Topics: All categories in the pool
1: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 5 CFM
- 15 CFM
- 20 CFM
2: 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 R-718
- Flush with RX-11
- Flush with R-11
- Flush with ammonia
3: Ammonia can come in contact with _______ ?
- Copper tubing
- Brass
- Aluminum
- Copper
4: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 144 BTU
- 970 BTU
- 24,000 BTU
5: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
6: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
7: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- True
- depends on the type of refrigerant being used
- False
8: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure drop across the evaporator coil
- pressure within the evaporator
9: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
10: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
11: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
12: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
13: Transformers are rated in
- volt-amps
- amps
- volts
- volts-ohms
14: What type refrigerant is NOT ozone depleting?
- Halon
- HFC
- HCFC
- CFC
15: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- RPM and CFM increase
- CFM and HP increase
- CFM and RPM decrease
- CFM and HP decrease
16: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 550
- 350
- 50
17: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
18: The absorber shell contains the
- condenser and the generator
- condenser, the evaporator, and the generator
- condenser and the absorber
- evaporator and the absorber
19: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Manometer
- Anemomter
- Barometer
20: Low ambient controls are used when
- when systems run all year round
- always
- economizers are used
- on air conditioning systems only
21: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
22: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution crystallizes.
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
23: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 43.3 psig
- 66.1 psig
- 50.2 psig
24: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- decreases
- run as designed with low ambient controls
- doesn't change
25: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- High side float
- Low side float
- TXV