HVAC 6023 - Warm Air Furnace Components and Maintenance (Chp 7)

Question 1

Warm air furnace burners should be:
A) Blown out regularly
B) Pressure tested often
C) Adjusted often
D) Cleaned with a solvent regularly
E) Observed often for proper combustion

Answer 1

E) Observed often for proper combustion

Question 2

Dirty warm air furnace filters result in:
A) Low filter differential pressure
B) High motor energy consumption
C) Low filter efficiency
D) Low heat exchanger temperatures
E) Poor heating efficiency

Answer 2

E) Poor heating efficiency

Question 3

One common cause for warm air furnace heat exchange failure is:
A) Cracks on welded joints
B) Dry air entering the furnace
C) Cold air leaking into the building
D) Too much air entering the furnace
E) The holes in the fresh air duct

Answer 3

A) Cracks on welded joints

Question 4

A fan belt should be replaced:

A) When it breaks
B) At regular intervals
C) According to manufacturer’s recommendations
D) Before each heating season
E) When it shows signs of fraying, cracking or wear

Answer 4

E) When it shows signs of fraying, cracking or wear

Question 5

Heat exchangers in gas fired furnaces are made of:

A) Aluminium
B) Cast iron
C) Copper
D) Steel
E) Brass

Answer 5

D) Steel

Question 6

The greatest danger presented by a cracked heat exchanger on a warm air furnace is the possibility of:

A) Ethane in the air stream
B) Carbon monoxide entering the air stream
C) Carbon dioxide entering the air stream
D) Hydrogen sulphide entering the air stream
E) Raw fuel in the air stream

Answer 6

B) Carbon monoxide entering the air stream

NOTE: CARBON MONOXIDE

Question 7

Regular warm air furnace blower maintenance should include:

A) Shaft replacement
B) Pulley replacement
C) Casing replacement
D) Bearing replacement
E) Cleaning, lubrication and visual inspection

Answer 7

E) Cleaning, lubrication and visual inspection

Question 8

The perimeter loop system of furnace ducting is ideal for a building with:

A) No insulation in the walls
B) Low head room in the basement
C) No cold air returns
D) No basement
E) Concrete walls

Answer 8

D) No basement

Question 9

A humidifier is usually installed in the:

A) Warm air plenum
B) Fuel gas inlet
C) Combustion air inlet
D) Heat exchanger
E) Outside air vent

Answer 9

A) Warm air plenum