Esco Heating 208 Exam Questions and
Answers
Question 1
A gas furnace has an induced draft fan. What switch must operate property before
ignition sequence?
A: fan limit.
B: dilation air.
C: rollout.
D: differential air pressure.
Correct Answer
D
Question 2
A redundant gas valve will have some type of vent limiting orifice. What is Its
purpose?
A: Decrease regulation pressure safety.
B: Increase regulation pressure safety.
C: Regulation and proper safe operation.
D: Proper operation in high altitude locations.
Correct Answer
C
Question 3
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
Correct Answer
C: 18 inches
Page 1 of 32
,Question 4
A gas furnace installed at altitudes above ______feet needs to have adjustments to
operate properly.
A:500
B: 1000
C: 1,500
D: 2,000
Correct Answer
D
Question 5
A technician serv icing an LP gas furnace notices a tag stating it was converted from
natural gas. He finds large amounts of soot in the heat exchanger. What could be the
cause of this soot?
A: Low gas pressure.
B: Low air flow (CFM).
C: Incorrect return air velocity.
D: Orifice, (spud) too large.
Correct Answer
A
Question 6
The Maximum allowable temperature rise through a furnace heat exchanger is;
A: 70°F.
B: 80°F.
C: 90°F.
D: 100°F.
Correct Answer
A
Page 2 of 32
,Question 7
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
Correct Answer
A
Question 8
The proper chemical name for natural gas is:
A: Methane
B: Propane
C: Butane
D: Octane
Correct Answer
A
Question 9
A gas valve with 100% shut off means:
A: gas to main burner is shut-off
B: gas to a pilot burner is shut off
C: gas to the manifold is shut off
D: gas to the regulator is shut off
Correct Answer
B
Page 3 of 32
, Question 10
Induced draft furnaces have a vent safety switch that should open at
A: 80°F.
B: l00°F.
C: 120°F.
D: 140°F.
Correct Answer
D
Question 11
Duct wrap is used to insulate round metal ducts. What is the approximate R-value for
one inch of this insulation?
A: R-1.5
B: R-2.8
C: R-4.0
D : R-6.0
Correct Answer
C: R-4.0
Question 12
On a dedicated vent system, a fire stop support plate is located:
A: after an adjustable elbow.
B: between flashing and the vent cap.
C: above Type B metal vent.
D: where it passes through a ceiling.
Correct Answer
D
Page 4 of 32
Answers
Question 1
A gas furnace has an induced draft fan. What switch must operate property before
ignition sequence?
A: fan limit.
B: dilation air.
C: rollout.
D: differential air pressure.
Correct Answer
D
Question 2
A redundant gas valve will have some type of vent limiting orifice. What is Its
purpose?
A: Decrease regulation pressure safety.
B: Increase regulation pressure safety.
C: Regulation and proper safe operation.
D: Proper operation in high altitude locations.
Correct Answer
C
Question 3
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
Correct Answer
C: 18 inches
Page 1 of 32
,Question 4
A gas furnace installed at altitudes above ______feet needs to have adjustments to
operate properly.
A:500
B: 1000
C: 1,500
D: 2,000
Correct Answer
D
Question 5
A technician serv icing an LP gas furnace notices a tag stating it was converted from
natural gas. He finds large amounts of soot in the heat exchanger. What could be the
cause of this soot?
A: Low gas pressure.
B: Low air flow (CFM).
C: Incorrect return air velocity.
D: Orifice, (spud) too large.
Correct Answer
A
Question 6
The Maximum allowable temperature rise through a furnace heat exchanger is;
A: 70°F.
B: 80°F.
C: 90°F.
D: 100°F.
Correct Answer
A
Page 2 of 32
,Question 7
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
Correct Answer
A
Question 8
The proper chemical name for natural gas is:
A: Methane
B: Propane
C: Butane
D: Octane
Correct Answer
A
Question 9
A gas valve with 100% shut off means:
A: gas to main burner is shut-off
B: gas to a pilot burner is shut off
C: gas to the manifold is shut off
D: gas to the regulator is shut off
Correct Answer
B
Page 3 of 32
, Question 10
Induced draft furnaces have a vent safety switch that should open at
A: 80°F.
B: l00°F.
C: 120°F.
D: 140°F.
Correct Answer
D
Question 11
Duct wrap is used to insulate round metal ducts. What is the approximate R-value for
one inch of this insulation?
A: R-1.5
B: R-2.8
C: R-4.0
D : R-6.0
Correct Answer
C: R-4.0
Question 12
On a dedicated vent system, a fire stop support plate is located:
A: after an adjustable elbow.
B: between flashing and the vent cap.
C: above Type B metal vent.
D: where it passes through a ceiling.
Correct Answer
D
Page 4 of 32
