Topics: All categories in the pool
1: A water regulating valve opens when
- the compressor is on
- when the power is on
- the head pressure rises
- when the power is on there is an overcharge of refrigerant
2: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the expansion valve
- start the comrpessor
- start the fan and circulating pump
- reset the safety valve
3: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-12
- R-11
4: What must be done to refrigerant pipes before being buried?
- Encased
- Coated
- Leaked checked
- Certified
5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- .9776 watts
- 977.6 watts
- 9,776 watts
6: A class B1 refrigerant is considered
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
7: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- are obsolete.
- False
- depends on the type of refrigerant being used
8: What is the maximum voltage range allowed on an electrical circuit?
- 10%
- 20%
- 15%
- 5%
9: Which oil is hydoscopic?
- animal
- polyolester
- mineral
- SW30
10: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-22
- R-123
- R-12
11: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
12: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- PSIG
13: A micron is
- one thousandths of a millimeter
- a larger unit of measurement than Hg
- one millonths of a centimeter
- one millonths of a micrometer
14: Who is permitted to access a refrigeration machine room?
- Any employee
- Authorized persons only
- Contractors only
- Anyone, it's a completely safe area
15: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- lengthen the frost line
- shorten the frost line
- allow more liquid into the evaporator
16: Ammonia belongs to Group
- A-2
- A-1
- B-2
- B-1
17: Class T machine room
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
18: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- convert velocity energy to pressure
- increase the clearance space
- prevent high pressure on the packing
19: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- low head pressure
- not enough oil in the system
- oil in evaporator
- moisture in the system
20: Color is important in oil because
- it indicates the viscoisty.
- allows you to see into crankcase
- it makes sight glasses easy to read
- can tell us something about the refining of oil
21: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- lower chamber of the low side
22: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100
23: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High suction pressure and high discharge pressure.
- Low suction pressure and low discharge pressure
- Low head pressure and high suction pressure
- High head pressure and low suction pressure
24: Thermodynamics is the branch of science that deals with
- energy due to motion
- heat energy
- state of energy
- molecular therory
25: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b