Book 2: 1-05 - "Hot Water Heating System Equipment & Operation" Flashcards
To prevent larger particles from reaching the circulating pump, it is common practice to install a temporary _____ in the suction line.
Select one:
A. Screen
B. Strainer
C. Blank
D. Disc
E. Filter
B. Strainer
Flow control valves are necessary in each circuit of hot water heating multi-zone pump system to:
Select one:
A. Prevent additional steam flow in the zone
B. Increase the circulation flow
C. Balance the circulation flow in all circuits
D. Prevent continued circulation of hot water after the circulator has been stopped by the zone control
E. Increase the efficiency of the zone heating
D. Prevent continued circulation of hot water after the circulator has been stopped by the zone control
Zone circuits in multi-zone hot water heating system require a/an _____ to provide the same flow resistance in each circuit.
Select one:
A. Air separator
B. Air vent
C. Zone pump
D. Balancing valve
E. Zone valve
D. Balancing valve
If vapour bubbles form in the inlet of a centrifugal pump this could cause _____ in the pump.
Select one:
A. Over pressure
B. Over heating
C. Cavitation
D. Under pressure
E. Lower temperature
C. Cavitation
The backflow prevention device is installed on the potable cold water:
Select one:
A. Supply line to the building
B. Feed line to the swimming pool
C. Feed line to the domestic hot water heater
D. Supply line to the fire suppression system
E. Feed line to the boiler
E. Feed line to the boiler
The air pressure in the diaphragm tank of a hot water heating system with the system pressure removed should typically be:
Select one:
A. 25 kPa (4 psi)
B. 100 kPa (15 psi)
C. 43 kPa (6 psi)
D. 83 kPa (12 psi)
E. 58 kPa (8 psi)
D. 83 kPa (12 psi)
A _____ valve, also called an automatic fill valve, is needed to keep a hot water heating system with a closed expansion tank automatically filled and under proper pressure.
Select one:
A. Pressure increasing
B. Gate
C. Globe
D. Ball
E. Pressure reducing
E. Pressure reducing
Special diverter fittings were required in _____ hot water heating systems to ensure an adequate flow of water through each convector.
Select one:
A. Two-pipe direct return
B. One-pipe
C. Two-pipe reverse return
D. Loop
E. Multi-zone
B. One-pipe
A steam to hot water heating converter is usually a _____ heat exchanger.
Select one:
A. Shell and tube
B. Radiator
C. Fire tube
D. Water tube
E. Convector
A. Shell and tube
Air in hot water heating systems collects in the _____ of piping and heating units.
Select one:
A. High spots
B. Horizontal mains
C. Vertical risers
D. Down comers
E. Return lines
A. High spots
If there is insufficient flow in the hot water system a probable cause would be the:
Select one:
A. Screen in pump section plugged
B. Thermostat working properly
C. Stop valves in return headers fully open
D. Stop valves in supply headers fully open
E. Aquastat working properly
A. Screen in pump section plugged
One of the chemicals used for the alkaline boil out solution is:
Select one:
A. Sodium chloride (salt)
B. Sodium sulphate (NaSO4)
C. Sodium sulphite (NaSO3)
D. Sodium carbonate (soda ash)
E. Calcium carbonate (CaCO3)
D. Sodium carbonate (soda ash)
In hydroid systems the expansion tank is a general term used to describe a piece of equipment for _____ in when heated.
Select one:
A. Air to expand
B. Water to expand
C. Water to heat
D. Steam to accumulate
E. Water to cool
B. Water to expand
Air separators used in hot water heating systems trap the air and direct it to the:
Select one:
A. Hot water heater
B. Expansion tank
C. Boiler
D. Convector
E. Radiator
B. Expansion tank
The use of the open expansion tank in hot water heating system is normally limited to a maximum water temperature of:
Select one:
A. 80°C (176°F)
B. 70°C (158°F)
C. 60°C (140°F)
D. 100°C (212°F)
E. 90°C (194°F)
A. 80°C (176°F)