Topics: All categories in the pool
1: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
2: A professional or office building would be considered what type of occupancy?
- business
- mercantile
- commercial
- public assembly
3: Transformers are rated in
- volts-ohms
- volt-amps
- volts
- amps
4: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When there are sprinklers above
- When its white
- When it's used as part of a supply or return air system
5: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Stay open
- Over feed
- Close
6: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
7: The leaving chilled water set point for comfort cooling is typically?
- 60
- 66
- 45
- 38
8: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-12
- R-134A
- R-22
9: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- ammonia
- methyl chloride
- trichlorotrifluoromethane
10: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- decreases
- doesn't change
- run as designed with low ambient controls
- increases
11: Ammonia (NH3) is a group III refrigerant
- True
- False
12: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will thicken
- oil will foam
- oil level will rise
13: Can you use Ammonia in industrial applications?
- No, never
- Yes, always
- When mixed with R-718
- Yes, Under certain condidtions
14: Which is considered the more efficient condenser?
- spray cooled
- air cooled
- water cooled
- fan cooled
15: 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
16: What is potential measured in?
- Ohms
- Henrys
- Volts
- Amps
17: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 50
- 18
- 22
18: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 25% of its RLA speed
- 100% of its RLA speed
- 75% of its RLA speed
19: Ammonia belongs to Group
- A-1
- B-2
- B-1
- A-2
20: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or less
- 3 cubic feet or more
- 15 square feet or less
21: Each machinery room shall contain
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
22: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- increased capacity
- low suction pressure
- high head pressure
23: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- there is no Group B1 refrigerants
- higher
- the same
24: What is an egress?
- An entrance or exit
- An escape route
- A valve put on the low side of the system to prevent frosting
- A code violation
25: How many different groups of refrigerants are there?
- 3
- 15
- 7
- 11