Millwright-Engines Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is the purpose of a coolant To reduce warm-up time and prevent
bypass tube when referring to cylinder
thermostats? head from over heating
What must be done to the air/fuel The carburetor vaporizes the liquid
mixture on a gasoline system gasoline and
before mixes it with the incoming air to provide
it enters the cylinders? the correct
air-fuel mixture.
Running __________ = not too lean (more air)
enough power,
increase in temperature (like a
turbo
boost). The air fuel ratio will
change,
eg) from 14:1 to 16:1.
After performing any work on a bleed all the air out
diesel fuel system you must,
___________
before running. (filters, injectors,
injector pump, etc.)
, The purpose of __________ is to injectors
atomize
the fuel and spray it into the
cylinder
at the correct time.
What is the main difference Because of the high compression ratio
between (16:1 - 20:1),
gas and diesel engines? this gives a high air temperature which can
ignite
the fuel without a spark.
How is a diesel engine timed?
The injection pump delivers fuel under high
pressure at the correct moment to the
injectors.
Running ___________ =high too rich (more fuel)
emissions (O2
sensors), high exhaust
temperatures.
The air:fuel ratio will change, eg)
from 14:1 to 12:1
What is the purpose of a vaporizer vaporize the liquid propane to a gas by a
on an LPG system? pressure
V drop and by heating the liquid with warm
engine
coolant.
What are some causes of Low octane fuels, Timing set to early, Lean
detonation? fuel
mixtures, Improper cooling.
Answers with Verified Solutions | Latest
Updated 2026
What is the purpose of a coolant To reduce warm-up time and prevent
bypass tube when referring to cylinder
thermostats? head from over heating
What must be done to the air/fuel The carburetor vaporizes the liquid
mixture on a gasoline system gasoline and
before mixes it with the incoming air to provide
it enters the cylinders? the correct
air-fuel mixture.
Running __________ = not too lean (more air)
enough power,
increase in temperature (like a
turbo
boost). The air fuel ratio will
change,
eg) from 14:1 to 16:1.
After performing any work on a bleed all the air out
diesel fuel system you must,
___________
before running. (filters, injectors,
injector pump, etc.)
, The purpose of __________ is to injectors
atomize
the fuel and spray it into the
cylinder
at the correct time.
What is the main difference Because of the high compression ratio
between (16:1 - 20:1),
gas and diesel engines? this gives a high air temperature which can
ignite
the fuel without a spark.
How is a diesel engine timed?
The injection pump delivers fuel under high
pressure at the correct moment to the
injectors.
Running ___________ =high too rich (more fuel)
emissions (O2
sensors), high exhaust
temperatures.
The air:fuel ratio will change, eg)
from 14:1 to 12:1
What is the purpose of a vaporizer vaporize the liquid propane to a gas by a
on an LPG system? pressure
V drop and by heating the liquid with warm
engine
coolant.
What are some causes of Low octane fuels, Timing set to early, Lean
detonation? fuel
mixtures, Improper cooling.
