Chapter 99

Question 0

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

Answer 0

A) boiler or hot water supply line near the boiler

Question 1

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

Answer 1

B) balancing valve

Question 2

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

Answer 2

D) maintain it

Question 3

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

Answer 3

D) 83 kPa

Question 4

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

Answer 4

B) weak acid solution

Question 5

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

Answer 5

D) single stage centrifugal