Chapter 100

Question 0

High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from:
A) 90-100%
B) 80-98%
C) 70-75%
D) 60-70%

Answer 0

B) 80-98%

Question 1

In a fin coil heat exchanger, the primary source of heat for the exchanger is:
A) steam or hot water
B) hot glycol
C) hot oil
D) hot circulating air

Answer 1

A) steam or hot water

Question 2

Which of the following is not a type of heat source or heat exchanger used in forced warm air heating systems?
A) directly fired
B) electric resistance coil
C) glycol heater
D) fin coil heat exchanger

Answer 2

C) glycol heater

Question 3

Which of the following is not an advantage of a forced air heating system?
A) air may be cleaned by filters
B) air can be humidified by using a humidifier
C) positive air circulation promotes a more uniform temperature distribution
D) blower noise can be carried through the ducts

Answer 3

D) blower noise can be carried through the ducts

Question 4

The heating coils in an electric warm air furnace are usually powered by \_\_\_\_ volts.
A) 120
B) 150
C) 325
D) 240

Answer 4

D) 240

Question 5

In a pulse burner, the pulse combustion process occurs about \_\_\_\_ to \_\_\_\_ times per second.
A) 30,40
B) 60,70
C) 25,30
D) 40,50

Answer 5

B) 60,70