Chapter 7 Warm Air Furnace Components & Maintenance

Question 1

1.The hot air distribution system that is ideal for buildings with a concrete slab floor and no basement is the _____ system.

A. Perimeter loop

B. Natural circulation

C. Perimeter radial

D. Forced circulation

E. Extended plenum

Answer 1

A. Perimeter loop

Question 2

2. A forced warm-air furnace consists of all but which of the components listed?

A. Dehumidifier

B. Blower or fan

C. Heat exchanger

D. Filter

E. Combustion equipment

Answer 2

A. Dehumidifier

Question 3

3. The purpose of the heat exchanger in a forced warm-air furnace is to exchange:

A. Hot water heat with air

B. Combustion gas heat with air

C. Air heat with combustion gases

D. Steam heat with air

E. Air heat with air

Answer 3

B. Combustion gas heat with air

Question 4

4. With a warm air heating system if there is insufficient heat throughout the building the trouble could be:

A. The bonnet temperature is at least 65°C (150°F)

B. Occupied and unoccupied areas receiving adequate heat

C. An adequate amount of air is supplied to all rooms and to provide good air distribution

D. Air filters are dirty

E. The thermostat is accurate

Answer 4

D. Air filters are dirty

Question 5

5. With a warm air heating system if there is insufficient heat throughout the building the trouble could be:

A. The bonnet temperature is at least 65°C (150°F)

B. Occupied and unoccupied areas receiving adequate heat

C. An adequate amount of air is supplied to all rooms and to provide good air distribution

D. Air filters are clean

E. The thermostat is inaccurate

Answer 5

E. The thermostat is inaccurate

Question 6

6. A _____ is a covering for any opening through which air passes.

A. Grille

B. Register

C. Fixed louvre register

D. Adjustable louvre register

E. Ceiling diffuse

Answer 6

A. Grille

Question 7

7. The hot air distribution system in which the supply air is delivered from a central plenum to each outlet by separate ducts and is mainly used in buildings with either crawl space or slab floor construction is the _____ system.

A. Perimeter loop

B. Perimeter radial

C. Natural circulation

D. Forced circulation

E. Extended plenum

Answer 7

B. Perimeter radial

Question 8

8. To determine the tension in a blowers driving belt, a force of about _____ should be applied.

A. 25 N (5.6 pounds force)

B. 30 N (6.7 pounds force)

C. 45 N (10 pounds force)

D. 75 N (17 pounds force)

E. 20 N (4.5 pounds force)

Answer 8

C. 45 N (10 pounds force)

Question 9

9. Fans and blowers usually give little trouble if kept clean and properly lubricated:

A. Monthly

B. Yearly

C. Daily

D. Weekly

E. Bi-annual

Answer 9

B. Yearly

Question 10

10. A _____ is a register with fixed bars or louvres which direct the air in a specific pattern.

A. Grille

B. Register

C. Fixed louvre register

D. Adjustable louvre register

E. Ceiling diffuser

Answer 10

C. Fixed louvre register

Question 11

11. It is common practice to use rectangular ducts for the _____ section of a duct system and circular ducts for the branch runs to the outlets.

A. Register

B. Return

C. Grille

D. Plenum

E. Supply

Answer 11

D. Plenum

Question 12

12. _____ are installed in branch ducts near their takeoff point on the plenum and are used to adjust the warm airflow to the various areas so that equal comfort conditions can be obtained throughout the building.

A. Registers

B. Louvers

C. Grilles

D. Plenums

E. Dampers

Answer 12

E. Dampers

Question 13

13. A _____ is a register with movable bars or louvres which allow the flow pattern of the air entering the room to be changed.

A. Grille

B. Register

C. Fixed louvre register

D. Adjustable louvre register

E. Ceiling diffuser

Answer 13

D. Adjustable louvre register

Question 14

14. A _____ is a grille equipped with a damper to control the amount of air passing through.

A. Grille

B. Register

C. Fixed louvre register

D. Adjustable louvre register

E. Ceiling diffuser

Answer 14

B. Register

Question 15

15. With a warm air heating system if there is insufficient heat throughout the building the trouble could be:

A. The bonnet temperature is at least 65°C (150°F)

B. Unoccupied areas receiving too much heat

C. An adequate amount of air is supplied to all rooms and to provide good air distribution

D. Air filters are clean

E. The thermostat is accurate

Answer 15

B. Unoccupied areas receiving too much heat

Question 16

16. From the plenum warm air flows into the _____ system which distributes the air.

A. Register

B. Return duct

C. Grille

D. Plenum

E. Supply duct

Answer 16

E. Supply duct

Question 17

17. The most commonly used duct system for warm air heating systems in small as well as large buildings is the _____ system.

A. Perimeter loop

B. Natural circulation

C. Extended plenum

D. Forced circulation

E. Perimeter radial

Answer 17

C. Extended plenum

Question 18

18. The purpose of the heat exchanger in a forced warm-air furnace is to exchange:

A. Hot water heat with air

B. Combustion gas heat with air

C. Air heat with combustion gases

D. Steam heat with air

E. Air heat with air

Answer 18

B. Combustion gas heat with air

Question 19

19. With a warm air heating system if there is insufficient heat throughout the building the trouble could be:

A. The bonnet temperature is at least 65°C (150°F)

B. Unoccupied areas receiving too much heat

C. An adequate amount of air is supplied to all rooms and to provide good air distribution

D. Air filters are clean

E. The thermostat is accurate

Answer 19

B. Unoccupied areas receiving too much heat