Topics: All categories in the pool
1: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
2: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
3: By using nitrogen within a pipe during brazing operation,
- Copper oxide formation is prevented
- Discoloration is prevented
- The explosion hazard is confined
- Exterior scale formation is minimized
4: Ammonia is under what safety classification?
- B3
- B1
- B2
- A3
5: Halogen refrigerants are corrosive to which type of metal?
- copper
- black iron
- magnesium
- stainless steel
6: A device used to measure small pressure differences is the
- manometer
- anemometer
- phsycometirc
- pyrometer
7: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Close
- Over feed
- Under feed
8: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UL and UM
- UM or UL
9: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- B-2
- A-1
10: A movie theater would be considered a
- public assembly occupancy
- commercial occupancy
- institutional occupancy
- mixed occupancy
11: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
12: The instrument used to measure the specific gravity of absorption chiller solutions is the
- Psychrometer
- anemometer
- refractometer
- hydrometer
13: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 1
- 100
14: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Moisture and air
- Water and soap
- Oil and water
15: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
16: Foaming of oil in a compressor is most likely to occur
- when ambient temperature are low
- at start-up
- when there is insufficient air across the condenser(i.e., dirty coil)
- when the evaporator temperatures are below 32F
17: Mercury was used in thermometers primarily because it
- never freezes
- vaporizes at very high temperatures
- expands uniformly
- was inexpensive
18: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
19: What measures gas pressure?
- Hydrometer
- Manometer
- Barometer
- Hygrometer
20: The main purpose of the accumulator is to
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
- provide space for vapor to accumulate
21: "P" represents ______ in the Watt's law formula
- voltage
- watts
- amperage
- reactance
22: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- neutral chamber-type compressor
- negative displacement compressor
- non-positive displacement compressor
- non-volumetric displacement compressor
23: Stop valves shall not be permitted between the system and the
- service valve
- relief valve
- condenser
- bleed valve
24: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
25: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Latent heat
- Enthalpy
- Sensible heat
- Specific heat