YAMAHA CHP 6: MOTOR DESIGNS EXAM | QUESTIONS AND
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS (100%
CORRECT) | LATEST EXAM UPDATE
Stroke - CORRECT ANSWER - When a Piston travels from the top of the
cylinder to the bottom or from the bottom to the top
2 strokes - CORRECT ANSWER - One full revolution of the crankshaft will
create how many strokes in a2 stroke motor
One complete revolution - CORRECT ANSWER - A two stroke motor requires
how many revolutions of crankshaft to produce events required to complete a
combustion cycle
Combustion - CORRECT ANSWER - When Spark plug ignites the compressed
air fuel mixture
Exhaust - CORRECT ANSWER - Burning air fuel forces the piston down and the
pressure in the crankcase increases
Exhaust port is exposed and combustion gas is expelled from the cylinder due to
pressure difference between gas and atmosphere - CORRECT ANSWER - What
happens as the piston is moving downward in 2 stroke engines
Transfer ports - CORRECT ANSWER - What is exposed the feather down a
piston moves downward in 2 strokes
,Pushed into the cylinder and help to force the remaining exhaust out - CORRECT
ANSWER - Where does the air-fuel go after it has been compressed in the
crankcase
Four stroke - CORRECT ANSWER - Requires two complete revolutions of
crankshaft to produce 4 strikes required to complete combustion cycle
1. Exhaust valve is opened
2. Piston begins to move upward
3. Exhaust gas is expelled
4. Exhaust valve is closed - CORRECT ANSWER - Exhaust process in 4 stroke
motors
1. Intake valve is opened
2. Piston moves downward
3. Negative pressure is produced in cylinder
4. Air fuel mixture is taken in - CORRECT ANSWER - Intake process of 4 stroke
motors
1. Sparks occur at correct time
2. Combustion of air fuel mixture
3. Production of high temperature, high pressure gas
4. Piston is forced to move downward - CORRECT ANSWER - Combustion
process of 4 strokes
1. Position moves upward
, 2. Intake valve is closed
3. Air fuel mixture is compressed - CORRECT ANSWER - Compression process
of 4 strokes
Valve train - CORRECT ANSWER - Integral part of 4 stroke engine operation
Overhead valve (OHV)
Single overhead camshaft (SOHC)
Dual overhead camshaft (DOHC) - CORRECT ANSWER - 3 systems of valve
actuation used in 4 stroke motors
Overhead valve - CORRECT ANSWER - Valve actuation that has valves above
piston
Smaller combustion chamber which increases efficiency - CORRECT ANSWER
- Overhead valve actuation allows what
Small outboards that operate at low rpm's - CORRECT ANSWER - Overhead
valve actuation is designed for what type of 4 stroke
Push rod engine - CORRECT ANSWER - Another name for the design of
overhead valve actuation is
Camshaft was moved into the cylinder head - CORRECT ANSWER - In a single
overhead camshaft, what was done to achieve better performance
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS (100%
CORRECT) | LATEST EXAM UPDATE
Stroke - CORRECT ANSWER - When a Piston travels from the top of the
cylinder to the bottom or from the bottom to the top
2 strokes - CORRECT ANSWER - One full revolution of the crankshaft will
create how many strokes in a2 stroke motor
One complete revolution - CORRECT ANSWER - A two stroke motor requires
how many revolutions of crankshaft to produce events required to complete a
combustion cycle
Combustion - CORRECT ANSWER - When Spark plug ignites the compressed
air fuel mixture
Exhaust - CORRECT ANSWER - Burning air fuel forces the piston down and the
pressure in the crankcase increases
Exhaust port is exposed and combustion gas is expelled from the cylinder due to
pressure difference between gas and atmosphere - CORRECT ANSWER - What
happens as the piston is moving downward in 2 stroke engines
Transfer ports - CORRECT ANSWER - What is exposed the feather down a
piston moves downward in 2 strokes
,Pushed into the cylinder and help to force the remaining exhaust out - CORRECT
ANSWER - Where does the air-fuel go after it has been compressed in the
crankcase
Four stroke - CORRECT ANSWER - Requires two complete revolutions of
crankshaft to produce 4 strikes required to complete combustion cycle
1. Exhaust valve is opened
2. Piston begins to move upward
3. Exhaust gas is expelled
4. Exhaust valve is closed - CORRECT ANSWER - Exhaust process in 4 stroke
motors
1. Intake valve is opened
2. Piston moves downward
3. Negative pressure is produced in cylinder
4. Air fuel mixture is taken in - CORRECT ANSWER - Intake process of 4 stroke
motors
1. Sparks occur at correct time
2. Combustion of air fuel mixture
3. Production of high temperature, high pressure gas
4. Piston is forced to move downward - CORRECT ANSWER - Combustion
process of 4 strokes
1. Position moves upward
, 2. Intake valve is closed
3. Air fuel mixture is compressed - CORRECT ANSWER - Compression process
of 4 strokes
Valve train - CORRECT ANSWER - Integral part of 4 stroke engine operation
Overhead valve (OHV)
Single overhead camshaft (SOHC)
Dual overhead camshaft (DOHC) - CORRECT ANSWER - 3 systems of valve
actuation used in 4 stroke motors
Overhead valve - CORRECT ANSWER - Valve actuation that has valves above
piston
Smaller combustion chamber which increases efficiency - CORRECT ANSWER
- Overhead valve actuation allows what
Small outboards that operate at low rpm's - CORRECT ANSWER - Overhead
valve actuation is designed for what type of 4 stroke
Push rod engine - CORRECT ANSWER - Another name for the design of
overhead valve actuation is
Camshaft was moved into the cylinder head - CORRECT ANSWER - In a single
overhead camshaft, what was done to achieve better performance
