Deck 25: Oil Heat

Question 1

When an oil furnace is equipped with a draft regulator, the draft regulator closes when the draft in the flue pipe increases.

Answer 1

False

Question 2

For most residential applications, fuel oil lines to the furnace should be __________.

A) 3/8" O.D.
B) 1/2" O.D.
C) 1/2" I.D.
D) 5/8" I.D.

Answer 2

B

Question 3

A high-pressure atomizing oil burner delivers the oil into the combustion chamber at __________ psi.

A) 50
B) 100
C) 150
D) 200

Answer 3

B

Question 4

It is an acceptable practice to use Teflon tape on fuel oil threaded fittings.

Question 5

Every time the primary control reset is pushed, some oil is pumped into the combustion chamber.

Question 6

Over-fire draft on most residential oil furnaces should be __________ in. w.c.

A) -.01
B) -.02
C) -.03
D) -.04

Question 7

When troubleshooting an oil furnace, the technician notices that the oil burner fires and burns normally for 90 seconds, and then shuts down. What is the most likely problem?

A) defective limit switch
B) defective oil burner fan motor
C) defective room thermostat
D) defective cad cell

Question 8

If the airflow across the heat exchanger is reduced, the stack temperature will be __________.

A) higher
B) lower
C) the same

Question 9

When a cad cell senses light, the resistance measured on the cell is very low.

Question 10

When the fuel oil tank is located below the burner, a __________-pipe system is necessary.

A) 1
B) 2
C) 3
D) 4

Question 11

When the fuel oil tank is located above the burner, a __________-pipe oil system is adequate.

A) 1
B) 2
C) 3
D) 4

Question 12

A single-stage oil pump cannot operate in a two-pipe system if the vacuum necessary to operate exceeds __________ inches of mercury.

A) 10
B) 12
C) 15
D) 20

Question 13

When a cad cell does not sense light, the resistance of the cell is very low.

Question 14

High soot levels in the flue gas of oil-burning furnaces is an indication of which condition?

A) too much air
B) too little air
C) too high of a draft
D) high stack temperature

Question 15

If an oil pump had to pump oil from an oil tank located 15 feet vertically below the burner, and 20 feet horizontally from the burner, with an oil filter in the system, how much vacuum would be created?

A) 36" Hg
B) 9" Hg
C) 18" Hg
D) 20" Hg

Question 16

The high-voltage ignition transformer on an oil burner will produce __________ volts.

A) 5,000
B) 10,000
C) 20,000
D) 30,000

Question 17

The process of breaking fuel into small droplets and mixing it with air for combustion is called:

A) vaporization
B) condensation
C) atomization
D) spraying

Question 18

The flow rate that oil is fed to the burner is rated in __________.

A) gallons per hour
B) gallons per minute
C) ounces per hour
D) ounces per minute

Question 19

Which type of pipe should never be used for fuel oil lines?

A) copper
B) steel
C) brass
D) PVC
E) c and d

Question 20

Fuel oil used for residential furnaces is classified as number __________ fuel oil.

A) 1
B) 2
C) 3
D) 4

Question 21

Pre-purge is the the process of energizing the burner blower for a period of time before allowing fuel to enter the combustion chamber. This process is also referred to as __________.

A) motor-off-delay
B) valve-on-delay

Question 22

List three characteristics that are unique to each spray nozzle on an oil burner.

Question 23

Post-purge is the process of keeping the burner blower energized for a period of at the end of the heating cycle. This process is also referred to as __________.

A) motor-off-delay
B) valve-on-delay

Question 24

In order to reduce the chances of indoor air contamination, __________ appliances can be used, as they draw in outside air for combustion and exhaust the flue gasses directly back out.

Question 25

List four components of an oil burner.

Question 26

Fuel oil is made primarily of __________% hydrogen and __________% carbon.

Question 27

When troubleshooting an oil burner, the technician reads 115 volts to the primary control, but 0 volts at the high-voltage transformer primary winding. What is the most likely problem?

A) defective high voltage transformer
B) defective primary control
C) defective power switch
D) defective electrodes

Question 28

The exhaust from any heating appliance that burns a fuel contains a combination of __________, __________, __________, __________ and other trace gasses.

Question 29

List the three spray patterns used in oil burner nozzles.