Topics: All categories in the pool
1: When must refrigeration system covered by the code be inspected?
- Upon installation
- Annually and when installed
- Not required
- Annually
2: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UM” and “UV”
- “UV”
- “UL”
- “U” or “UM”
3: Color is important in oil because
- it indicates the viscoisty.
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- allows you to see into crankcase
4: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-134A
- R-718
5: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-500
- R-410A
- R-134A
6: How far from the ground does a relief valve need to be?
- At least 25' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
7: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is a self-contained complete factory made and tested system
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
8: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
9: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
10: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 16.64
- 34.15
- 3.415
- 6.830
11: The evaporator is a device to
- store liquid refrigerant
- absorb heat into the refrigeration system
- Keep the compressor busy
- remove heat from the refrigeration system
12: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
- a high temperature subcooled liquid
13: What do you need to do when you install a new system?
- Have it inspected
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
- Add refrigerant
14: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- High side float
- Low side float
- TXV
15: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat lost by the medium being cooled
- the heat gained by the condenser
- the heat of compression
16: Suction valve unloaders afford an effective means of
- refrigerant control
- capacity control
- evaporator control
- superheat control
17: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
18: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings
- three run windings and 3 start windings
19: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- institutional occupancy
- illegal occupancy
- commercial occupancy
20: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
21: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 125 psig
- 365 psig
- 255 psig
- 327 psig
22: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- prevent high pressure on the packing
- convert velocity energy to pressure
- increase the clearance space
23: R-11 has the greatest corrosive effect on
- Copper
- Aluminum
- Magnesium
- Bronze
24: The measurement of heat in a particular substance is
- sensible heat
- latent heat
- specific heat
- enthalpy
25: A hotel is considered a _______ occupancy.
- commercial
- institutional
- residential
- mercantile