Hybrid-Introduction to Engines

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step of operation for the rotary engine

1. Intake 2. Compression 3. Combustion 4. Exhaust

Operation steps for a two-stroke engine

1. the piston moves up the cylinder 2. the pressure in the crankcase decreases 3. the air-fuel charge pushes the reeds open 4. the piston moves down the cylinder 5. the pressure in the crankcase increases 6. the valve closes

Technician A states that hoses have different types of reinforcement to withstand pressure differences. Technician B states that hoses connect components such as the radiator, water pump, and heater. Which Technician is correct?

Both Technician A and B

Technician A states that the reed induction engine consists of multiple reed petals that allow air into the crankcase. Technician B states that the reed induction engine is the most popular type of two-stroke engines. Which is correct?

Both technician A and B

During which stage in the rotary engine cycle do the spark plugs fire the air and fuel?

Combustions

Which stage of the rotary engine cycle begins when the rear seal of the rotor is no longer exposed to the intake port?

Compression

During which stage in the rotary engine cycle do gases exit the housing?

Exhaust

Rubber hoses remain soft and do not harden.

False

Teflon-lined hoses are used to contain coolant

False

The rotary valve turns the crankshaft and covers the exhaust port

False

Two-stroke engine has an independent lubrication system

False

When there is no movement between parts, hoses are used.

False

In a __________ system a predetermined amount of oil is injected into the crankcase to mix with the fuel.

Oil-injected system

has eccentric lobes

Output shaft

In a ___________ system the oil and fuel are mixed together before being placed in the crankcase. This system is a 100% loss system.

Premixed system

changes the working chamber size in the housing

Rotor

has an internal bearing in the center

Rotor

When used in hoses, nylon prevents the hose from collapsing due to pressure differences.

True

What type of engine does the spark plug fire every revolution of the crankshaft?

Two-stroke

creates vacuum leaks, causing poor engine performance

crankshaft failure

The two-stroke engine is used in mopeds because _____________ standards do not apply

emission

A two-stroke engine does have a valve train

false

The piston port is more efficient at filling the cylinder

false

The rotary valve is the simplest design

false

Spring lock fittings use a __________.

garter spring and cage

Flared fittings are __________.

made with a special tool

The two-stroke engine is used on landscaping equipment because the engine will operate regardless of its _____________

orientation

Provides the bearings with lubrication

output shaft

AN fittings determine the __________.

outside diameter of the fitting

can cause engine damage or scoring on the cylinder wall

piston/bearing failure

The two-stroke engine's ___________ is higher than a four-stroke

power-to-weight ratio

causes poor engine performance

reed valve failure

Can cause spark plug failure

rich/lean fuel

Step three of a two-stroke engine

the air-fuel charge pushes the reeds open

Step four of a two-stroke engine

the piston moves down the cylinder

Step one of a two-stroke engine

the piston moves up the cylinder

Step two of a two-stroke engine

the pressure in the crankcase decrease

Step five of a two-stroke engine

the pressure in the crankcase increases

Step six of a two-stroke engine

the valve close

High pressure in the crankcase forces fuel mixture into the intake port

two-stroke engine

Fastener fittings are __________.

used in air conditioning components

The reed valve uses flexible metal petals for controlling crankshaft pressure

True

Technician A says the rotary engine uses cylinders and rotaries as pressure combustors in the engine. Technician B says the piston engine uses crankshafts and output shafts in the engine. Which technician is correct?

Neither Technician A or B

Technician A states that in the combustion cycle, the oil is burned off while the fuel is used to lubricate the system. Technician B states that in the oil-injected system, oil is sprayed directly into the combustion chamber to cool the piston. Which technician is correct?

Neither Technician A or B

Technician A says that apex seal failure has occurred if compression is leaking between two chambers. Technician B says that loss of coolant can occur at the internal gear if the gear is misaligned. Which technician is correct?

Technician A

Technician A states that in a rotary inlet valve two-stroke engine, the rotary valve is attached to the crankshaft. Technician B states that a loop scavenged two-stroke engine allow air and fuel mixture to flow directly out of the exhaust port. Which technician is correct?

Technician A

Hoses are used when movement occurs between two parts.

True

Teflon linings protect hoses from deterioration.

True

The four-stroke engine has a valve train

True

The intake port is located on the side of the crankcase on a rotary valve engine

True

The piston port has a tendency to backfire at low speeds

True


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