Topics: All categories in the pool
1: A single pole-double throw switch uses how many wires?(excluding the ground)
- 4
- 5
- 3
- 2
2: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- Halon
- HCFC
3: Color is important in oil because
- allows you to see into crankcase
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- it indicates the viscoisty.
4: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
5: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
6: R-12 is
- trichlorofluoromethane
- dichloromethane
- dichlorodifluoromethane
- dichlorofluoromethane
7: A low oil switch is typically
- automatic reset
- time-delay auto reset
- manual reset
- non used on semi-hermetic compressors over 10 ton capacity
8: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 2
- 5
- 1
9: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 5.5
- 2.0
- 3.0
10: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- green
- orange
- red
11: A capacitor in series with the start windings will do what?
- Decrease the RLA to within 10% of its rating
- Increase starting torque
- Nothing
- Increase run efficiency by 10% of its rating
12: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
13: The certificate of inspection
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
- shall be $20 and an additional fee of $1 for each tone above 20 tons
14: What type of oil is used in R-410A systems?
- polyolester (POE)
- mineral oil
- naphthene
- polyalkylene glycol (PAG)
15: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIG
- PSIA
- temperature minus pounds of air per second divided by release rate squared
16: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- low pressure
- critical pressure
17: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
18: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
19: All low-pressure chillers use which type of compressor?
- Reciprocating
- Scroll
- Centrifugal
- Rotary
20: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- three tons of cooling
- two tons of cooling
- one ton of cooling
21: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's cheap
- Because it's water
- R-718 is not rated unlimited because it's a dangerous refrigerant
22: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
23: What is the minimum size wire you can use on a 30 amp circuit?
- 12 AWG
- 16 AWG
- 10 AWG
- 14 AWG
24: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
25: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- lower
- there is no Group B1 refrigerants
- the same