Page 76 - Apprentice Manual_Neat

S2-Q40.) Cetane number of diesel fuel represents?

a.) Viscosity of the fuel
Is wrong because viscosity represents the pouring quality of oil or “thickness” of the fuel.
b.) Engine RPM acceleration quality
Is wrong because acceleration is related to many more items than Cetane number.
c.) How much ignition acceleration is used
Is wrong because ignition accelerators are used to improve Cetane but do not represent Cetane itself.
d.) *The ignition quality of the fuel.
Is correct because Cetane is the exact measure of ignition quality. Higher the Cetane number,
the shorter the ignition delay.

S2-Q41.) Which of the following is NOT considered a Basic Prime Mover?

a.) Diesel engine
Any engine capable of producing torque may be used as a prime mover. Diesel engines fit that
category.
b.) Water wheel
Any engine capable of producing torque may be used as a prime mover. Water wheels fit that
category.
c.) *Generator
Correct. A generator requires a prime mover to produce electric power. It does not have the
equipment to function as a prime mover.
d.) Gas turbine
Any engine capable of producing torque may be used as a prime mover. Any turbine gas, steam, etc.,
fit that category.

S2-Q42.) Which of the following is not a type of starting system?

a.)Air
Used to start large turbines.
b.) *Inductive
Correct. While a motor may be inductive, there are no inductive starters.
c.) Electric
Used to start most combustion engines.
d.) Hydraulic
Used to start large combustion engines.

S2-Q43.) Two 12V batteries connected in parallel will provide what voltage?

a.) 6V
12v batteries are composed of 9 cells @ 1.5V each connected in series. They cannot be divided.
b.) *12V
Correct. 12V batteries connected in parallel maintain 12V. What increases is the number of
Amp∙Hours they will produce voltage before requiring recharge.
c.) 24V
This would be connected in series. Then the number of Amp∙Hours stays the same, but the voltage
increases.
d.) Cannot be determined without a load.
Load has no bearing on the voltage available.

EGSA Apprentice Certification Program Study Guide - Page 68