WorksheetsSmall Engines Summative
Total questions: 98
Worksheet time: 3hrs 15mins
What is the primary function of the camshaft and the valve train in an internal combustion engine?
To lubricate the engine components
To control the vehicle's speed
To manage the opening and closing of the intake and exhaust valves
To regulate the engine's temperature
What component of the valve train is responsible for opening and closing the valves with precise timing?
Push rod
Valve spring
Rocker arm
Camshaft
Which type of valves are most modern engines using?
Sleeve valves
Poppet valves
Slide valves
Rotary valves
What is the role of valve springs in the valve train?
To ensure proper seating of the valves
To transfer motion from the camshaft to the valves
To synchronize the camshaft and crankshaft
To regulate the flow of exhaust gases
What is the purpose of the timing mechanism in the valve train?
To ensure that the valves open and close at the correct moments
To increase the engine's horsepower
To cool down the engine
To reduce the engine's noise
Which engine configuration is known for its high torque output, particularly at lower RPMs?
Flathead engine
Single overhead camshaft engine
Dual overhead camshaft engine
Overhead valve engine
What is a significant advantage of dual overhead camshaft engines?
They are less expensive to produce
They allow for more precise control over valve timing and lift
They have a simpler valve train system
They limit the engine's maximum rpm capability
Which engine design was widely used in early Automotive applications but has been largely replaced by more efficient designs?
Overhead valve engine
Single overhead camshaft engine
Flathead engine
Dual overhead camshaft engine
What was one of the limitations of Flathead engines?
They required frequent maintenance
They restricted airflow into and out of the combustion chamber
They were too complex to manufacture
They were too expensive
Which motorcycle manufacturer is known for employing Flathead V-Twin engines in their early models?
(I make fun of this brand of motorcycles a lot)
(Mainly because they are only loud and not fast)
BSA
Harley-Davidson
Indian
Triumph
What completes a combustion and exhaust cycle in only two strokes of the piston?
Electric motor
Two-stroke engine
Four-stroke engine
Diesel engine
Who received a patent for the two-stroke gas engine in 1879?
Karl Benz
Rudolf Diesel
Nikola Tesla
Henry Ford
Which engine type is known for having a simpler mechanic and consolidates the process into two strokes?
Hybrid engine
Two-stroke engine
Four-stroke engine
Electric engine
What is a significant advantage of two-stroke engines over four-stroke engines?
More fuel-efficient
Fantastic power-to-weight ratio
Less pollution
Longer-lasting
Why do two-stroke engines have fewer overheating concerns?
They operate at lower temperatures
They use water cooling
Each new charge cools off the chamber
They have a more complex cooling system
What is a disadvantage of two-stroke engines compared to four-stroke engines?
Less power
More expensive to manufacture
More harmful emissions
Heavier
Why are two-stroke engines not commonly used in cars?
They are too powerful
They are too noisy
They are too expensive
Lack of a dedicated lubrication system
What does the oil and gas mixture do in a two-stroke engine?
Only lubricates the system
Only powers the engine
Lubricates and powers the engine
Cools the engine
Why do two-stroke engines produce a lot of pollution?
They operate at higher temperatures
They use low-quality fuel
New charges of air and fuel sneak out through the exhaust port
They have a complex exhaust system
In what applications are two-stroke engines primarily used?
Long-distance transportation
Applications needing great power-to-weight ratio
Heavy machinery
Passenger cars
What has replaced the carburetor in most modern engines?
Throttle valve
Air filter
Fuel injector
Fuel pump
When we hit the gas, what are we actually doing?
Opening the throttle valve to allow more air
Injecting gas directly into the chamber
Adding more fuel
Increasing the engine's temperature
What is the ideal fuel to air ratio mentioned for a complete burn?
One part fuel to 10 parts air
One part fuel to 13 parts air
One part fuel to 12.5 parts air
One part fuel to 12 parts air
What is the main advantage of electronic fuel injection over carburetors?
It's purely mechanical
It allows for real-time tailored fueling
It's simpler to understand
It requires manual adjustments
Why do motorcycles not use direct injection?
