Topics: All categories in the pool
1: 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
2: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Upon installation
- Not required
- Annually
3: Transformers are rated in
- volts
- volts-ohms
- amps
- volt-amps
4: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 1
- 100
5: The formula for Pure Power in a resistance circuit is
- Watts = volts X amps
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
6: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
7: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Under feed
- Close
- Over feed
8: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-500
- R-410A
- R-134A
9: The proper location for an oil separator is between the
- condenser and receiver
- receiver and metering device
- compressor and condenser
- evaporator and compressor
10: One atmosphere equals
- 0 psia
- 29.4
- 14.7
- 0 psig
11: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- when the compressor is off
- to allow easy compressor start-up
12: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 5KW
- 600 watts
- 1000 watts
13: 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
14: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
15: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 90%
- 75%
16: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1K amps
- 106 amps
- 1.6 amps
17: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- R-414B
- Simple
18: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- lower
- higher
- the same
19: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
20: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
21: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- installed through a pipe casing
- insulated
- leak checked
22: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- outside the machinery room
- evaporator
- compressor
23: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
24: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- leaking discharge valves in the compressor
- plugged drier
- overcharge of oil
25: Copper and its alloys shall not be used with ammonia
- True
- False