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
When using a sling, which orientation of the sling has the highest working load limit?
1)
Vertical Straight pull
2)
Choked Straight pull
3)
Basket Lift
4)
Single Pick Lift
3)
Basket Lift
What is the benefit of the Jib Hoist?
1)
Increased load capacity
2)
Reduced load capacity
3)
Extended reach
4)
Don’t need to lower the boom to the ground to install
3)
Extended reach
How much do nylon slings stretch?
1)
1 to 3 percent
2)
3 to 5 percent
3)
8 to 10 percent
4)
12 to 15 percent
3)
8 to 10 percent
What happens when you connect slings to a point below the loads center of gravity?
1)
Mechanical Advantage
2)
Balanced Load
3)
Toppling Load
4)
Un-Even Lift
3)
Toppling Load
How should a tag line be handled by the tag line holder when in use?
1)
Rap the line around your waste to secure load if it swings
2)
Keep one hand on line and direct traffic
3)
Keep the tag line loose encase its rubs up against the structure
4)
Keep the line taut
4)
Keep the line taut
What is the maximum angle an eye bolt can be loaded?
1)
22.5 degree
2)
30 degree
3)
35 degree
4)
45 degree
4)
45 degree
Hook rejection must occur if when the narrowest point has increased (stretched) what percentage from its original opening?
1)
2%
2)
5%
3)
10%
4)
15%
4)
15%
Hooks must be rejected if they’ve been twisted more then what degree of its cross-sectional area?
1)
5 degree or more
2)
10 degree or more
3)
15 degree or more
4)
20 degree or more
Hooks must be rejected if they’ve been twisted more then what degree of its cross-sectional area?
Incorrect Response
1)
5 degree or more
Correct Answer
2)
10 degree or more
3)
15 degree or more
4)
20 degree or more
How many slings should be put in a standard hook?
1)
1
2)
2
3)
3
4)
4
2)
2
What is the benefit of having more outer wires per strand on wire cables?
1)
Flexibility
2)
Load Resistant
3)
Weather Proof
4)
Fatigue Resistance
4)
Fatigue Resistance
The size of the shackle is determined by which part?
1)
Bow
2)
Bolt
3)
Pin
4)
Opening
1)
Bow
In what scenario is a rigid pipe hanger typically used?
1)
Where thermal expansion is a major concern
2)
Where no vertical movement of the pipe is desired
3)
Where lateral movement is required
4)
Where vibration needs to be absorbed
2)
Where no vertical movement of the pipe is desired
What type of support is typically used to support vertical piping?
1)
Guide
2)
Base support
3)
Roller
4)
Hanger
2)
Base support
Which pipe support allows for vertical and axial movement?
1)
Guide
2)
Spring hanger
3)
Anchor
4)
Rigid support
2)
Spring hanger
What is the purpose of an anchor support in a piping system?
1)
To allow free axial movement
2)
To restrict all movement
3)
To permit vertical movement
4)
To reduce vibration
2)
To restrict all movement
Which type of pipe support is designed to prevent the pipe from moving side to side?
1)
Hanger
2)
Guide
3)
Anchor
4)
Spring support
2)
Guide
What type of pipe support is best for high-vibration environments?
1)
Rigid support
2)
Spring support
3)
Snubber
4)
Roller support
3)
Snubber
What is the function of an insulation saddle on a pipe support?
1)
To reduce pipe movement
2)
To support thermal expansion
3)
To prevent heat transfer and pipe damage
4)
To absorb vibrations
3)
To prevent heat transfer and pipe damage
Which type of support would be used for a pipeline seismic zone?
1)
Rigid hanger
2)
Snubber
3)
Guide support
4)
Anchor
2)
Snubber
How does a variable spring support function?
1)
Supports constant load regardless of movement
2)
Supports load and allows for vertical movement with varying loads
3)
Prevents lateral movement
4)
Absorbs thermal expansion
2)
Supports load and allows for vertical movement with varying loads
Which of the following is a load-bearing support?
1)
Anchor
2)
Guide
3)
Hanger
4)
Brace
3)
Hanger
What is the role of a sway brace in a pipe support system?
1)
To prevent vertical movement
2)
To provide lateral stability
3)
To support thermal expansion
4)
To absorb shock
2)
To provide lateral stability
Which of the following is the maximum support spacing for horizontal PVC pipe?
1)
2200 mm
2)
1500 mm
3)
1600 mm
4)
1200 mm
4)
1200 mm
Which of the following is a benefit of using an adjustable pipe hanger?
1)
It can accommodate different pipe sizes
2)
It restricts thermal expansion
3)
It prevents pipe rotation
4)
It anchors the pipe in place
1)
It can accommodate different pipe sizes
Which type of pipe hanger is used to support horizontal pipelines from above?
1)
Roller Support
2)
Saddle Support
3)
Trapeze Hanger
4)
Guide
3)
Trapeze Hanger
Which type of pipe hanger is commonly used in seismic zones?
1)
Adjustable Clevis Hanger
2)
Rigid Clevis Hanger
3)
Seismic Restraint System
4)
Roller Support
3)
Seismic Restraint System
Which type of pipe hanger can accommodate both axial and lateral movement?
1)
Rigid Hanger
2)
Spring Hanger
3)
U-Bolt Hanger
4)
Roller Support
2)
Spring Hanger
What is the main advantage of using a trapeze hanger for horizontal pipes?
1)
It reduces noise
2)
It provides multiple support points
3)
It allows for vertical adjustment
4)
It prevents thermal expansion
2)
It provides multiple support points
Incorrect Response
Which Steel component listed below is not a steel shape used in the construction of pipe supports?
1)
RRT
2)
I Beam
3)
Channel
Incorrect Response
4)
Wide Flange
1)
RRT
In what application are riser clamps used in?
1)
Clamps pipe to I Beams
2)
Lifting pipe into hangers
3)
To support pipe as it passes through floor penetrations
4)
Is used with epoxy to mount supports on concrete structures
3)
To support pipe as it passes through floor penetrations
When an anchor is used in combination with pipe guides, pipe movement will be restricted to which direction?
1)
Linear movement
2)
Lateral movement
3)
No restricted movement
4)
Restricted in all directions
4)
Restricted in all directions
Where are ceiling plates mostly used?
1)
On tile
2)
On wood
3)
On steel I Beams
4)
On concrete ceilings
2)
On wood
