Topics: All categories in the pool
1: Booster compressors, pump refrigerant into the
- receiver
- high side of the secondary compressor
- low side of the primary compressor
- heat & plate heat exchanges
2: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- lower chamber of the low side
- upper chamber of the low side
- lower chamber of the high side
3: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
4: A low oil switch is typically
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
- manual reset
- automatic reset
5: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 3.0
- 2.5
- 2.0
6: The freezing point of water at sea level is?
- 0F
- -10C
- 32F
- 32C
7: Electricity involves the movement of electrons in atoms
- True
- False
8: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
9: "E" represents _____ in the Watt's law formula.
- reactance
- amperage
- watts
- voltage
10: A solder joint melts at temperatures of
- less than 400F
- 1,200F to 1,500F
- 600F to 900F
- 400F to 800F
11: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- low temperature superheated vapor
- a high temperature subcooled liquid
- a high temperature superheated vapor
12: In an electrical circuit, what is potential measured in?
- Ohms
- Herys
- Volts
- Amps
13: How much refrigerant can be stored in a mechanical room outside of the system?
- 100
- 330
- 150
- 200
14: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
15: A micron is
- one millonths of a micrometer
- one millonths of a centimeter
- one thousandths of a millimeter
- a larger unit of measurement than Hg
16: Relief valves are rated in
- pounds of air per hour
- gallons of water per minute
- gallons of water per hour
- pounds of air per minute
17: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
18: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
19: Sensible heat is the heat added to a substance to
- raise its temperature
- freeze it
- cause evaporation
- change its state
20: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-123
- R-22
- R-12
21: 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
- commercial occupancy
- illegal occupancy
22: "R" represents ___ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
23: The measurement of heat in a particular substance is
- enthalpy
- specific heat
- sensible heat
- latent heat
24: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
25: At higher altitudes, the boiling point of refrigerant is
- the same
- higher
- lower
- equal to the coefficient of water at 32F