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Oil Heat Unit 32 Questions and Answers
Already Passed
If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____. ✔✔a. The nozzle may be too small.
b. The stack switch may be defective. c. The primary control unit may be defective. d. Both b and c are correct. Answer : D
A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____. ✔✔a. has an outer wrench that holds the burner in place, while the inner wrench holds the nozzle b. minimizes the chance of cracking the porcelain c. can only be used on semi-hollow cones d. both a and b Answer : D
The number engraved on the nozzle indicates ____. ✔✔a. how many gallons of air per hour the nozzle will deliver regardless of input pressure
b. how many foot pounds of pressure must be used to properly tighten the nozzle c. how many gallons of oil per hour the nozzle will deliver at a given input pressure d. the stock number of the part Answer : C
Improper combustion can lead to ____. ✔✔a. excessive carbon monoxide production
b. smoke condition around furnace c. wasted oil d. all of the above Answer : D
The grade of fuel usually used in residential
and light commercial units is ____. ✔✔a. No. 1
b. No. 2 c. No. 4 d. No. 6
which of the following to prove ignition? ✔✔a. heat in the flue
b. heat in the combustion chamber c. light in the combustion chamber d. heat in the blast tube Answer : C
The stack switch or stack relay ____. ✔✔a. starts the fan motor when the thermostat calls for heat b. shuts down the burner if it does not sense heat in the flue products c. cuts off the ignition after the flame has been established d. all of the above Answer : B
A condensing oil furnace operates at a higher
efficiency because part of the heat output is ____. ✔✔a. sensible heat
b. latent heat c. superheat d. sub-cooling
Answer : B
To make combustion efficiency tests, a hole
must be made ____. ✔✔a. in the flue pipe after the draft control
b. in the flue pipe before the draft control c. over the fire at the observation door d. under the draft hood Answer : B
In a single-stage fuel oil pump, the oil is fed to the burner by capillary action. ✔✔Answer : False
Nozzles can be cleaned to remove any carbonization by using a very fine wire brush. ✔✔Answer : False
For complete combustion and higher efficiency, the oil spray and the air flow off the blast tube both turn counter-clockwise. ✔✔Answer : False
When any product containing hydrogen
and/or carbon reacts with oxygen to release heat energy, the process is called? ✔✔Answer : Combustion_
The portion of a nozzle assembly that produces rotation of the oil spray is called the
? ✔✔Answer :Swirl Chamber.
The heat content of one gallon of No. 2 fuel oil
? ✔✔Answer :140,000 btu/gal.
---------- is the amount of carbon left in a sample of oil after it is vaporized,
changed from a liquid to a vapor, by boiling it. ✔✔Answer :Carbon Residue
In a two _--- configuration one pipe is the
supply and the other acts as the return. ✔✔Answer :Pipe
. Oil lines can be constructed of _____, ______,______ pipe connected with malleable fittings. ✔✔Answer :Copper,Wrought Iron or Steel
____ and ____ pipes should be pitched toward the tank opening to prevent the formation of oil traps. ✔✔Answer : Fill ,Vent
The __________ is an oil piping component that allows a one-pipe system to function as a two-pipe system. ✔✔Answer :Oil DE-aerator
__________ is a colorless and odorless gas. ✔✔Answer :Carbon Monoxide
Modern oil burners are referred as high pressure burners, as the oil is delivered through the burner at a pressure of about ___ psi. ✔✔Answer :
There are two main types of oil pumps used
on gun-type burners, ______ and _______ ✔✔Answer :Single Stage,Two Stage_
. What would happen if the narrow spray
angle nozzle were used in a round combustion chamber? ✔✔Answer :Not efficient, not enough heat
. An oil burner equipped with the CAD cell relay will ignite, run for about ninety seconds, and cut off. What is the first thing the service technician should do? ✔✔Answer :Make sure the cad cell is clean, check for alignment, adjust for correct fire
What meters flow of fuel oil into the chamber ✔✔a. CAD cell
b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : B
What generates approximately 10,000 volts needed for spark ✔✔a. CAD cell
b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : D
What devices that will shut burner down in case the burner doesn't fire ✔✔a. CAD cell
b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : F
What creates turbulence in the air-oil mixture to increase efficiency ✔✔a. CAD cell
b. nozzle c. electrodes
f. stack switch Answer : C
