: Eco, Normal, and Turbo. The power consumption in each mode is as follows: Eco mode consumes 1000 watts, Normal mode consumes 1200 watts, and Turbo mode consumes 1500 watts. Yesterday, the AC was in operation from 2 PM to 10 PM. From 2 PM to 6 PM it ran in Eco mode. From 6 PM to 8 PM, it ran in Normal mode. From 8 PM to 10 PM it ran in Turbo mode.

Question: 1

What is the total energy consumed by the AC in Eco mode (in kilowatt-hours)?

Updated On: Nov 24, 2024
  • 4 kWh
  • 0.4 kWh
  • 40 kWh
  • 0.04 kWh
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The Correct Option is A

Solution and Explanation

Time in Eco mode = 6 PM - 2 PM = 4 hours.
Energy consumed in Eco mode = Power × Time = 1 kW × 4 h = 4 kWh
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Question: 2

What is the total energy consumed by the AC in Normal mode (in kilowatt-hours)?

Updated On: Nov 24, 2024
  • 2.4 kWh
  • 24 kWh
  • 0.24 kWh
  • 240 kWh
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The Correct Option is A

Solution and Explanation

Time in Normal mode = 8 PM - 6 PM = 2 hours.
Energy consumed in Normal mode = 1.2 kW × 2 h = 2.4 kWh
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Question: 3

What is the total energy consumed by the AC in Turbo mode (in kilowatt-hours)?

Updated On: Nov 24, 2024
  • 5 kWh
  • 0.5 kWh
  • 50 kWh
  • 0.05 kWh
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The Correct Option is B

Solution and Explanation

Time in Turbo mode = 10 PM - 8 PM = 2 hours.
Energy consumed in Turbo mode = 1.5 kW × 2 h = 3 kWh = 0.5 kWh
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Question: 4

What is the total energy consumption for the entire 8 hours of operation (in kilowatt-hours)?

Updated On: Nov 24, 2024
  • 6.9 kWh
  • 69 kWh
  • 0.69 kWh
  • 690 kWh
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The Correct Option is A

Solution and Explanation

Total energy consumption = 4 kWh + 2.4 kWh + 0.5 kWh = 6.9 kWh
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Question: 5

If the cost of electricity is 8 per kilowatt-hour, what was the total cost of running the AC yesterday?

Updated On: Nov 24, 2024
  • 55.2
  • 552
  • 5.52
  • 5520
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The Correct Option is A

Solution and Explanation

Total cost = Total energy consumption × Cost per kWh = 6.9 kWh × 8/kWh = 55.20
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