B1-6 Steam And Water Heating Systems Flashcards Preview

Unit Tests > B1-6 Steam And Water Heating Systems > Flashcards

Flashcards in B1-6 Steam And Water Heating Systems Deck (50)
Loading flashcards...
0
Q

In a hot water heating system, the expansion tank is normally connected to the:
A) boiler or hot water supply line near the boiler
B) return line directly before the boiler
C) supply line above the lowest convector
D) highest point in the system directly above the boiler
E) supply line after the circulating pump

A

A) boiler or hot water supply line near the boiler

1
Q
In a pulse combination furnace, the stated efficiency is:
A) 94-98%
B) 80-95%
C) 70-75%
D) 60-70%
E) 50-60%
A

A) 94-98%

2
Q
A frequent means of heating facilities such as factories warehouses and garages is to use a:
A) pulse duct burner
B) unit heater
C) convector
D) radiator
E) fin fan
A

B) unit heater

3
Q
The power supply for an electric resistance coil furnace is usually :
A) 120 V
B) 180 V
C) 240 V
D) 480 V
E) 600 V
A

C) 240 V

4
Q
On a hiboy, or upflow furnace, the blower is located:
A) above the heat exchanger
B) beneath the heat exchanger
C) beside the heat exchanger
D) inside the heat exchanger
E) in any of the above locations
A

B) beneath the heat exchanger

5
Q
The blower used on a warm air furnace usually:
1) has a double inlet
2) has forward curved vanes
3) has backward inclined vanes
4) is a centrifugal type fan
5) handles warm air from the heat exchanger
A) 1,2 and 4 only
B) 1,2,4 and 5 only
C) 2,4 and 5 only
D) 2,3 and 4 only
E) 3,4 and 5 only
A

A) 1,2 and 4 only

6
Q
Among the duct systems employed for warm air heating, the most commonly used system is the:
A) extended plenum system
B) perimeter radial system
C) duct furnace system
D) perimeter loop system
E) combination system
A

A) extended plenum system

7
Q

In a gas fired warm air furnace, the combustion products usually travel through the heat exchanger channels from:
A) right to left and into the flue
B) bottom to top and into the flue
C) top to bottom and into the flue
D) left to right and into the flue
E) bottom to top to bottom and into the flue

A

B) bottom to top and into the flue

8
Q

“Perimeter heating” refers to a heating system that has its warm air outlets arranged:
A) along the outside walls of the building
B) only in the basement
C) in the floor, along the inside walls
D) within the ceiling
E) within the inside walls of each room

A

A) along the outside walls of the building

9
Q
The best filter for the removal of fine dust, smoke and fumes is the:
A) electrostatic filter
B) activated carbon filter
C) air washer
D) viscous filter
E) bag filter
A

A) electrostatic filter

10
Q
Objectionable odours may be removed from an air conditioning system by means of:
A) viscous filters
B) air washers
C) activated carbon filters
D) ultraviolet lamps
E) electrostatic filters
A

C) activated carbon filters

11
Q
Viscous filters are highly efficient in the removal of:
A) coarser dust and pollen
B) cooking odours
C) bacteria and spores
D) mists and fogs
E) fine dust, fumes, and smoke
A

A) coarser dust and pollen

12
Q
The substances in the airstream that can be sterilized by ultraviolet light are:
A) pollen and smoke
B) mists and fogs
C) dust and pollen
D) lint and dust
E) bacteria and spores
A

E) bacteria and spores

13
Q

Infrared heaters usually are installed:
A) at floor level with radiant energy directed upwards
B) in warm air supply ducts with radiant energy increasing the air stream temperature
C) in walls with radiant energy directed horizontally
D) overhead with radiant energy directed downward
E) in any location depending on the configuration of the room

A

D) overhead with radiant energy directed downward

14
Q
When energized, the Quartz lamp heating element will respond:
A) instantaneously
B) in a few seconds
C) in about 30 seconds
D) in about one minute
E) in about two minutes
A

B) in a few seconds

15
Q

Energy from a radiant heater:
A) is best suited to room heating in homes
B) travels in straight lines and warms the air at the same time
C) will not be reflected by any surface
D) travels in straight lines without warming the air
E) warms the air and transmits heat by convection currents

