Topics: All categories in the pool
1: An air conditioning system rated for 36,000 BTU's is equivalent to
- three tons of cooling
- two tons of cooling
- one ton of cooling
- 12,000 tons of cooling
2: Which refrigerant is lighter than air?
- R-11
- R-134a
- R-123
- R-717
3: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of low temperature evaporator
- outlet of the liquid line
4: Clearance volume
- has no effect on compressor capacity
- is the same on all compressors
- affects compressor capacity
- varies depending on compressor speed
5: Capacity control on a centrifugal compressor is accomplished by the
- check valves
- pre-rotational guide vanes
- post-rotational guide vanes
- slide vanes
6: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
7: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
8: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat of compression
- the heat giving by the condenser
- the heat lost by the medium being cooled
9: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
10: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- R-414B
- Cascade
- Simple
11: What would be the classification for Stop & Shop grocery store?
- Instituional
- Industrial
- Place of assembly
- Large mercantile
12: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- evaporation of the water droplets
- sensible heat
13: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11
14: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the comrpessor
- reset the safety valve
- start the fan and circulating pump
- reset the expansion valve
15: The reversing valve is commonly used
- on multiple compressor systems
- on all heat pumps
- on commercial system that involve two different temperatures
- when the code requires a check valve
16: What is Absolute Zero?
- -400F
- -460F
- -773F
- -640F
17: Lithium-bromide, Li-Br, is best characterized as a
- sand
- sugar
- soil
- salt
18: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
19: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection and a rupture disc
20: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
- When its white
21: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
22: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
23: R-717 is
- ammonia
- trichloromethane
- water
- carbon dioxide
24: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 6.6, 6.6
- 2.5, 3.0
- 2.5, 2.5
- 3.0, 3.5
25: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and frost line
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, paper method, and frost line.