Heating I Test#2 Gas Furnace

·         Question 1

0.5 out of 0.5 points

	Direct-vent heating systems
	Selected Answer:   take combustion air from outside the house Answers: take combustion air from the furnace room   take combustion air from outside the house take combustion air from the highest floor in the house take combustion air from the first floor in the house take combustion air from the cold air return duct

·         Question 2

0.5 out of 0.5 points

	An induced draft fan will purge the vent for approximately how long before ignition?
	Selected Answer:   15 to 30 seconds Answers: 1 to 5 seconds 5 to 10 seconds 10 to 15 seconds   15 to 30 seconds >30 seconds

·         Question 3

0.5 out of 0.5 points

	All are true about variable output furnaces EXCEPT
	Selected Answer:   there are low off-cycle losses Answers: on most days the furnace is oversized the house tends to overheat and then cool off there are short on-cycles   there are low off-cycle losses there are long off-cycles

·         Question 4

0.5 out of 0.5 points

	Sidewall venting locations for a high efficiency furnace should be
	Selected Answer:   >1 foot above grade Answers:   >1 foot above grade >2 feet above grade >3 feet above grade >6 feet above grade >7 feet above grade

·         Question 5

0.5 out of 0.5 points

	High-static burners for all furnaces use pressures of up to
	Selected Answer:   150 psi Answers: 100 psi   150 psi 175 psi 200 psi 250 psi

·         Question 6

0.5 out of 0.5 points

	Atomizing burners
	Selected Answer:   break up the liquid oil into a spray of fine droplets Answers:   break up the liquid oil into a spray of fine droplets form the liquid oil into a fine stream form the liquid oil into a thick stream produce very little exhaust reduce efficiency

·         Question 7

0.5 out of 0.5 points

	Flue gasses from an oil furnace should be at least how hot to avoid the production of corrosive condensation?
	Selected Answer:   350°F Answers: 475°F 200°F 250°F 300°F   350°F

·         Question 8

0.5 out of 0.5 points

	A neutralizer
	Selected Answer:   reduces the acidity in the condensation from a condensing furnace Answers:   reduces the acidity in the condensation from a condensing furnace reduces noise from a pulse furnace reduces noise caused by furnace vibrations senses combustion spillage and turns off the furnace is the last section of a condensing heat exchanger

·         Question 9

0.5 out of 0.5 points

	Tempering valves
	Selected Answer:   cool domestic hot water Answers: reduce off-cycle losses   cool domestic hot water moderate temperatures inside the heat exchanger limit fan speeds mixes oil from two different storage tanks

·         Question 10

0.5 out of 0.5 points

	The house air fan in an oil furnace will turn on when the fan control sensor sees roughly
	Selected Answer:   120°F Answers: 100°F   120°F 140°F 160°F 180°F

·         Question 11

0.5 out of 0.5 points

	Oil supply lines are usually
	Selected Answer:   copper Answers:   copper aluminum plastic lead steel

·         Question 12

0.5 out of 0.5 points

	The most common venting material for condensing furnaces is
	Selected Answer:   PVC Answers: ABS stainless steel galvanized steel aluminum   PVC

·         Question 13

0.5 out of 0.5 points

	The pulses in a pulse furnace take place approximately
	Selected Answer:   60 to 70 times per second Answers:   60 to 70 times per second 70 to 80 times per second 80 to 90 times per second 90-100 times per second >100 times per second

·         Question 14

0.5 out of 0.5 points

	Exhaust temperature from a condensing gas furnace is usually
	Selected Answer:   100°F to 150°F Answers: 50°F to 100°F   100°F to 150°F 150°F to 250°F 250°F to 300°F 300°F to 375°F

·         Question 15

0.5 out of 0.5 points

	The seasonal efficiency of a condensing gas furnace is typically
	Selected Answer:   85% to 95% Answers: 60% to 75% 75% to 85%   85% to 95% 40% to 60% 20% to 40%

·         Question 16

0.5 out of 0.5 points

	The differential pressure switch
	Selected Answer:   proves the induced draft fan is on Answers: ignites the burners extinguishes the burners proves there is no flame roll out   proves the induced draft fan is on controls the humidifier

·         Question 17

0.5 out of 0.5 points

	What is the required clearance from combustibles for a high efficiency gas furnace exhaust pipe?
	Selected Answer:   0 inches Answers: 8 inches 6 inches 4 inches 2 inches   0 inches

·         Question 18

0 out of 0.5 points

	Exhaust vent length for a mid-efficiency sidewall vented oil furnace is
	Selected Answer:   10 feet maximum Answers: 4 feet maximum 6 feet maximum 10 feet maximum 12 feet maximum   20 feet maximum

·         Question 19

0.5 out of 0.5 points

	The life expectancy of a conventional gas furnace is
	Selected Answer:   20 to 25 years Answers: 10 to 15 years 15 to 20 years   20 to 25 years 25 to 30 years over 30 years

·         Question 20

0.5 out of 0.5 points

	What is the typical clearance from combustibles required for an oil burner?
	Selected Answer:   24 inches Answers: 6 inches 12 inches   24 inches 36 inches 72 inches

·         Question 21

0.5 out of 0.5 points

	Oil furnace exhaust flues should slope up and away from the furnace at a rate of
	Selected Answer:   1/4 inch per foot Answers:   1/4 inch per foot 1/2 inch per foot 2/3 inch per foot 3/4 inch per foot 1 inch per foot

·         Question 22

0.5 out of 0.5 points

	Oil furnace exhaust flues are usually
	Selected Answer:   galvanized steel Answers: aluminum stainless steel PVC   galvanized steel ABS

·         Question 23

0 out of 0.5 points

	Common problems with high efficiency furnaces include all of the following EXCEPT
	Selected Answer:   dirty air filters Answers: obstructed condensate lines   vent damper problems cracked heat exchangers dirty air filters rust

·         Question 24

0.5 out of 0.5 points

	The condensate produced by a high-efficiency furnace is
	Selected Answer:   slightly acidic Answers:   slightly acidic usually above 250°F a rusty color considered potable water should drain through the humidifier

·         Question 25

0.5 out of 0.5 points

	The typical pressure in an oil burner pump is
	Selected Answer:   80 psi Answers: 2 psi 10 psi 30 psi   80 psi 100 psi