Automobile Engine Efficiency Quiz

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Questions and Answers

What is the efficiency range of a steam reciprocal engine?

  • 12 – 30%
  • Up to 40%
  • Up to 95%
  • 50 – 75% (correct)

How much energy does the drive train consume in an automobile?

  • 33%
  • 4%
  • 10% (correct)
  • 6%

What is the highest efficiency percentage listed for electric engines?

  • 12 – 30%
  • Up to 40%
  • Up to 95% (correct)
  • 50 – 75%

Which component of the automobile consumes the least amount of energy?

<p>Accessories (B)</p> Signup and view all the answers

What is the primary definition of percent efficiency?

<p>The ratio of energy output to energy input (B)</p> Signup and view all the answers

What is the formula to calculate percent efficiency?

<p>Energy output / Energy input (C)</p> Signup and view all the answers

Which of the following units can be used to measure energy?

<p>Joules (D)</p> Signup and view all the answers

Why must energy input and energy output be in the same units for calculating percent efficiency?

<p>To ensure they can cancel each other during calculations (A)</p> Signup and view all the answers

What is typically the format for expressing percent efficiency?

<p>Percentage (B)</p> Signup and view all the answers

What does a percent efficiency of 100% indicate?

<p>Energy output equals energy input (D)</p> Signup and view all the answers

Flashcards

Engine Efficiency

The percentage of energy input that is converted to useful energy output.

Automobile Engine Efficiency

Internal combustion engines in automobiles have efficiencies between 12% and 30%.

Electric Engine Efficiency

Electric engines have very high efficiency, up to 95%.

Energy Consumption in Automobiles

The breakdown of energy consumed (lost) in an automobile.

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Percent Efficiency Formula

The ratio of useful energy output to total energy input, expressed in percentage.

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Efficiency

A measure of how much useful energy is produced from a given amount of energy input.

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Units in Efficiency Calculation

The units of energy input and energy output must be the same for the calculation to work correctly.

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Energy Measurement

Energy is commonly measured in joules (J) or kilojoules (kJ).

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Percent Efficiency

A percentage expressing the ratio of useful energy output to total energy input.

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Study Notes

Engine Efficiency

  • Automobile internal combustion engines have efficiency ranging from 12% to 30%.
  • Electric engines have an efficiency of up to 95%.
  • Steam reciprocal engines have efficiency between 50% and 75%.
  • Steam turbine engines have efficiency up to 40%.

Automobile Energy Consumption Breakdown

  • Exhaust system consumes 33% of the energy.
  • Cooling and heating system consumes 33% of the energy.
  • Drive train consumes 10% of the energy.
  • Accessories consume 4% of the energy.
  • Internal friction consumes 6% of the energy.
  • Useful energy for propelling the automobile is 14-30%.

Efficiency Definition

  • Efficiency is the ratio of energy output to energy input, expressed as a percentage.
  • Energy is commonly measured in joules or kilojoules.
  • Both energy input and output must use the same units for accurate calculation.

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