Page 94 - Apprentice Manual_Neat

S4-Q108.) With a transfer or day tank above the main fuel tank, what are two factors that must be considered in
constructing the fuel storage system.

a.) Main tank size and pump lift
Is wrong because while pump lift is a factor, main tank size isn’t an issue at all.
b.) *Pump size and piping size
Is correct because pump size determines pressure, flow and lift capabilities and pipe size
determines restriction to flow and lift. They are both factors then.
c.) Fitting restriction and day tank size
Is wrong because while fittings have to be considered with their inherent restrictive qualities, day
tank size is not an issue and therefore is not a factor.
d.) Pump lift and engine weight
Is wrong because while pump lift capability determines how high fuel can be pumped to a day tank,
engine weight is not an issue and therefore not a factor.

S4-Q109.) What is/are the advantage(s) of a “duplex” pumping arrangement in a day tank system?

a.) Doubles the pressure and more energy efficient
Is wrong because while there are two pumps, displacement or flow is increased. Pressure is a
regulated factor, does not “double” and makes the answer wrong.
b.) Provides redundant back up system and is more energy efficient
Is correct because if one pump fails, the other provides fuel and two small pumps are more energy
efficient than one large pump.
c.) Provides additional fuel if demand exceeds capacity on one pump
Is correct because the duplex system is designed to provide more fuel than the maximum prime
mover requirement for a particular application.
d.) *b and c of the above
Is the most correct because it includes both b and c answers.

S4-Q110.) What component regulates coolant temperature in a large capacity circulation pre-heater?

a.) *An inline thermostat
Is the most correct because an inline thermostat is the easiest to install and most correct in that
it measures temperature of recirculating coolant where no other variable (i.e.Engine block)
comes into play.
b.) The engine thermostat
Is completely wrong because an engine thermostat only regulates operating engine temperature as
opposed to a preheater that operates while engine is not running.
c.) A flow detection device
Is wrong because while flow detection devices are used in a preheater system, they do not regulate
coolant temperature.
d.) Oil pressure switch.
Is wrong because the oil pressure switch is only an option and is installed on engines for safety
reasons.

S4-Q111.) Heavy Duty water jacket or recirculating coolant pre-heaters can be wired for _____________
applied voltage.

a.) 110 VAC
Is wrong because 110 VAC would require too much current for heating resulting in higher energy
costs.
b.) 220 VAC only
Is wrong because in heavy duty preheating systems, 220 VAC and 480 VAC can be utilized depending
on available inputs and owner preference.
c.) *220 and 440 VAC
Is correct because preheater manufacturers provide the option on all heavy duty applications.
d.) 480 VAC only
Is wrong because of the above answer c.

EGSA Apprentice Certification Program Study Guide - Page 86