Deck 10: Forced Air Heating and Alternative Heating Systems

Question 1

Condensing furnaces rated at an efficiency of 90 percent or higher typically have a flue gas temperature of:

A)350 ° F
B)550 ° F
C)250 ° F
D)105° F

Answer 1

D

Question 2

Lowboy furnace models are designed for outdoor installations in buildings in which interior space is not available.

Answer 2

False

Question 3

Oil-fired furnace controls sense what instead of heat?

A)light
B)humidity
C)time of day
D)dirty flame

Answer 3

A

Question 4

Which of the following furnace configurations were popular in areas with basements and use the unit in that location?

A)lowboy
B)upflow/highboy
C)downflow/counterflow
D)horizontal

Question 5

A dirty flame in an oil-fired furnace produces?

A)soot
B)reduced humidity
C)poor air quality in heated space
D)none of the above

Question 6

Which of the following is NOT a step in the startup and shutdown procedure of a modern gas furnace?

A)thermostat sends signal to control board
B)furnace runs until thermostat is satisfied
C)vent fan pressurizes vent system
D)all of the above

Question 7

Presently, federal guidelines require manufacturers to produce fossil-fuel burning units that have an efficiency rating of at least 95 percent.

Question 8

Electric furnaces are far less efficient than fossil-fuel burning furnaces.

Question 9

Which of the fossil-fuel burning furnace units is the most efficient, based on its AFUE?

A)85
B)90
C)80
D)75

Question 10

One of the most effective steps to improve the efficiency of a building is to

A)replace insulation throughout entire building
B)properly seal and insulate air conditioning duct systems
C)invest in a highly advanced system upgrade
D)add more ductwork

Question 11

When determining the amount of moisture that must be added to a conditioned space, which of the following should be referenced?

A)AGA
B)AFUE
C)psychrometric chart
D)UL chart

Question 12

Which of the following is a characteristic of electric furnaces?

A)no fuel lines
B)combustion air intake
C)ductwork
D)inefficiency

Question 13

Which furnace configuration has airflow entering on one side and exiting out of the other?

A)downflow/counterflow
B)horizontal
C)lowboy
D)package/rooftop

Question 14

Noncondensing furnaces rated at 80 percent efficiency have a vent temperature of approximately:

A)350 ° F
B)550 ° F
C)250 ° F
D)105° F

Question 15

Condensation forming on window sills, and other areas where outdoor air may infiltrate a space is usually a sign of what?

A)low humidity level
B)malfunctioning thermostat
C)tightly wrapped building
D)excessive humidity level