Topics: All categories in the pool
1: What is NOT a positive displacement compressor.
- Rotary
- Reciprocating
- Scroll
- Centrifugal
2: How many BTU's is produced by one watt of energy
- 2.57
- 1
- 3.41
- 3.00
3: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- The rate of conduction
- 1 BTU
- 1 Kelvin
- 1 Therm
4: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
5: The actual expansion curve of compression follows most nearly which one of the following curves?
- Adiabatic
- Isothermal
- Pressure Temperature
- Volume Temperature
6: How many forces operate a thermostatic expansion valve?
- 1
- 3
- 4
- 2
7: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
8: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent of fittings multiplied by 2.31
9: What pipe can not be used for refrigeration?
- N
- L
- K
- M
10: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
11: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
- the form or certificate shall be authorized by the Department of Public Safety
12: Foaming of oil in a compressor is most likely to occur
- when there is insufficient air across the condenser(i.e., dirty coil)
- at start-up
- when the evaporator temperatures are below 32F
- when ambient temperature are low
13: How many groups of refrigerants are there?
- 3
- 5
- 7
- 1
14: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/16"
- 5/16"
- 1/8"
15: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
16: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- nearly the same
- far apart or greater difference
- a ling psychrometer doesn't have two theremometers.
17: The two float-type metering devices are the
- liquid float and the low-side float
- high-side float and the low-side float
- vapor float and the low-side float.
- liquid float and the vapor float
18: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
19: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- A-2
- B-1
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: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- every 18 months
- annually
22: Electricity involves the movement of electrons in atoms
- True
- False
23: R-717 is
- water
- ammonia
- carbon dioxide
- trichloromethane
24: 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
25: 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