Page 75 - Apprentice Manual_Neat

S2-Q36.) Complete this sentence using the choices below: “___1___engines have a higher compression
than___2___engines.”

a.) 1. Propane, 2. diesel
Propane engines require basically the same compression as gasoline engines which is much lower
than diesel engines. This is due to the volatility of gasoline and propane and there ability to ignite
with a spark.
b.) 1. Propane, 2. gasoline
Propane engines require basically the same compression as gasoline engines. This is
due to the similar volatility of gasoline and propane and their ability to ignite with a spark.
c.) *1. Diesel, 2. gasoline
Correct. Diesel engines require a much higher compression than gasoline. This is due to the
relatively low volatility of diesel fuel. A spark will not ignite diesel fuel. However, under
extreme pressure, a relatively small amount of heat will ignite the fuel.
d.) 1. Natural gas, 2. diesel
Natural gas engines require basically the same compression as gasoline engines which is much lower
than diesel engines. This is due to the volatility of gasoline and natural gas and their ability to ignite
with a spark.

S2-Q37.) Which of the following does not require a spark to ignite in a prime mover?

a.) Natural gas
Requires an ignition source.
b.) *Diesel
Correct. Diesel relies on pressure and heat to detonate.
c.) Propane
Requires an ignition source.
d.) Gasoline
Requires an ignition source.

S2-Q38.) The fuel filter in a propane system should be installed on:

a.) Inlet side of carburetor
Is partly correct because filters must always be placed before the carburetor but also cannot be placed
on the outlet side of the converter/vaporizer.
b.) * The liquid side of the fuel system
Is correct because gaseous fuel such as propane must be filtered as a liquid. Contaminants could
not be trapped on the gaseous side and would have to pass through the converter/vaporizer,
which is unacceptable.
c.) The gaseous side of fuel line
Is wrong because filers must never be placed on the gaseous side. They would not filter solid
elements.
d.) Since it is propane, no filter is needed
. Is wrong because the converter/vaporizer and carburetor are precise and require all contaminants to
be filtered out before fuel reaches it.

S2-Q39.) What is the purpose of a prime mover?

a.) To convert Watts to Horse Power.
These are both measures of energy.
b.) To convert magnetism into voltage.
This is the duty of a generator.
c.) *To convert natural energy into work.
Correct. Natural energies, such as fossil fuels, are burned in order to make another form of energy
and/or to do work.
d.) To convert work into electrical energy
Prime movers may be used in venues other than power generation.

Page 67 - EGSA Apprentice Certification Program Study Guide