Topics: All categories in the pool
1: While water is evaporated in an evaporative condenser the impurities which were in the water are
- accumulate in the sump water
- blown to the atmosphere by the fan
- remain in the air
- washed out of the air by the spray pump
2: Machinery rooms must be vented to ______?
- basement
- outdoors
- neutralizing tank
- unoccupied spaces
3: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
- 10-15 psi above low side pressure
4: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
5: A water regulating valve opens when
- the head pressure rises
- the compressor is on
- when the power is on
- when the power is on there is an overcharge of refrigerant
6: What would be the classification for Stop & Shop grocery store?
- Instituional
- Place of assembly
- Large mercantile
- Industrial
7: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
8: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Cascade
- Low pressure
- Simple
9: The outer portion of shell of the compressor used on low-pressure chillers is called the
- baffle
- nozzle
- suction
- volute
10: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
11: E = I X R is
- Amps Law
- Ohms Law
- Impedance Law
- Watts Law
12: Ammonia vaporization takes place at what temperature?
- -110F
- -28F
- -460F
- -32F
13: Ammonia is under what safety classification?
- B3
- B1
- B2
- A3
14: Pressure relief valves shall be marked with the data from
- Section VIII Division of the ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
15: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- increase the clearance space
- prevent high pressure on the packing
- convert velocity energy to pressure
16: By using nitrogen within a pipe during brazing operation,
- Copper oxide formation is prevented
- The explosion hazard is confined
- Discoloration is prevented
- Exterior scale formation is minimized
17: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
18: Sensible heat is the heat added to a substance to
- cause evaporation
- freeze it
- raise its temperature
- change its state
19: Total heat of a substance is considered
- empathetical
- enthalpy
- specific heat
- sensible heat
20: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 77F
- 58F
- 70F
- 32F
21: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- concentrated solution
- weak solution
- absorbed solution
22: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class M machinery room
- Class T machinery room
- Class A machinery room
- Class B machinery room
23: 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 R-11
- Flush with ammonia
- Flush with RX-11
24: A run capacitor is wired in series with the _____ windings.
- run
- common
- start capacitor
- start
25: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- low suction pressure
- high head pressure
- increased capacity