Chapter 99 Flashcards
0
Q
The expansion tank is normally attached to the:
A) boiler or hot water supply line near the boiler
B) return line directly before the boiler
C) supply line after the circulating pump
D) supply line above the lowest convector
A
A) boiler or hot water supply line near the boiler
1
Q
To regulate the flow of water to a zone circuit, a \_\_\_\_\_ is used. A) diverter fitting B) balance valve C) gate valve D) pressure reducing valve
A
B) balancing valve
2
Q
The purpose of a pressure reducing valve is to automatically reduce pressure and:
A) admit more hot water to the expansion tank
B) the boiler firing rate
C) admit more hot water from the expansion tank
D) maintain it
A
D) maintain it
3
Q
For hot water heating systems in small buildings, the minimum operating pressure should be: A) 100 kPa B) 50 kPa C) 125 kPa D) 83 kPa
A
D) 83 kPa
4
Q
Which of the following chemicals is not used in the cleaning of hot water systems? A) soda ash B) weak acid solution C) sodium hydroxide D) tri sodium phosphate
A
B) weak acid solution
5
Q
The normal type of circulating pump used in hot water heating systems is: A) multi stage centrifugal B) diaphragm C) rotary D) single stage centrifugal
A
D) single stage centrifugal
