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11-16

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Which of the items below is a measurement of the usable horsepower at the engine crankshaft?
a.
Indicated horsepower.
b.
Net horsepower.
c.
Brake horsepower.
d.
Gross horsepower.
 

 2. 

After subtracting various losses to friction, exhaust, etc., what percent of the fuel’s heat energy is left to do useful work?
a.
16
c.
35
b.
20
d.
47
 

True/False
Indicate whether the statement is true or false.
 

 3. 

Thermal efficiency generally ranges from 20-30%.
 

 4. 

Cylinder bore is measured from top to bottom.
 

 5. 

Engine displacement is stated in TDC (Total Displacement Cubic).
 

 6. 

Gasoline engine compression pressures are typically higher than those of diesel engines.
 

 7. 

Work = distance moved ´ elapsed time.
 

 8. 

The prony brake was the forerunner of today's antilock braking systems.
 

 9. 

Approximately 20 to 30 percent of an engine's power is lost to friction.
 

Matching
 
 
Match the following terms and identifying phrases.
a.
volumetric efficiency
b.
mechanical efficiency
c.
thermal efficiency
 

 10. 

Compares brake hp and indicated hp.
 

 11. 

Ratio of air actually drawn into cylinder to maximum possible air that could enter.
 

 12. 

Found by comparing fuel burned with horsepower output.
 

Completion
Complete each statement.
 

 13. 

A chassis ______________________________ measures the horsepower delivered to the vehicle's drive wheels.
 

 

 14. 

______________________________ is a measure of an engine’s ability to do work.
 

 

 15. 

An engine cylinder has maximum volume when the piston is at ______________________________.
 

 

 16. 

The distance a piston moves in the cylinder is called its ______________________________.
 

 

 17. 

Lifting 33,000 pounds a distance of one foot in one minute is equal to one ______________________________.
 

 

 18. 

Piston ______________________________ is the volume the piston moves as it travels from BDC to TDC.
 

 

 19. 

The amount of power available to move a car is called its ______________________________ horsepower.
 

 

 20. 

Compression ______________________________ is a comparison of cylinder volumes with the piston at TDC and BDC.
 

 



 
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