Topics: All categories in the pool
1: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 44 lbs
- 13.9 lbs
- 6.6 lbs
2: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-11
- R-113
- R-12
3: How is bring measured?
- hydrometer
- manometer
- hygrometer
- anemometer
4: A Lithium-bromide system is an absorption system that
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses salts as an absorbent and lithium bromide as a refrigerant
5: What is used to check very low air pressures in air conditioning duct?
- Barometer
- Anemomter
- Manometer
- Vacuum gauge
6: How many gallons of water per pound of ammonia do you need?
- 20
- 5
- 15
- 1
7: One ton of refrigeration is defined as ______ btu/minute.
- 12,000
- 200
- 60
- 720,000
8: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Anyone, it's a completely safe area
- Authorized persons only
9: A single pole-double throw switch used how many wires excluding the ground wire?
- two
- five
- three
- four
10: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- Halon
- HCFC
11: Low pressure systems have what kind of compressor?
- Reciprocating
- Centrifugal
- Scroll
- Rotary
12: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 5/8"
- 3/8"
- 3/4"
13: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- CFC-11
- HCFC-123
- ammonia
- Lithium bromide
14: How would you know if there was a loss of crankcase pressure?
- oil will thicken
- oil level will rise
- oil will foam
- oil will thin out
15: The location of a thermal bulb of a TXV affects
- the amount of liquid returning to the compressor
- subcooling
- the amount of liquid in the condenser.
- the amount of liquid refrigerant in the evaporator
16: At higher altitudes, boiling temperatures
- depends on the refrigerant
- increase
- decrease
- are unaffected
17: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 1
- 10
18: "I" represents ____ in the Ohm's law formula.
- amperage
- resistance
- voltage.
- capacitance
19: The difference between saturated liquid and saturated vapor is
- heat
- volume
- temperature
- pressure
20: R-22 falls under which safety classification?
- B-1
- A-2
- A-1
- B-2
21: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
22: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
23: What refrigerant doesn't have to be classified?
- R-717
- R-134A
- R-422A
- R-718
24: The freezing point of water at sea level is?
- 0F
- -10C
- 32C
- 32F
25: What must be done to refrigerant pipes before being buried?
- Coated
- Encased
- Certified
- Leaked checked