An automatic fill valve for a hot water boiler:
a. Will maintain maximum system pressure at all times
b. Operates to maintain a constant boiler water level
c. Is not mandatory
d. Operates to maintain a constant expansion tank level.
e. Can be used with an open tank system
Answer: C
Learn More :
Power Engineering Chapter 94
- During warm-up of a cold hot water boiler excessive pressure build-up is prevented by
- A hot water boiler is protected from over pressure by means of
- The expansion and contraction rod type of temperature relief device will open the valve at __________ degrees Celsius and close it at __________ degrees Celsius.
- With the fusible plug type of temperature relief device, the fusible plug will melt at __________ degrees Celsius and allow hot water to escape.
- Hot water heating boilers must be equipped with a
- When the pressure pointer of a closed system reads lower than the altitude pointer the
- The dial of a pressure gauge on a hot water boiler indicating SI units can be graduated in
- The lever handle of the shut-off cock between a pressure or altitude gauge and a hot water boiler should be __________ to the pipe in which it is located when the cock is open.
- Siphon is not required between a pressure or an altitude gauge and a hot water boiler since these boilers are
- When a closed expansion tank is used and the system is cold
- An altitude gauge on a hot water heating boiler is used to indicate:
- The entrained air in a hot water heating system is directed to the:
- When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the:
- A closed expansion tank is often equipped with:
- A closed type expansion tank in a hot water heating system must:
- A pressure or altitude gauge for a hot water heating boiler:
- In a closed expansion tank system an air separator:
- When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be:
- The temperature indicator of a hot water boiler should indicate water temperature:
- The pressure relief valve on a hot water boiler:
- If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate:
- The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure.
- Boiler stop valves shall be:
- The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set.