Topics: ASHRAE/CMR
1: How many groups of refrigerants are there?
- 1
- 3
- 7
- 5
2: What pipe can not be used for refrigeration?
- K
- N
- L
- M
3: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
4: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- At it's set pressure
- Two times it's working pressure
5: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 90%
- 75%
- 80%
6: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
7: 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
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- load-side of the contactor in
- breaker panel in
8: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
9: Ammonia can come in contact with _______ ?
- Aluminum
- Brass
- Copper tubing
- Copper
10: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
11: Who is permitted to access a refrigeration machine room?
- Contractors only
- Anyone, it's a completely safe area
- Any employee
- Authorized persons only
12: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-123
- R-12
- R-134A
13: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
14: Which refrigerant class listed below is the most flammable?
- A3
- C3
- B2
- A2
15: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
16: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UL and UM
- UM or UL
17: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Approved by the installing contractor
- Never can be allowed
18: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
19: 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
- outside the machinery room
- compressor
- boiler
- evaporator
20: What is R-22?
- HFC
- Chlorodifluoromethane
- CCFCM
- Chlorofluoromethane
21: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 40'
- At least 30'
- At least 20'
22: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- 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.
23: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 1
- 100
24: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the vapor side of the system
- high side of the system
- the liquid side of the system
25: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- B-2
- A-1