Hybrid-Introduction to Engines
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