Trans Tech

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B C A

What are three basic functions that governors serve

- Maintain a certain speed - Prevent over speeding - Limit speed

The usual normal air-fuel mixture is a ratio of ___ to ___

15 to 1

For average applications such as normal yard lawn mowing, the air cleaner should be cleaned every _____ hours, or _____ time(s) per season

25, once

Explain the venturi principle

A restriction in a passage will cause incoming air to increase its velocity

As the air filter fills with dirt the air fuel mixture will...

A) Become leaner

An engine air cleaner should be examined...

A) Every time the engine is serviced or repaired

33) Identify parts

A) Spring tension B) Governor springs C) Shaft D) Valve

Identify each basic type of carburetor

A. Side/Neutral draft B. Updraft C. Downdraft

Explain what is happening in the figure below, Q6...

Air entering the carburetor mixes with fuel in proper proportion and mixture flows into the combustion chamber

The primer on a float type carburetor pumps...

Air pressure into the float bowl forcing fuel up the nozzle

List three types of governors

Air vane and Vacuum

As soon as the intake valve opens or the intake port is uncovered in a gas engine ____ ____ forces air through the manifold and carburetor to fill the vacuum

Atmospheric pressure

Diaphragm carburetors are operated by the...

Atmospheric pressure

Gasoline must be _____ by the carburetor

Atomized

Since blade tip speed is a function of blade length and engine rpm ____ blades require ____ engine speeds

B, Longer, slower

Explain how the throttle valve controls engine speed and power

By regulating the amount of fuel mixture entering the engine

Most dry type air filter elements

C) Can be cleaned by tapping to dislodge light dirt

Explain the main purpose for the throttle valve

Controls engine speed and power

When the air filter becomes dirty the engine will...

D) All of the above

The ____ carburetor can provide larger volumes of fuel for high speed

Downdraft

_____ type air cleaners pass the airstream through treated paper, felt and fiber

Dry

When an engine is designed for use in greater than normal dusty conditions a _____ element air filter is installed

Duel

The carburetor float is a round disk mounted on a shaft located at the intake end of the carburetor

Float

The air vane governor is operated by the stream of air created by the _____ cooling fins

Flywheel

_____ is when the engine speeds up and slows down repeatedly

Hunting

In a diaphragm carburetor opperation, during intermediate speeds, the fuel flows from the...

Idle discharge ports only

What is the purpose of the of the carburetor float

It maintains a constant amount of fuel and prevents overflow

A _____ _____ type of air cleaner element can be used again by washing it in soapy water

Oil wetted

Three types of air cleaners

Oil wetted, Dry types, Dual elements

The economizer circuit is designed to retard fuel flow to the engine at

Part throttle

If an engine is designed to run at a constant speed, the speed is adjusted with the governor...

Spring

On an air one governor, controlling speed in accomplished by balancing air pressure with...

Spring tension

The ability of a governor to maintain a preset speed without changing is called...

Stability

As fuel is used from the float bowl, the float lowers and unseats a _____ valve which lets fuel enter the bowl

Throttle

Carburetors primary function

To mix proper amounts of fuel and air to operate the engine

Air velocity must be the highest in the ____ carburetor

Updraft

A _____ type governor is used on farm and industrial engines

Vacuum

An absolute _____ is any space free of air or atmospheric pressure

Vacuum

A ____ is used to equalize air pressure above the fuel in the float bowl and the air pressure entering the carburetor

Vent

The acceleration _____ stores fuel for use during rapid acceleration

Well

When closed the choke provides a _____ air fuel mixture

richer