Engine fundamentals 201a Flashcards
Development of the internal combustion engine started approximately _________ years ago
200
An internal combustion engine converts the heat energy of the fuel into ?
Useable mechanical energy and
Wasted heat
The term compression ignition refers to ?
The method of igniting fuel in a diesel engine
The term torque could best be described as a?
Rotational force
Which of the following describes the term engine displacement ?
Swept volume of one cylinder x number of cylinders
The compression ratio of a diesel engine would be ?
About two times a gasoline engine’s CR
An filter with high restriction (dirty) would ______ the volumetric efficiency of an engine
Decrease
Horsepower is a measurement of ?
The rate of doing work
An internal combustion engine dissipates approximately 60% of the heat developed by combustion through?
The cooling and exhaust systems
The term stroke refers to ?
The distance the piston moves from TDC to BDC
List in sequence the 4 events that make up one cycle of an internal combustion engine ?
Intake/compression/power/exhaust
A 4 stroke cycle engine completes all 4 events in _____ of crankshaft rotation ?
720degrees
Scavenging is a term that refers to ?
Removing exhaust gases from a cylinder
In a 4 stroke cycle engine __________ is the number of crankshaft degrees that the intake and exhaust valves are both open
Valve overlap
A 2 stroke cycle engine has a ____ power stroke than a 4 stroke cycle engine
Shorter
The camshaft of a 4 stroke cycle engine rotates at ____ crankshaft speed
One haft
On the compression stroke, a gas engine compresses ?
An air/fuel mixture
The rpm and power output of a diesel engine are controlled by regulating ?
Fuel quantity
Engines may be classified by ?
Cycle and cooling type/number and arrangement of cylinder/operational speed and type of fuel used
A turbocharger is a device that is used to ?
Increase volumetric efficiency
Using the formula, Area= bore x0.7854, calculate engine displacement for the following (round your final answers to two decimal places)
6 cylinder engine 140mm bore 152mm stroke
6 cylinder engine 5.5 inch bore 6.0 inch stroke
6 cylinder engine 130mm bore 160mm stroke
20 cylinder engine 9.0625 inch bore 10 inch stroke
14.04 L displacement ( Cummins N14 )
855.30 in q displacement ( Cummins NTC 855 )
12.74 L Displacement ( Detroit Diesel series 60 )
12 900.81 in q displacement ( General Motors EMD 645 )
