Topics: All categories in the pool
1: A hissing noise at the expansion valve is a good indication that
- gas is passing thru it
- nothing is passing thru
- liquid is passing thru it
- expansion valve is oversized
2: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- high head pressure
- increased capacity
- low suction pressure
3: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
4: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- Halon
- HCFC
5: Color is important in oil because
- allows you to see into crankcase
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- it indicates the viscoisty.
6: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
7: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
8: A VRF system is a direct system
- true
- false
9: R-22 falls under which safety classification?
- B-1
- A-2
- A-1
- B-2
10: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-123
- R-134A
- R-12
11: 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
12: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- three tons of cooling
- two tons of cooling
- one ton of cooling
13: Name a reason that does not cause reduced condenser air quantity
- High ambient temperature
- Prevailing winds
- Dirty fan blades
- Dirty Coil
14: What instrument is used to measure very high resistance?
- voltmeter
- tape measure
- meg ohmmeter
- ammeter
15: The location of a thermal bulb of a TXV affects
- the amount of liquid returning to the compressor
- subcooling
- the amount of liquid in the condenser.
- the amount of liquid refrigerant in the evaporator
16: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use fusible plugs
17: What would be the classification of a church?
- Institutional
- Industrial
- Large mercantile
- Place of assembly
18: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- institutional occupancy
- commercial occupancy
- mixed occupancy
- public assembly occupancy
19: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 100
- 75
- 24
- 50
20: 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
21: R-11 has the greatest corrosive effect on
- Bronze
- Copper
- Magnesium
- Aluminum
22: How many square inches per square foot?
- 24
- 98
- 64
- 144
23: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
24: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- No, never
- Yes, always
- When mixed with R-718
25: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2.5
- 1250
- There isn't enough information to answer.
- 2