Chapter 100 Flashcards
0
Q
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%
A
B) 80-98%
1
Q
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
A
A) steam or hot water
2
Q
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
A
C) glycol heater
3
Q
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
A
D) blower noise can be carried through the ducts
4
Q
The heating coils in an electric warm air furnace are usually powered by \_\_\_\_ volts. A) 120 B) 150 C) 325 D) 240
A
D) 240
5
Q
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
A
B) 60,70