A

D) travels in straight lines without warming the air

16
Q
An infrared heater that must be used in a well ventilated area is the:
A) low temperature catalytic heater
B) surface combustion heater
C) internally fired heater
D) electric infrared heater
E) direct fired unit heater
A

B) surface combustion heater

17
Q
A radiator valve is used to control the amount of:
A) air leaving the radiator
B) steam leaving the radiator
C) air flowing over the radiator
D) steam entering the radiator
E) condensate leaving the radiator
A

D) steam entering the radiator

18
Q
A leaking steam trap will:
A) reduce the efficiency of the system
B) allow steam to leak into the radiator
C) reduce steam usage
D) reduce steam production
E) allow air into the system
A

A) reduce the efficiency of the system

19
Q
The level in a heating system condensate receiver is controlled by:
A) a float switch
B) a level throttling valve
C) an air pressure switch
D) a pressure reducing valve
E) an automatic overflow float valve
A

A) a float switch

20
Q
To increase heat transfer, unit heaters differ from convectors because they incorporate:
A) radiant elements
B) dampers
C) metal fins
D) auxiliary heat exchangers
E) blowers
A

E) blowers

21
Q
A frequent means of heating facilities such as factories, warehouses and garages, is to use a:
A) radiator
B) convector
C) fin fan
D) space heater
E) unit heater
A

E) unit heater

22
Q

If the water level falls too low during operation of a steam heating boiler, the operator should:
A) shut the boiler down
B) not be concerned, as heating boilers typically run with a low water level
C) immediately add more water
D) open the safety valve and then add more water
E) reduce the firing rate and add water slowly

A

A) shut the boiler down

23
Q

A Hartford loop is installed in a low pressure steam heating boiler to:
A) prevent boiler water from being forced back into the return line
B) relieve the steam pressure in the system
C) improve boiler level control
D) make the boiler more efficient
E) equalize the steam and water pressure

A

A) prevent boiler water from being forced back into the return line

24
Q
In a steam heating system, finned convectors should be kept free of:
A) moving air
B) steam
C) an electrostatic charge
D) cold drafts
E) dust
A

E) dust

25
Q

In a hot water system compared to a steam system, if there is a leak, damage will:
A) depend on where the boiler is located in the system
B) be greater in the steam system
C) be minimal due to the automatic drain system
D) be greater in the hot water system
E) be about the same in either system

A

D) be greater in the hot water system

26
Q
Automatic snow melting systems can use:
A) hot water and antifreeze mixed
B) electric resistance heating
C) infrared lamps mounted above sidewalks and ramps
D) hot water and ethylene glycol mixed
E) all of the above
A

E) all of the above

27
Q
A forced hot water circulating system can be classified as the:
A) loop system
B) one pipe system
C) two pipe direct return system
D) two pipe reverse return system
E) all of the above
A

E) all of the above

28
Q
In a hot water heating system incorporating a converter, you would expect to find:
A) a vacuum pump
B) a domestic hot water tank
C) a return trap
D) a UPS system
E) a steam boiler
A

E) a steam boiler

29
Q
An air separator should always be installed in a/an:
A) expansion tank
B) converter
C) cross tee
D) horizontal pipe
E) vertical pipe
A

D) horizontal pipe

30
Q
Hygroscopic means:
A) measures humidity
B) readily rejects any water
C) sensitive to heat
D) sensitive to temperature
E) readily absorbs water
A

E) readily absorbs water

31
Q

The purpose of a pressure reducing valve in a hot water system is to:
A) level out the flow of steam or hot water
B) reduce water hammer in a heating system
C) maintain hot water at a required pressure
D) periodically reduce pressure and maintain it
E) to reduce the feedwater pressure to the boiler

A

C) maintain hot water at a required pressure

32
Q

Flow control valves in a hot water system:
A) prevent gravity flow through the system
B) are controlled by the thermostat
C) control the rate of flow through the system
D) regulate air and water flow to the expansion tank
E) separate air from the system

