Topics: ASHRAE/CMR
1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 18
- 24
- 36
2: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 2.5, 3.0
- 6.6, 6.6
- 2.5, 2.5
3: Ammonia can come in contact with _______ ?
- Aluminum
- Copper tubing
- Brass
- Copper
4: How many different groups of refrigerants are there?
- 15
- 11
- 3
- 7
5: Class A refrigerants are considered
- non-toxic
- flammable
- toxic
- non-flammable
6: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- pressure relief device
- zone valve
- high limit control
7: _____ and its alloys are suitable for use with ammonia systems.
- Magnesium
- Aluminum
- Zinc
- Copper
8: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Moisture indicator
- Foot valve
- Stop valve
- Muffler
9: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 350
- 250
- 400
- 100
10: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
11: High pressure controls should be set no higher than
- 25% of set point
- 80% of set point
- 90% of set point
- 10% of set point
12: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- III
- 10
13: 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
- 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
- high and low pressure controls
14: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- public assembly occupancy.
- commercial occupancy
15: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 2
- 1
- 5
- 3
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 refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
18: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
- Never can be allowed
19: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- the same
- lower
- higher
20: Which refrigerant replaced R-12?
- R-410A
- R-407A
- R-134A
- R-22
21: Liquid level gauges must be provided with what?
- A relief valve
- A red line
- A low level mark
- Automatic shut-offs
22: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class M machinery room
- Class B machinery room
- Class A machinery room
23: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and reciever
- between the compressor and oil separator
- between the compressor and the stop valve
24: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
25: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Magnesium
- Zinc