Small Engines

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

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

Tags

NGSS.HS-PS2-1

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

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

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