Topics: ASHRAE/CMR
1: How much refrigerant can be stored in a mechanical room outside of the system?
- 100
- 150
- 200
- 330
2: Class T machine room
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
3: Class 3 refrigerants are
- non-toxic
- toxic
- non-flammable
- highly flammable
4: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 100%
- 75%
- 80%
5: What is an example of institutional occupancy?
- Dorms
- Shopping mall
- Football stadium
- Hospital
6: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 550
- 50
- 350
- 100
7: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic but non-flammable
- non-toxic but flammable
- toxic and highly flammable
8: 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
9: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and oil separator
- between the compressor and reciever
10: A class B2 refrigerant is considered
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- toxic and non-flammable
11: 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
12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
13: 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
14: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
15: High pressure controls should be set no higher than
- 25% of set point
- 80% of set point
- 10% of set point
- 90% of set point
16: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-22
- R-12
17: How many flammability classifications are refrigerants in?
- 3
- 7
- 5
- 2
18: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
19: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
20: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- high pressure
- critical pressure
21: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
22: What is R-611’s ASHRAE Safety Code?
- C3
- B3
- B2
- A2
23: Relief valves are rated in
- gallons of water per minute
- pounds of air per hour
- pounds of air per minute
- gallons of water per hour
24: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- phosgene gas sening
- refrigerant sensing
- A group sensing
25: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 1000F
- 600F
- 800F