Topics: All categories in the pool
1: A class A3 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
2: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
3: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
4: Pi equals approximately
- 3.41
- 3.14
- 12,000
- 746
5: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase gas flow
- Increase liquid flow
- Nothing
6: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
7: Control systems can be classified by
- economy of operation
- safety
- tonnage of system
- source of power
8: Can you use Ammonia in industrial applications?
- Yes, always
- Yes, Under certain condidtions
- No, never
- When mixed with R-718
9: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 1000F
- 600F
- 700F
10: Color is important in oil because
- it indicates the viscoisty.
- can tell us something about the refining of oil
- allows you to see into crankcase
- it makes sight glasses easy to read
11: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
12: Where a refrigeration or air conditioning system is installed,
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
13: Ammonia can come in contact with _______ ?
- Copper tubing
- Brass
- Copper
- Aluminum
14: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 10,000
- 100
15: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 44 lbs
- 22 lbs
- 13.9 lbs
- 6.6 lbs
16: Ammonia is under what safety classification?
- A3
- B2
- B1
- B3
17: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
18: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
19: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- There is no minimum for relief valve and windows.
- At least 40'
- At least 20'
20: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- False
- depends on the type of refrigerant being used
- True
21: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
22: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
23: The evaporator is a device to
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
- Keep the compressor busy
24: How many different groups of refrigerants are there?
- 7
- 3
- 11
- 15
25: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class M machinery room
- Class A machinery room