Because it's too expensive
Because it's less efficient
Because it's too complex
Because they rev too fast
What year did Congress amend the Clean Air Act, encouraging the use of ethanol in gasoline?
2000
1995
1990
1985
What is a major problem with ethanol gas in carburetors?
It separates into a gummy goo
It vaporizes too quickly
It increases fuel efficiency
It's too expensive
What is the main reason fuel injectors are considered the future over carburetors?
They are cheaper to produce
They are easier to clean
They allow for future fuel compatibility
They are purely mechanical
This part connects the Piston to the Crankshaft
Piston Rod
Jesus Clip
Connecting Rod
Timing Chain
Which valve train configuaration does our school engine have?
OverHead Valve
OverHead Cam
L Head
Dual Overhead Cam
Turbos require forced lubrication. Can our school engine run a turbo in its current configuration?
Yes
No
If your engine has abnormally high compression is the valve lash.......
Too Tight
Too Loose
Which jet is the one in charge of supplying fuel during low rpm operation?
Main Jet
Idle Jet
Do DOHC engines have rocker arms?
Yes
No
Sometimes
How can you check if your engine has a fuel issue?
Check the sparkplug and see if it is wet.
Pour a little gas into the intake.
Pull the sparkplug out and pull the engine over.
Remove the carburetor and try to start the engine without it.
Are push lawnmower engines....
Vertical Shaft
Horizontal Shaft
What valve configuration does my dirtbike have?
OHV
DOHC
Reed Valves
OHC
What tool is needed to check compression?
Spark plug socket
Ratchet
Compression tester
Torque Wrench
Who invented the turbocharger?
Nikola Tesla
Alfred Buchi
Henry Ford
Karl Benz
What is the main purpose of a turbocharger?
To clean exhaust gases
To cool down the engine
To increase engine power
To increase fuel efficiency
What does a turbocharger use to power the compressor?
Exhaust gases
External air
Electricity
Hydraulic fluid
What is turbo normalizing?
Increasing the turbo speed
Cooling the turbocharged air
Restoring air pressure to sea level pressure
Reducing turbo lag
What is the function of a blow off valve in a turbocharger?
To increase air pressure
To cool down the air
To relieve pressure when lifting off the throttle
To filter the air
Why do turbochargers create a lot of heat?
A. Due to the high speed of the turbine
D. They have an intercooler
B. Because of the friction when air molecules are compressed
C. From the combustion process in the engine
What is the purpose of an intercooler in a turbocharged engine?
To increase air pressure
To reduce the temperature of the turbocharged air
To filter the air
To lubricate the turbo
What problem does using two smaller turbos instead of one large turbo solve?
Cost
Turbo lag
Heat generation
Air pressure
What was the first commercially available twin turbo car?
Maserati Biturbo
Nissan 300ZX
Mitsubishi 3000GT
Toyota Supra
How do sequential turbochargers alleviate turbo lag?
By increasing the exhaust flow
By cooling the air more efficiently
By using a smaller turbo to spool up quickly
By using a larger turbo only
What is the third stroke of an engines
Exhaust
Intake
Compression
Power
What is the number one shop safety rule?
Report all accidents to the instructor
Always wear safety glasses
No horseplaying
Know where the fire extinguishers are located
What is the first stroke of an engine?
Compression
Intake
Power
Exhaust
What is the last stroke of an engine?
Exhaust
Power
Compression
Intake
What are the three main engines systems
Ignition, Compression, Fuel
Intake, Compression, Exhaust
Intake, Fuel, Compression
Spark, Fuel, Compression
What are the two valves called?
Exhaust, Intake
Intake, Outtake
Ignition, Exhaust
Up, Down
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 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
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 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 is the best oil for using in both summer and winter?
10W30 SAE
30W SAE
5W SAE
10W SAE
This system changes reciprocating motion into rotary motion.
Lubrication
Mechanical
Ignition
Starting
Where the piston moves up and down.
Cylinder
Crankcase
Combustion Chamber
Head
The piston is attached to the crankshaft by the:
rings
wrist pin
camshaft
connecting rod
There are __________________ rings on a small engine piston.
one
two
three
four