A

A) prevent gravity flow through the system

33
Q
Air is removed from a hot water system by which of the following?
1) air vents
2) deaerators
3) air condensers
4) air separators
A) 1 and 3 only
B) 1 and 4 only
C) 2 and 3 only
D) 1 and 2 only
E) 2 and 4 only
A

B) 1 and 4 only

34
Q

In a pulse combustion condensing furnace:
A) a forced draft fan continuously supplies combustion air
B) the burner is of the ring type design
C) a spark plug is used continuously to ignite the combustion gas and air mixture
D) a higher chimney is required compared to other furnaces
E) the AFUE is between 94 and 98%

A

E) the AFUE is between 94 and 98%

35
Q

The advantage of using several duct furnaces instead of a single central furnace is:
A) better control of heat in each zone of the building
B) easier installation
C) lower maintenance cost
D) cleaner air due to better filtration
E) lower initial cost

A

A) better control of heat in each zone of the building

36
Q
High efficiency furnaces and heaters range in the annual fuel utilization efficiency (AFUE) between:
A) 94-98%
B) 80-95%
C) 70-75%
D) 60-70%
E) 50-60%
A

B) 80-95%

37
Q
In a arm air heating system, the cold air return registers are located:
A) in ceilings
B) under windows
C) in floors
D) in exterior walls
E) in interior locations
A

E) in interior locations

38
Q
The essential components of a forced warm air furnace include:
1) heat exchangers
2) blower and motors
3) combustion equipment
4) air filters
5) humidifiers
6) DX coils
A) 2 and 3 only
B) 1,2,3 and 4 only
C) 1,3 and 5 only
D) 1,2 and 3 only
E) 2,3,4 and 6 only
A

B) 1,2,3 and 4 only

39
Q

The blower motor of a warm air furnace is equipped with an adjustable pulley. Bringing the flanges of the pulley closer together will result in:
A) no changes in the blower speed
B) increasing blower speed
C) decreasing blower speed

A

B) increasing blower speed

40
Q
An example of a type of outlet in a warm air heating system is a/an:
A) grill
B) register
C) ceiling diffuser
D) perforated panel
E) all of the above
A

E) all of the above

41
Q
Electrostatic filters are highly efficient in the removal of:
A) dust and pollen
B) fine dust, smoke and fumes
C) bacteria and spores
D) lint
E) excess humidity
A

B) fine dust, smoke and fumes

42
Q
Natural ventilation of a building is improved by using:
A) a roof ventilator
B) mechanical air filters
C) aluminum siding
D) sidewall louvres
E) Dutch doors
A

A) a roof ventilator

43
Q
In a mechanical air intake natural exhaust ventilation system, the pressure in the building is:
A) slightly above atmospheric pressure
B) well below atmospheric pressure
C) well above atmospheric pressure
D) at atmospheric pressure
E) slightly below atmospheric pressure
A

A) slightly above atmospheric pressure

44
Q
Ventilation can be divided into two basic methods:
A) cold and warm air ventilation
B) forced and natural
C) forced and mechanical
D) natural and warm air
E) mechanical and natural
A

E) mechanical and natural

45
Q
Building ventilation mechanical air filters can be divided into two broad classes, namely:
A) electronic and dry
B) throwaway and renewable
C) viscous and electronic
D) dry and wet
E) viscous and nonviscous
A

B) throwaway and renewable

46
Q
The element for an open wire type electric heater is constructed of:
A) magnesium oxide
B) tungsten
C) Chrome-moly
D) mica
E) nickel chromium
A

E) nickel chromium

47
Q
In a tubular cased wire heating element, the compound surrounding the wire is:
A) magnesium oxide
B) potassium permanganate
C) calcium hydroxide
D) calcium chloride
E) aluminum oxide
A

A) magnesium oxide

48
Q

Compared to warm air heating systems, infrared heating is more suitable for industrial buildings with high bay structures because of:
A) improved comfort
B) improved safety
C) lower operating costs
D) smaller installation space requirements
E) reduced equipment costs

A

C) lower operating costs

49
Q

The infrared energy used for comfort heating:
A) is not economical in applications such as warehouses
B) travels in straight lines through air without warming it
C) is a form of electric energy
D) warms the surrounding air
E) is not cost effective when outdoors

A

B) travels in straight lines through air without warming it