30 Questions
Which unit is used to measure engine speed?
RPM
What is the formula for torque?
Force times distance
What is the relationship between torque and lever arm?
The longer the lever arm, the greater the torque
What is the most common unit of engine power in the U.S.?
Horsepower
What is indicated horsepower?
The total horsepower developed on the pistons
What is BMEP?
A measure of torque per unit of displacement
What happens to fuel consumption as BMEP is increased?
Fuel consumption decreases
Which type of engine may have a better life expectancy than a naturally aspirated engine?
Engines with high BMEP
What is the purpose of a dynamometer?
To measure engine torque
What is Brake Specific Fuel Consumption (BSFC)?
The quantity of fuel burned to produce one brake horsepower for one hour
What is the purpose of the lug torque curve?
To show the relationship between torque and engine speed
What happens when an engine operating at or near full load rpm is subjected to a load greater than full load?
The engine slows down and produces less torque
What type of loading is common in road vehicles?
Acceleration loading
What is the potential torque increase for modern, medium-speed, turbocharged, aftercooled diesels under lug conditions?
Approximately 20 to 50 percent
Which axis represents pressure on a Pressure Time (PT) curve?
Vertical axis
At what point does pressure reach its maximum on a PT curve?
Top Center (TC)
When does fuel injection typically begin on a PT curve?
During ignition delay
What is the net work produced by combustion represented by on a PT curve?
The volume between the two curves
What is the term for the diameter of each cylinder in an engine?
Bore
What is the term for the distance a piston travels up and down within a cylinder?
Stroke
What is the term for the volume of air which the piston displaces as it moves one stroke?
Displacement
What is the term for the relationship between the minimum and maximum volumes between the piston crown and the cylinder head?
Compression ratio
What is the term for the measurement of engine power?
Horsepower (hp)
Which one of these statements is true about the bore and stroke in an engine?
The bore is determined by the crankshaft radius.
What determines the length of the stroke in an engine?
The shape of the crankshaft.
What connects the crankshaft to the piston in an engine?
The connecting rod.
What is the stroke in an engine if the crank radius is 5 inches?
10 inches.
What is the formula for calculating bore area in an engine?
Bore Area = (3.14 x bore squared)/4
What is the formula for calculating displacement per cylinder in an engine?
Displacement per Cylinder = Bore Area x Stroke
What is the compression ratio if the minimum volume in the cylinder is 5 cubic inches and the maximum volume is 25 cubic inches?
10:1
Test your knowledge on BMEP and its correlation to engine life and performance in this quiz. Discover the factors that contribute to engine longevity and learn how high BMEP engines can outperform their low BMEP counterparts. Challenge your understanding of engine design and power production with this insightful quiz.
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