P99 LOW PRESSURE BOILERS CH.9 EXAM QUESTIONS AND THEIR EXPECTED ANSWERS

P99 LOW PRESSURE BOILERS
CH.9 EXAM QUESTIONS AND THEIR
EXPECTED ANSWERS

Hot water heating systems produce heat more
consistently than steam heating systems.
True
Hot water heating systems require less water than
steam heating systems.
False
The natural circulation hot water heating system uses
circulating pumps to transport water in the system.
False
Water becomes less dense as it is heated.
True
The natural circulation hot water heating system uses
a compression tank to absorb pressure changes.
False
Natural circulation hot water heating systems are
commonly used in large contemporary buildings.
False
Floor-mounted circulating pumps are used in small
plants.
False
Line-mounted circulating pumps operate
intermittently, depending on plant requirements.
True

, The forced circulation hot water heating system is
vented to the atmosphere.
False
The aquastat controls the starting and stopping of the
burner on a hot water boiler.
True
The flow control valve prevents natural circulation
when water is not pumped in the forced circulation hot
water system.
True
The pressure-reducing valve is used to prevent
overpressure of water supplied to the expansion tank.
False
Diverter fittings are used to vent air from the heating
units.
False
Stop valves before and after the pressure-reducing
valve allow servicing of the pressure-reducing valve.
True
The three-way mixing valve blends water returning
from the heating units with supply water from the
boiler.
True
All boilers are manufactured in conformance with
Section I or IV of the ASME Boiler and Pressure
Vessel Code.
True
An aquastat controls the burner by sensing steam
pressure in a hot water boiler.
False