Chapeter 2: Steam Heating Equipment Flashcards
Radiators are constructed in such a manner as to present a _____________to radiate heat from the steam or hot water contained in the radiator.
A) Small internal volume
B) Large surface area
C) Pleasant appearance
D) Smaller area
B) Large surface area
Packless radiator valves have a _________ diaphragm that completely seals off the valve body to prevent steam from leaking out around the valve stem.
A) Copper
B) Bronze
C) Lead
D) Steel
B) Bronze
The exhauster consists of a series of ___________through which water is forced by the vacuum pump.
A) Nozzles
B) Venturis
C) Orifices
D) Pipes
A) Nozzles
The air vent consists of a small housing containing a sealed cylinder partially filled with _________.
A) Volatile liquid
B) Water
C) Steam
D) Compressed air
A) Volatile liquid
Unit ventilators are:
A) Baseboard type heaters
B) Floor radiators
C) Ceiling suspended unit heaters
D) Ceiling mounted unit heaters
E) Cabinet type heaters
E) Cabinet type heaters
A radiator valve is used to control the amount of:
A) Air leaving the radiator
B) Condensate leaving the radiator
C) Air entering the radiator
D) Steam leaving the radiator
E) Steam entering the radiator
E) Steam entering the radiator
Unlike convectors, unit heaters use what to increase heat transfer?
A) Natural circulation
B) Blowers
C) Copper tubes
D) Metal fins
E) Brass tubes
B) Blowers
An air vent is partially filled with volatile liquid so that:
A) The steam will flow in one direction only
B) When hot steam surrounds the cylinder, it causes the needle valve to open
C) When relatively cool air surrounds the cylinder, it causes the needle valve to open
D) The air will flow in one direction only
E) When relatively cool air surrounds the cylinder, it causes the needle valve to close
C) When relatively cool air surrounds the cylinder, it causes the needle valve to open
A radiator trap is a device that is used to:
A) Vent steam from the radiator
B) Depressurize a radiator
C) Allow only water to leave the radiator
D) Allow only air to leave the radiator
E) Allow only steam to leave the radiator
C) Allow only water to leave the radiator
Radiators and convectors should be placed:
A) In an enclosed area and away from windows
B) Close to the boiler
C) In a central location
D) Against outside walls and preferably under windows
E) Against inside walls
D) Against outside walls and preferably under windows
Unit ventilators may:
A) Supply only outside air
B) Supply only heated air
C) Supply a mix of heated air and outside air
D) Supply a mix of heated air, outside air, and recirculated air
E) All of the above
E) All of the above
In fin coil type heaters, individual room temperature is controlled by:
A) Switches
B) Supply ducts
C) Dampers
D) Air relays
E) Automatic valves
C) Dampers
The packless radiator valve has a bronze diaphragm that completely seals off the valve body to prevent:
A) Condensate collecting on the valve body
B) Steam pressure from become excessive
C) Steam from leaking out around the valve stem
D) Air from entering the radiator
E) Air from leaking out around the valve stem
C) Steam from leaking out around the valve stem
Reheat coils:
A) Are centrally located forced air units controlled by dampers
B) Usually serve only one room
C) Are not controlled
D) Are convection devices
E) Are not suitable for heating large buildings
A) Are centrally located forced air units controlled by dampers
The level in the condensate receiver is automatically controlled by a:
A) Sight glass
B) Float switch
C) Gate valve
D) Pressure reducing valve
E) Drain valve
B) Float switch
