Topics: All categories in the pool
1: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
2: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 80%
- 90%
- 100%
3: A capacitor in series with the start windings will do what?
- Increase run efficiency by 10% of its rating
- Increase starting torque
- Nothing
- Decrease the RLA to within 10% of its rating
4: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 25' above grade
- At least 15' above grade
- At least 20' above grade
5: A motor starter contains a thermal overload and a
- transformer
- solenoid
- 3-way relay
- contactor
6: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- pick-up voltage
- run voltage
- boost voltage
7: What measures gas pressure?
- Manometer
- Hygrometer
- Barometer
- Hydrometer
8: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
9: Give an example of a secondary coolant?
- R-718
- R-12
- R-717
- R-410A
10: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UM or UL
- UL and UR
- UL and UM
11: 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
12: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
- pressure within the evaporator
- pressure within the system
13: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 226 psig, 68 psig
- 350 psig, 120 psig
- 455 psig, 185 psig
14: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
15: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- PVC
- Stainless steel
16: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 2 months
- 14 days
- 1 week
17: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 400
- 500
18: A Low-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
19: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
- At 50% of its full rated speed
- At 75% of its full rated speed
20: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
21: How are safety controls wired in a circuit?
- Series
- Either series or parallel
- Parallel
- Series/parallel
22: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Simple
- Low pressure
- Cascade
23: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- System operating pressure will drop
- The Li-Br solution will become more concentrated
- Rust can form
- The Li-Br solution will become more diluted
24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- commercial occupancy
- institutional occupancy
- public assembly occupancy
25: What is NOT a positive displacement compressor.
- Scroll
- Reciprocating
- Rotary
- Centrifugal