Exam (elaborations)
Hot Water Boilers – Questions With Solutions
Hot Water Boilers – Questions With Solutions
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Hot Water Boilers – Questions With SolutionsBackflow preventers
A)
prevent water from flowing out of the expansion tank.
B)
prevent reverse flow in the distribution system.
C)
keep the domestic water out of the boiler water.
D)
keep the boiler water out of the drinking water. ✔️Ans - The answer is
KEEP THE BOILER WATER OUT OF THE DRINKING WATER. The backflow
preventer stops the boiler water from getting back into the drinking water.
Typical water pressure at a boiler at rest in a three-story house is
A)
1 to 5 psi.
B)
slightly higher than in a two-story home.
C)
lower than in a two-story home.
D)
5 to 10 psi. ✔️Ans - The answer is SLIGHTLY HIGHER THAN IN A TWO-
STORY HOME. The typical pressure for a boiler at rest in a three-story house is
10 to 15 PSI. It is likely to be close to 15 PSI because the boiler has to push
water up three stories. It isn't usually above 15 PSI, because that is the
maximum setting on most pressure-reducing valves.
If there is no water in the boiler, the low water cutout prevents the
A)
burner from firing.
B)
circulator from operating.
C)
pressure reducer from adding water.
, D)
entrapment of air in the air separator. ✔️Ans - The answer is BURNER
FROM FIRING. If there is no water in the boiler, the low water cutout prevents
the burner from firing.
How much heat is typically needed in an older poorly insulated home in the
northern United States?
A)
10 to 30 BTUS per square foot
B)
60 to 90 BTUS per square foot
C)
5 to 10 BTUS per square foot
D)
30 to 60 BTUS per square foot ✔️Ans - The answer is 30 TO 60 BTUS PER
SQUARE FOOT. In the northern U.S., older homes typically need 30 to 60 BTUs
per square foot. Modern homes that are better insulated and more
weathertight need roughly 20 to 30 BTUs.
Where is the best location for a radiator in a basement room, in an open
system (assuming the boiler is in the basement)?
A)
On the ceiling
B)
On the exterior wall
C)
Underneath the raised floor
D)
On the interior wall ✔️Ans - The answer is ON THE CEILING. The radiator
has to be high in the room if it is in a basement and an open system.
Otherwise, heat will never flow to that radiator.
What is the normal operating pressure in a boiler?
A)
9 to 12 psi
B)
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