Topics: ASHRAE/CMR
1: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
2: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- Machinery rooms need not be vented
- the mechanical room housing the refrigeration system
- the outdoors
3: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
4: 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
- 350
- 50
- 100
5: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Gate valve
- Rupture disk
- Glove valve
6: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-12
- R-11
7: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
8: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
9: 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
10: What refrigerant is an inorganic compound?
- Ammonia
- R-132A
- R-22
- R-410A
11: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 18
- 48
- 24
12: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- safe access
- service manuals
13: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-2
- A-1
- B-1
14: 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
15: 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 20'
- At least 40'
- At least 30'
16: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can't change refrigerants
- place sign, check for leaks, insulate
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
17: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
18: When should a relief valve start to function?
- Before the purge station discharges
- At it's set pressure
- Two times it's working pressure
- 10 psi before it's set pressure
19: A relief valve shall be located at least ___ above grade.
- 25'
- 10'
- 15'
- 36'
20: How many refrigerant classifications are there for flammability?
- 3
- 7
- 2
- 1
21: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
22: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- higher
- there is no Group B1 refrigerants
- the same
23: Stop valves shall not be permitted between the system and the
- condenser
- relief valve
- bleed valve
- service valve
24: A High-Probablity 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 from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
25: How many gallons of water do you need per pound of ammonia?
- 50
- 10
- 100
- 1