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WorksheetsSmall Engines Final
Total questions: 39
Worksheet time: 25mins
What is required at all times to go into the shop?
safety classes
a positive mental attitude
gloves
a smock
What danger does running an engine inside the shop present that requires students to open a window?
Carbon monoxide poisoning
bruising from a falling engine
a gas explosion
slipping on an oil spill
What is the proper way to dispose of oily rags?
in an oil waste bin with vented bottom and self-closing lid
in the trash can
in a bin of water
outside
What kind of fire is a Class C fire?
Electrical Fires
Combustible Metal fires
Regular fires
Combustible Liquids Fires
Name the four strokes of the 4 cycle engine in order.
(a)
In one cycle of an engine how many times does the crankshaft rotate?
2
1
4
none
Why does the flywheel have to be so heavy?
It helps provide inertia to keep the engine going
engines are sold by the pound
it helps slow the engine to a stop
magnets are heavy and the flywheel has 1 or more
How does the electrical system provide a spark without a battery?
Induction theory: the spark is created when a magnet passes the ignition amiture
Bernoulli's Principle, the spark is sucked up by fluid dynamics
The Venturi effect creates a spark
it does have a battery
What are the three sections of the Model number?
Model, Type, Code
Serial number, sales number, date
Make, Model, Decal
the model number has just one part
What does the Code section of the model number refer to?
Year, mouth, date the engine was made and the factory and assembly line that created it
the orientation of the crankshaft
the serial number
the size of the piston
Where is the most common spot to find the model number on small engines?
on the valve head cover
on the flywheel
on the crankcase base
on the fuel tank
Why is it so important to torque certain bolts on the engine to their specific torque requirement?
Write at least two complete sentences to get credit.
What is torque?
a rotating force
Pressure per square in
rotations per minute
a pulling force
Why do valves rotate as they open and close?
to clean off the carbon build up
to provide extra torque to the engine
to assist in bringing in fresh air
the springs naturally do this
What would happen if all the piston rings were aligned?
oil would get into the combustion chamber and blue smoke would appear in the exhaust
the engine would die
nothing
the engine will run smoothly
If your engine is running rich there will be black smoke.
True
False
If your engine is running lean there will be white smoke.
True
False
The intake valve is typically larger.
True
False
The intake valve typically has the larger air gap.
true
false
Why is gasoline not really the best fuel?
It has a low octane and high knocking index rating
it is cut with ethanol and lead
It has a high octane and low knocking index rating
it doesn't combust unless a lot of pressure is applied
What allows gas to come into the throat of the carburetor from the fuel bowl?
Bernoulli's Principle
the Venturi effect
Induction Theory
Four-Stroke Theory
What does the idle circuit do?
allows a little fuel/air mixture to bypass the throttle plate to maintain the engine
to mix the gas and air together
makes gas come up to the carburetor from the fuel bowl
Creates a vacuum in the combustion chamber
Why do we have a choke on our engines before we start them?
Engines need a little more gas than air to get started, once starting you can increase air
Engines need a lot of air to get started
to ensure we flood the engine every time
To mix up the gas and oil
A narrower spot in the carburetor throat that increases the speed at which a the air/gas mixture travels uses __________?
the Venturi effect
Bernoulli's Principal
Induction Theory
Four-stroke engine theory
What does the idle spring do?
Keeps tension on the governor to maintain a consistent rpms at idle
nothing, its idle after all
Increases the gas when the engine is under heavy load
Decreases the gas when the engine is under heavy load
What does the governor control?
the rpms of an engine (tries to make them constant)
the choke (controls the air going into the carburetor)
The electrical current going to the spark plug
the amount of oil in the crankcase
The governor connecting rod and spring connected to what?
the throttle plate
the choke plate
the ignition amature
the oil slinger
What are the three kinds of governors?
What is the adjustment made on the governor of small engines?
the static governor adjustment
the idle circuit screw
the ignition amateur air gap adjustment
the valve clearance adjustment
Does the spark plug fire with each rotation of the crankshaft?
yes
no
No answer text provided.
No answer text provided.
What is inside the ignition amature?
two copper coils
a computer chip
an electrical resistor
a magnet
What role does the flywheel play in the ignition system?
Provides the magnet to complete the induction theory cycle
provides the electrical current to complete the induction theory cycle
the electrical conductor to complete the induction theory cycle
it doesn't
What happens if you don't get your ignition armature air gap right?
all of these
The engine won't start
The flywheel might get chipped
The flywheel won't move
What theory does the ignition armature rely on to work?
Induction Theory
Bernoulli's Principle
the Venturi Effect
Four Stroke Theory
What are the two systems for cooling an engine?
Liquid and air cooling systems
jet propulsion and injection systems
oil and vinegar cooling systems
chemical and physical systems
What’s the difference between an oil flinger and an oil dipper?
oil flingers spin, typically on the governor gear, oil are typically found on the connecting rod
nothing
one is for small engines, the other for large
oil flingers are less effective than oil dippers
Why do you need to change your oil on a new engine after a few hours of work?
to clean out the disparities (small shards of steel) cause during the break in period
you don't have to
to prevent rust
to clean out harmful chemicals
What is the oil breather for?
to maintain a vacuum in the crankcase
to provide fresh air for the combustion chamber
to mix gas and oil
to cool the engine
What is the best oil for using in both summer and winter?
10W30 SAE
30W SAE
5W SAE
10W SAE
