Topics: ASHRAE/CMR
1: Ammonia can come in contact with _______ ?
- Brass
- Copper
- Aluminum
- Copper tubing
2: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 700F
- 800F
- 1000F
3: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-123
- R-22
- R-12
4: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
5: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
6: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
7: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
8: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- place sign, check for leaks, insulate
- nothing must be done
9: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 24
- 48
- 18
10: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- At least 40'
- There is no minimum for relief valve and windows.
- At least 30'
11: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Nickel
- Copper
- Magnesium
12: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 24
- 18
- 15
- 10
13: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in
14: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Stop valve
- Moisture indicator
- Foot valve
15: What do you need to do when you install a new system?
- Have it inspected
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Add refrigerant
16: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 80%
- 90%
- 75%
17: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
18: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
19: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
- When there are sprinklers above
20: How many gallons of water per pound of ammonia do you need?
- 5
- 15
- 20
- 1
21: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
22: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
23: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
24: Each machinery room shall contain
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 330 lbs
- 500 lbs
- 660 lbs