Topics: All categories in the pool
1: The low pressure oil safety switch
- must be reset manually
- never trips
- resets itself after the time delay has terminated
- resets itself automatically
2: The color code of a tank of ammonia is
- white
- light green
- lavender
- silver
3: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- 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
- Any fluid that exceeds 150 psig and has design temperature of over 366F
4: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
5: What instrument is used to measure very high resistance?
- voltmeter
- meg ohmmeter
- ammeter
- tape measure
6: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
7: 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
8: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
9: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
- Self-closing doors
10: Gauge pressure is
- Barometric pressure
- Force of pressure above that of atmosphere
- Atmospheric pressure
- Absolute pressrue
11: An electronic bridge circuit is basically a
- Wheatstone
- high voltage circuit
- 24 volt control circuit
- suspension
12: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 400
- 500
13: 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
14: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 144 BTU
- 24,000 BTU
- 12,000 BTU
15: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to release a sticking valve
- to sweat flanges on the refrigeration piping
16: R-12 is
- trichlorofluoromethane
- dichloromethane
- dichlorodifluoromethane
- dichlorofluoromethane
17: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Certified
- Classifed
- Insulated and installed in a pipe duct (Encased)
18: The Department that certifies the transportation of refrigerant is the
- DOT
- EPO
- RSES
- EPA
19: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
- Add refrigerant
- Have it inspected
20: All low-pressure chillers use which type of compressor?
- Reciprocating
- Scroll
- Centrifugal
- Rotary
21: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Latent heat
- Specific heat
- Enthalpy
- Sensible heat
22: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Under feed
- Over feed
- Stay open
23: How many refrigerant classifications are there for toxicity?
- 3
- 1
- 2
- 5
24: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
25: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy