Topics: ASHRAE/CMR
1: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Anyone, it's a completely safe area
- Any employee
- Contractors only
2: What is an example of institutional occupancy?
- Football stadium
- Hospital
- Shopping mall
- Dorms
3: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 15
- 75
- 20
- 50
4: A class A3 refrigerant is considered
- toxic and non-flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
5: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Magnesium
- Nickel
- Zinc
6: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-12
- R-113
- R-502
7: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- bi-annually
- regularly
- annually
- quarterly
8: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
9: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
10: 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
11: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- there is no Group B1 refrigerants
- higher
- the same
12: How many flammability classifications are refrigerants in?
- 3
- 7
- 2
- 5
13: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 1/8"
- 3/32"
14: How many gallons of water do you need per pound of ammonia?
- 50
- 1
- 10
- 100
15: A High-Probability 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
- 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
16: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
17: What is an egress?
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
- An escape route
18: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Encased
- Certified
- Coated
19: When should a relief valve start to function?
- At it's set pressure
- 10 psi before it's set pressure
- Two times it's working pressure
- Before the purge station discharges
20: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “U” or “UM”
- “UV”
- “UM” and “UV”
- “UL”
21: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
22: 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
23: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
24: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
25: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door