Topics: ASHRAE/CMR
1: What is not a requirement of a class T machine room?
- self-closing doors
- automatic ventilation
- fire hose connection to the building fire protection system
- tight fitting doors
2: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
- nothing must be done
- place sign, check for leaks, insulate
3: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
4: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Relief valve
- Circuit Breaker
- T&P device
5: Can ammonia be used on domestic system?
- yes
- no
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
6: What refrigerant is an inorganic compound?
- R-22
- Ammonia
- R-410A
- R-132A
7: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
8: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
9: What kind of material can't be used on the outlet of a relief valve?
- Copper
- PVC
- Stainless Steel
- Aluminum
10: Where a refrigeration or air conditioning system is installed,
- the form or certificate shall be authorized by the Department of Public Safety
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
11: Who authorizes changes to the safety codes?
- Person in charge of the facility
- Person who pulled the permit
- Board of Boilers
- Contractor who last serviced the system.
12: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with RX-11
- Flush with ammonia
- Flush with R-11
- Flush with R-718
13: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- installed through a pipe casing
- leak checked
- insulated
14: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A red line
- A low level mark
15: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug
16: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
17: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 66
- 22
- 25
18: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
19: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 1
- 2
- 3
20: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
21: Evaporators within 18" of a heating coil must be equipped with a
- zone valve
- low limit control
- high limit control
- pressure relief device
22: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Add refrigerant
- Document the superheat and subcooling reading
23: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
24: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- B-1
- A-2
- A-1
25: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c