ESCO Heating 208 questions with Correct Verified
Answers
1. A gas furnace is to be installed in a garage. The burners and ignition sources must be
located ______ above the floor.
A: 6 inches
B: 12 inches
C: 18 inches
D: 24 inches - ANS C: 18 inches
2. A good description of how hi-metai fan switch operates the blower motor on a gas
furnace is:
A: temperature on - time off.
B: temperature on - time on.
C: temperature on- temperature off.
D: time on - time off. - ANS C: temperature on- temperature off
3. Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds:
A: 30.5 in. W.C.
B: 60.5 in. W.C.
C: 10.5 in. W.C.
D: 13.5 in. W.C. - ANS D: 13.5 in. W.C.
4. Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____BTU's.
A: 2,000 - 2,500
,B: 1,500-2.000
C: 1,200-1,500
D: 900-1,100 - ANS A
5. LP gas has a specific gravity of:
A: .4-.8
B: 1.0-1.1
C: 1.5-2.0
D: 2.5 -3.0 - ANS C: 1.5-2.0
6. What is the purpose of a spoiler screw located on a burner?
A: Mix combustion and dilution air
B: Mix primary and secondary air.
C: Mix primary air and gas.
D: Mix dilution and excess air. - ANS C: Mix primary air and gas
7. Furnace limit switches are wired in series with the:
A: low speed fan
B: high speed fan
C: gas valve
D: heat anticipator - ANS C: gas valve
8. A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend beyond the support point.
A: l foot
B: 2 feet
, C: 3 feet
D: 4 feet - ANS C: 3 feet
9.A technician determines that a natural gas furnace has a defective heat exchanger.
The technician should:
A: inform the homeowner.
B: turn the thermostat off.
C: turn the gas to the furnace off.
D: All of the above. - ANS D: All of the above.
10. A natural gas (standing pilot) furnace usually requires ____gas pressure at the
manifold and burners.
A: 3.5 in- W.C.
B: 4.2 in. W.C.
C: 5.0 in, W.C.
D: 7.0 in. W.C. - ANS A: 3.5 in- W.C.
11. The vent system for a condensing furnace is classified as ______by the National Field
Gas Code.
A: Category I
B: Category II
C: Category III
D: Category IV - ANS D: Category IV
12. Type B vent pipe mast he kept at least _____from combustible materials.
A: one eighth inch
B: one quarter inch
Answers
1. A gas furnace is to be installed in a garage. The burners and ignition sources must be
located ______ above the floor.
A: 6 inches
B: 12 inches
C: 18 inches
D: 24 inches - ANS C: 18 inches
2. A good description of how hi-metai fan switch operates the blower motor on a gas
furnace is:
A: temperature on - time off.
B: temperature on - time on.
C: temperature on- temperature off.
D: time on - time off. - ANS C: temperature on- temperature off
3. Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds:
A: 30.5 in. W.C.
B: 60.5 in. W.C.
C: 10.5 in. W.C.
D: 13.5 in. W.C. - ANS D: 13.5 in. W.C.
4. Burning one cubic foot of Liquefied Petroleum gas completely will produce
approximately ____BTU's.
A: 2,000 - 2,500
,B: 1,500-2.000
C: 1,200-1,500
D: 900-1,100 - ANS A
5. LP gas has a specific gravity of:
A: .4-.8
B: 1.0-1.1
C: 1.5-2.0
D: 2.5 -3.0 - ANS C: 1.5-2.0
6. What is the purpose of a spoiler screw located on a burner?
A: Mix combustion and dilution air
B: Mix primary and secondary air.
C: Mix primary air and gas.
D: Mix dilution and excess air. - ANS C: Mix primary air and gas
7. Furnace limit switches are wired in series with the:
A: low speed fan
B: high speed fan
C: gas valve
D: heat anticipator - ANS C: gas valve
8. A technician is using an extension ladder to work on roof top unit. The top of the
ladder should extend beyond the support point.
A: l foot
B: 2 feet
, C: 3 feet
D: 4 feet - ANS C: 3 feet
9.A technician determines that a natural gas furnace has a defective heat exchanger.
The technician should:
A: inform the homeowner.
B: turn the thermostat off.
C: turn the gas to the furnace off.
D: All of the above. - ANS D: All of the above.
10. A natural gas (standing pilot) furnace usually requires ____gas pressure at the
manifold and burners.
A: 3.5 in- W.C.
B: 4.2 in. W.C.
C: 5.0 in, W.C.
D: 7.0 in. W.C. - ANS A: 3.5 in- W.C.
11. The vent system for a condensing furnace is classified as ______by the National Field
Gas Code.
A: Category I
B: Category II
C: Category III
D: Category IV - ANS D: Category IV
12. Type B vent pipe mast he kept at least _____from combustible materials.
A: one eighth inch
B: one quarter inch
