Engine Fundamentals Flashcards
Development of the internal combustion engine started approximately ______ years ago.
a. 50
b. 100
c. 200
e. 300
c) 200
An internal combustion engine converts the heat energy of the fuel into: a) water vapor b) usable mechanical energy c) wasted heat D) both B and C
D) both B and C
The term compression ignition refers to:
a) the method of igniting fuel in a gasoline engine
b) the method of igniting fuel in a diesel engine
c) compressing the air/fuel charge in a an engine’s cylinder.
d) reducing the time it takes for ignition to occur.
b) the method of igniting fuel in a diesel engine
The term torque is described as:
a) linear force
b) rotational force
c) measurement of power
d) sequence for tightening fasteners
b) rotational force
Which of the following describes the term engine displacement?
a) bore x stroke x number of cylinders
b) mounting restrictions due to size
c) swept volume of one cylinder x number of cylinders
d) the volume of one cylinder
c) swept volume of one cylinder x number of cylinders
The compression ratio of a diesel engine would be:
a) about four times a gasoline engine’s CR
b) less than a gasoline engine’s CR
c) the same as a gasoline engine’s CR
d) about two times a gasoline engine’s CR
d) about two times a gasonline engine’s CR
A dirty air filter with high restriction would ________ the volumetric efficiency of an engine.
a) decrease
b) increase
c) not affect
d) improve
a) decrease
Horsepower is a measurement of:
a) force
b) torque
c) the rate of doing work
d) thermal efficiency
c) the rate of doing work
An internal combustion engine dissipates approximately 60% of the heat developed by combustion through:
a) the fuel system
b) the cooling and exhaust systems
c) a blower fan system
d) block radiation
b) the cooling and exhaust systems
The term stroke refers to:
a) bore squared x .7854
b) the distance that the piston moves across the cylinder
c) the length of a connecting rod
d) the distance the piston moves from TDC to BDC
d) the distance the piston moves from TDC to BDC
List, in sequence, the four events that make up one cycle of an internal combustion engine.
a. _____________
b. _____________
c. _____________
d. _____________
a) intake
b) compression
c) power
d) exhaust
A four stroke engine completes all four events in __________ of crankshaft rotation.
a) 360
b) 720
c) one revoltuion
d) four revolutions
b) 720
Scavenging is a term that refers to:
a) removing the exhaust gas from a cylinder.
b) cleaning the crankcase of contaminants.
c) reducing exhaust emissions
d) increase inlet air pressure
a) removing exhaust gases from the cylinder.
In a four stroke engine, ____________ is the number of crankshaft degrees that the intake and exhaust valves are both open.
a) the scavenging stroke
b) the intake and exhaust stroke
c) valve overlay
d) valve overlap
d) valve overlap
A two stroke cycle engine has a ______ power stroke than a four stroke cycle engine.
a) longer
b) greater
c) shorter
d) more effective
c) shorter
