Topics: ASHRAE/CMR
1: Ammonia can come in contact with _______ ?
- Aluminum
- Copper
- Copper tubing
- Brass
2: How are refrigerant blends classified?
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
3: A movie theater would be considered a
- mixed occupancy
- institutional occupancy
- public assembly occupancy
- commercial occupancy
4: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-718
- R-134A
5: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
6: What is not a requirement of a class T machine room?
- tight fitting doors
- automatic ventilation
- fire hose connection to the building fire protection system
- self-closing doors
7: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Self-closing doors
- Tight fitting doors
8: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-12
- R-11
- R-22
- R-113
9: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-2
- B-2
- A-1
10: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
11: 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
12: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Magnesium
- Aluminum
- Copper
13: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
14: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- the same
- higher
- lower
15: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
16: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
17: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- condenser
- service valve
18: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- evaporator
- compressor
- outside the machinery room
- boiler
19: Which occupancy can ammonia be used in?
- industrial
- commercial
- redifential
- depends on the quantity of freon
20: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
21: What section governs pressure vessels?
- OSHA
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- Section ASHREA 34
22: Class 3 refrigerants are
- highly flammable
- toxic
- non-flammable
- non-toxic
23: All electrical work done on refrigeration systems must comply with
- Department of Energy
- NEC and Massachusetts Modifications
- OSHA
- ASHREA-15 Section 9.2.1
24: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 3.0
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
25: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- PVC
- Magnesium alloy
- Copper