Hot Water Heating System Equipment And Operation

Front 1

Excessive pressure build-up due to a rise in temperature and the resulting expansion of the water in the system is prevented by the use of
a) a float tank
b) a relief valve
c) an expansion tank
d) a cushion valve
e) a safety valve

Back 1

C

Front 2

To prevent corrosion in the expansion tank it is sometimes filled with
a) nitrogen
b) air
c) oxygen
d) helium
e) hydrogen

Back 2

A

Front 3

Improper location of the circulating pump and expansion tank can cause
a) the circulating pump to cavitate
b) some points in the system to be under negative pressure
c) air to be drawn into the system
d) vapour bubbles to form in the circulating pump
e) all of the above

Back 3

E

Front 4

The expansion tank is normally attached to the
a) boiler or the hot water supply line near the boiler
b) highest point in the system directly above the boiler
c) supply line after the circulating pump
d) supply line above the lowest convector
e) return line directly before the boiler

Back 4

A

Front 5

The minimum reading on an altitude gage of a boiler in a large plant is from the top of the boiler to the highest point in the system plus
a) 0.6 m
b) 0.8 m
c) 1.0 m
d) 1.2 m
e) 1.4 m

Back 5

D

Front 6

The purpose of a pressure reducing valve is to
a) level out the flow of steam or hot water
b) automatically reduce pressure and maintain it
c) reduce water hammer in a heating system
d) maintain hot water at a required pressure
e) to reduce the feedwater pressure to the boiler

Back 6

B

Front 7

What type of boiler would you expect to find in a hot water system, incorporating a converter?
a) hot water boiler
b) steam boiler
c) forced circulation boiler
d) reverse flow boiler
e) once through boiler

Back 7

B