HVAC 6021 - Steam Heating Equipment (Chp 2)

Question 1

Unit ventilators are:
A) Ceiling mounted unit heaters
B) Floor radiators
C) Ceiling suspended unit heaters
D) Cabinet type heaters
E) Baseboard type heaters

Answer 1

D) Cabinet type heaters

Question 2

A radiator valve is used to control the amount of:

A) Air entering the radiator
B) Condensate leaving the radiator
C) Steam entering the radiator
D) Air leaving the radiator
E) Steam leaving the radiator

Answer 2

C) Steam ‘‘entering’’ the radiator

NOTE: STEAM ‘‘ENTERING’’

Question 3

Unlike convectors, unit heaters use what to increase heat transfer?

A) Copper tubes
B) Natural circulation
C) Blowers
D) Brass tubes
E) Metal fins

Answer 3

C) Blowers

Question 4

An air vent is partially filled with volatile liquid so that:

A) When hot steam surrounds the cylinder, it causes the needle valve to open
B) The steam will flow in one direction only
C) When relatively cool air surrounds the cylinder, it causes the needle valve to open
D) When relatively cool air surrounds the cylinder, it causes the needle valve to close
E) The air will flow in one direction only

Answer 4

C) When ‘‘relatively cool air’’ surrounds the cylinder, it ‘‘causes the needle valve to open’’
NOTE: RELATIVELY COOL AIR

Question 5

A radiator trap is a device that is used to:

A) Allow only steam to leave the radiator
B) Depressurize a radiator
C) Allow only air to leave the radiator
D) Vent steam from the radiator
E) Allow only water to leave the radiator

Answer 5

E) Allow ‘‘only water’’ to leave the radiator

NOTE: ONLY WATER

Question 6

Radiators and convectors should be placed:

A) Close to the boiler
B) Against outside walls and preferably under windows
C) Against inside walls
D) In an enclosed area and away from windows
E) In a central location

Answer 6

B) Against outside walls and preferably under windows

Question 7

Unit ventilators may:

A) Supply a mix of heated air and outside air
B) Supply a mix of heated air, outside air and recirculated air
C) Do all the above
D) Supply only outside air
E) Supply only heated air

Answer 7

C) Do all the above

Question 8

In fin coil type heaters, individual room temperature is controlled by:

A) Supply ducts
B) Automatic valves
C) Switches
D) Dampers
E) Air relays

Answer 8

D) Dampers

Question 9

The packless radiator valve has a bronze diaphragm that completely seals off the valve body to prevent:

A) Air from leaking out around the valve stem
B) Air from entering the radiator
C) Steam pressure from become excessive
D) Condensate collecting on the valve body
E) Steam from leaking out around the valve stem

Answer 9

E) ‘‘Steam from leaking out’’ around the valve stem

NOTE: STEAM LEAKING OUT NOT AIR

Question 10

Reheat coils:

A) Usually serve only one room
B) Are not controlled
C) Are not suitable for heating large buildings
D) Are convection devices
E) Are centrally located forced air units controlled by dampers

Answer 10

E) Are centrally located forced air units controlled by dampers

Question 11

The level in the condensate receiver is automatically controlled by a:

A) Gate valve
B) Pressure reducing valve
C) Float switch
D) Sight glass
E) Drain valve

Answer 11

C) Float switch

Question 12

Convectors use _____ to increase heat transfer.

A) Radiators
B) Blowers
C) Metal fins
D) Brass tubes
E) Copper tube

Answer 12

C) Metal fins