Topics: All categories in the pool
1: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
2: One atmosphere equals
- 0 psig
- 29.4
- 0 psia
- 14.7
3: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
4: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- installed through a pipe casing
- leak checked
- insulated
5: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
6: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
7: Which occupancy can ammonia be used in?
- industrial
- depends on the quantity of freon
- commercial
- redifential
8: What type of oil is used in R-410A systems?
- mineral oil
- polyalkylene glycol (PAG)
- naphthene
- polyolester (POE)
9: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 21F
- 11F
- 29F
- 9F
10: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- trichlorotrifluoromethane
- methyl chloride
- ammonia
11: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- 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 failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
12: A self contained system
- is a complete factory made and tested system
- is a unit system Group I refrigerants only
- is a unit system Group II refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
13: An example of an "Expendable Refrigerant" is
- lithium bromide
- liquid nitrogen
- ammonia
- liquid oxygen
14: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
15: What is a megaohm meter?
- 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 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
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
16: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
17: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-22
- R-12
- R-134A
18: Booster compressors connect to the ____ side of the compressor
- liquid
- oil side
- vapor
- low side
19: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
20: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with RX-11
- Flush with ammonia
- Flush with R-11
- Flush with R-718
21: How many volts would you read on a 480V system phase to phase?
- 277
- 480
- 1/3 the voltage
22: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
23: What does an anemometer measure?
- voltage
- temperature
- velocity
- amperage
24: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 20 degrees F
- 5 degrees F
- 10 degrees F
25: The most common type of motor starter is
- delts-wye starter
- duel-winding starter
- part winding starter
- across the line starter