Topics: ASHRAE/CMR
1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 18
- 36
- 48
- 24
2: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
3: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 10
- 1
4: 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
5: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less
6: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug
7: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
8: R-22 falls under which safety classification?
- B-2
- A-2
- A-1
- B-1
9: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 2
- 3
- 1
10: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but flammable
11: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
12: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- pressure relief device
- low limit control
- zone valve
13: What is Trichlorotrifluoromethane?
- R-11
- R-113
- R-13
- R-12
14: What section governs pressure vessels?
- OSHA
- Section ASHREA 34
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
15: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Certified
- Coated
- Encased
16: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
18: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a fusible plug
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
19: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 110 lbs
- 120 lbs
20: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
21: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
22: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
23: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
24: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 10
- 15
- 25
25: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Circuit Breaker
- T&P device
- Relief valve