Topics: All categories in the pool
1: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 100%
- 90%
- 80%
2: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
3: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
4: 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
5: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser more efficient
- it would make the condenser less efficient
- it would cause the condenser to sweat
- it would have no effect on the condenser
6: What device should be used on low-temperature freezers?
- oil separator
- high capacity TXV
- discharge muffler
- hot-gas by-pass
7: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 44 lbs
- 22 lbs
- 13.9 lbs
- 6.6 lbs
8: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
9: How many flammability classifications are refrigerants in?
- 3
- 5
- 7
- 2
10: How many gallons of water per pound of ammonia do you need?
- 15
- 5
- 20
- 1
11: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
13: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
14: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
15: "E" represents _____ in the Watt's law formula.
- amperage
- voltage
- watts
- reactance
16: Class 3 refrigerants are
- toxic
- highly flammable
- non-flammable
- non-toxic
17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
18: What does an anemometer measure?
- voltage
- temperature
- velocity
- amperage
19: How many gallons of water do you need per pound of ammonia?
- 100
- 1
- 10
- 50
20: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
21: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
22: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and oil separator
- between the compressor and reciever
23: Name a reason that does not cause reduced condenser air quantity
- Dirty Coil
- High ambient temperature
- Prevailing winds
- Dirty fan blades
24: How much clearance do you need around the perimeter of electrical panels?
- 18"
- 12"
- 36"
- 24"
25: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
- the heat gained by the condenser