Topics: All categories in the pool
1: The best way to determine the voltage requirement for an electrical component is to
- check with the utility company
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- read the nameplate data
2: 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
3: How many groups of refrigerants are there?
- 5
- 3
- 1
- 7
4: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 1000F
- 600F
- 700F
5: Capacity control on a centrifugal compressor is accomplished by the
- slide vanes
- post-rotational guide vanes
- check valves
- pre-rotational guide vanes
6: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
7: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
8: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
9: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the liquid side of the system
- the vapor side of the system
- low side of the system
- high side of the system
10: One ton of refrigeration is defined as ______ btu/minute.
- 12,000
- 200
- 60
- 720,000
11: The first step in mechanical refrigeration is
- expansion
- compression
- evaporation
- condensation
12: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, mixed, and paraffin
13: A rule of thumb in air conditioning is ____ CFM per ton?
- 400
- 600
- 500
- 100
14: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 600 psig
- 200 psig
- 400 psig
15: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- outside the machinery room
- compressor
- evaporator
16: A chiller entering and leaving temperature difference is?
- 5 degrees F
- 20 degrees F
- 10 degrees F
- 50 degrees F
17: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Large mercantile
- Instituional
18: 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
19: What pipe can not be used for refrigeration?
- L
- K
- N
- M
20: Total heat of a substance is considered
- enthalpy
- sensible heat
- specific heat
- empathetical
21: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
22: R-22 falls under which safety classification?
- B-1
- A-2
- A-1
- B-2
23: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.5
- 1
- 2.2
- 1.2
24: What is a high-side float?
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
25: What type refrigerant is NOT ozone depleting?
- HFC
- CFC
- Halon
- HCFC