Topics: All categories in the pool
1: When the compressor is below the condensor
- traps are needed on the oil return line
- traps are needed on the discharge line
- traps are not needed on this type of system
- traps are needed on the suction line
2: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
3: 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
4: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
5: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
6: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
7: Pressure is equivalent of
- Force X Area
- Force / Area
- Force
- Area X Force
8: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
9: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
10: Gauge pressure is
- Absolute pressrue
- Atmospheric pressure
- Force of pressure above that of atmosphere
- Barometric pressure
11: Start to Run windings will have what resistance?
- The least resistance value
- All will be at equal values
- Somewhere between the actual start winding and run winding resistance value
- The most resistance value
12: Watt's Law indicates Volts X Amps = _________.
- Current
- Watts
- Ohms
- Resistance
13: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
14: How many forces operate a thermostatic expansion valve?
- 4
- 2
- 3
- 1
15: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
16: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
17: Which occupancy can ammonia be used in?
- redifential
- commercial
- depends on the quantity of freon
- industrial
18: The color code of a tank of ammonia is
- silver
- lavender
- white
- light green
19: The generator shell contains the
- condenser, the evaporator, and the generator
- evaporator and the absorber
- condenser and the generator
- condenser and the absorber
20: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Copper
- Aluminum
- Magnesium alloy
21: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Stay open
- Over feed
- Close
22: Ammonia is under what safety classification?
- B3
- B2
- A3
- B1
23: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 75%
- 90%
- 80%
24: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusible plug
- rupture plug
- fusion plug
25: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.