Topics: All categories in the pool
1: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Relief valve
- T&P device
- Circuit Breaker
2: What is the purpose of a trap in a vertical discharge line with an upward flow?
- To insure proper oil return to the compressor
- Prevents oil from draining back to the compressor during the off cycle
- Both a & b
- None of the above
3: Total heat of a substance is considered
- specific heat
- enthalpy
- sensible heat
- empathetical
4: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
5: What does “ultimate strength” mean?
- Design strength of the vessel or piping in a refrigeration system
- Stress at which rupture will occur
- Highest or design pressure allowed inside a machinery room
- None of the above
6: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- soil
- salt
- sand
7: When an electronic bridge is in balance the bridge output will be
- 1 volt
- 15 volts
- .01 volts
- 0 volts
8: How are safety controls wired in a circuit?
- Parallel
- Series
- Series/parallel
- Either series or parallel
9: Class 3 refrigerants are
- highly flammable
- non-toxic
- toxic
- non-flammable
10: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- OSHA approved
- Well-lit exit signs
- Locked doors
11: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 50
- 22
- 25
12: What is the maximum voltage range allowed on an electrical circuit?
- 20%
- 5%
- 15%
- 10%
13: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Latent heat
- Specific heat
- Sensible heat
- Enthalpy
14: A solder joint melts at temperatures of
- less than 400F
- 600F to 900F
- 1,200F to 1,500F
- 400F to 800F
15: Sensible heat is the heat added to a substance to
- change its state
- freeze it
- raise its temperature
- cause evaporation
16: What section governs pressure vessels?
- OSHA
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- Section 8 ASHREA 15 ASME unfired
17: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
18: What does an anemometer measure?
- voltage
- velocity
- amperage
- temperature
19: A declaration test is needed when the system contains more than
- 110 lbs
- 120 lbs
- 55 lbs
- 65 lbs
20: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
21: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- depends on the type of refrigerant being used
- are obsolete.
- False
- True
22: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in
23: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- between the compressor and oil separator
- on top of the condensor
- between the compressor and reciever
24: Which refrigerant replaced R-12?
- R-134A
- R-22
- R-410A
- R-407A
25: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above