Topics: All categories in the pool
1: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- no
- yes
- yes, for systems under 10 tons
2: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When there is a space 6' or more above it
- When its white
- When it's used as part of a supply or return air system
3: Low ambient controls are used when
- when systems run all year round
- on air conditioning systems only
- always
- economizers are used
4: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 200
- 12,000
- 60
5: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- annually
- every 24 months
6: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-12
- R-123
- R-22
7: How many closing forces operate a thermostatic expansion valve?
- 1
- 2
- 4
- 3
8: What device should be used on low-temperature freezers?
- hot-gas by-pass
- oil separator
- high capacity TXV
- discharge muffler
9: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- nozzle
- baffle
- suction
10: Which occupancy can ammonia be used in?
- industrial
- redifential
- depends on the quantity of freon
- commercial
11: The oil separator is always inserted in the system
- to prevent oil logging
- where it can be easily serviced
- in the discharge line
- in a cool spot
12: The formula for Pure Power in a resistance circuit is
- Watts X amps.
- Watts = volts X amps
- Watts X power factor
- Kw = volts X amps
13: Heat transferred by conduction from one body to another is done
- via solids
- via liquids
- via radiation
- via heat rays
14: "R" represents ___ in the Ohm's law formula
- voltage
- resistance
- capacitance
- amperage
15: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 55
- 50
- 75
- 15
16: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
17: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Classifed
- Certified
18: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
19: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to balance the sine waves
- to keep the contactor pulled in
- to protect low voltage equipment
20: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 600F
- 1000F
- 700F
21: How many gallons of water per pound of ammonia do you need?
- 5
- 15
- 1
- 20
22: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
23: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
24: A moisture indicator must
- be filled with liquid
- change color when exposed to moisture
- be sight side up
- be yellow
25: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above