22 Flashcards
Prior to selecting a circulator for a hydronic heating system, what must be determined?
1)
Height of building and pipe size
2)
System resistance and pipe size
3)
System resistance and flow rate
4)
Height of building and flow rate
3)
System resistance and flow rate
Which hydronic heating boiler control device is used to adjust the boiler water temperature?
1)
Aquastat
2)
Pressurtrol
3)
Gas valve
4)
Low-water cut-off
1)
Aquastat
When chemicals are added to a hydronic heating system, which device or method is used to protect the potable water source against backflow?
1)
Air gap
2)
RP device
3)
DCVA
4)
PVB Device
2)
RP device
In a gravity hydronic heating system, what is the driving force that moves water through the system?
1)
A circulator pump
2)
Convection current
3)
Chemical additives
4)
Water pressure
2)
Convection current
In a reverse return two-pipe system, what is the primary benefit over a direct return two-pipe system?
1)
More efficient heating
2)
Equal flow distribution across all radiators
3)
Reduced pipe material cost
4)
Quicker installation
2)
Equal flow distribution across all radiators
What type of hydronic heating system typically uses a dedicated circulator pump for each zone?
1)
Gravity system
2)
Single-pipe system
Correct Answer
3)
Primary/secondary loop system
Incorrect Response
4)
Direct return two-pipe system
Which type of boiler would typically be used in a high-mass hydronic heating system?
1)
Cast iron boiler
2)
Electric boiler
3)
Condensing boiler
4)
water-tube boiler
1)
Cast iron boiler
Which of the following piping arrangements is known for preventing short-circuiting in a hydronic system?
1)
One-pipe system
2)
Reverse return system
3)
Primary/secondary loop system
4)
Direct return system
3)
Primary/secondary loop system
How are unit heaters generally classified?
1)
Gravity or forced
2)
Water-fed or air-fed
3)
Vertical or horizontal
4)
Low-volume or high-volume
3)
Vertical or horizontal
Where will a heating system that creates a very comfortable and energy efficient living space maintain a slightly warmer temperature?
1)
Near the floor
2)
Near the ceiling
3)
Near the inside walls
4)
Near the outside walls
1)
Near the floor
When will a human being feel comfortable?
1)
Relative humidity is maintained
2)
Room temperature is maintained
3)
Rate of body heat loss is controlled
4)
Outside weather conditions are controlled
3)
Rate of body heat loss is controlled
What is the primary function of a pressure reducing valve?
1)
Reduce city main water pressure
2)
Relieve excess pressure from the system
3)
Increase the system pressure above city main pressure
4)
Minimize the pressure differential between heat transfer units
1)
Reduce city main water pressure
How should a reduction in a hydronic heating main be achieved?
1)
Eccentric reducer, flat side down
2)
Eccentric reducer, flat side up
3)
Concentric reducer
4)
Bushing
2)
Eccentric reducer, flat side up
What does the term “EDR” refer to?
1)
Equal direct radiation
2)
Equal distribution radiation
3)
Equivalent direct remission
4)
Equivalent direct radiation
4)
Equivalent direct radiation
Where are unit heaters typically installed?
1)
Commercial offices
2)
Warehouses and garages
3)
Rooms in single family dwellings
4)
Residential basements and attics
2)
Warehouses and garages
What directs warm air from a unit heater to a specific area of the heated space?
1)
Spring hangers
2)
Fan blades
3)
Louvers
4)
Baffles
3)
Louvers
How is an insulated tank that is heated from a separate boiler to provide domestic hot water classified?
1)
Under fired
2)
Indirect fired
3)
Variably fired
4)
Remotely fired
2)
Indirect fired
What piece of equipment adds water to a hydronic heating boiler when the boiler pressure drops below setpoint?
1)
Flow control valve
2)
Pressure relief valve
3)
Water make-up valve
4)
Temperature regulating valve
3)
Water make-up valve
What is the change between cut-in and cut-out temperatures on a hydronic heating boiler referred to as?
1)
Range
2)
Variation
3)
Differential
4)
Changeover
3)
Differential
What are the OH&S regulations in regards to the maximum allowable stretch of the throat opening size of lifting hooks?
1)
Below 2%
2)
Below 3%
3)
Below 5%
4)
Below 15%
4)
Below 15%
When operating and lifting loads around power lines with a voltage of 50kv, what is the minimum distance needed to work safely?
1)
10ft
2)
20ft
3)
25ft
4)
30ft
1)
10ft