Topics: All categories in the pool
1: A moisture indicator must
- change color when exposed to moisture
- be yellow
- be sight side up
- be filled with liquid
2: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
3: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
4: An air conditioning system rated for 36,000 BTU's is equivalent to
- two tons of cooling
- 12,000 tons of cooling
- three tons of cooling
- one ton of cooling
5: While water is evaporated in an evaporative condenser the impurities which were in the water are
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- remain in the air
- accumulate in the sump water
6: Ammonia can come in contact with _______ ?
- Copper tubing
- Aluminum
- Brass
- Copper
7: R-22 is considered a(n)
- HFC
- HCFC
- HCFCH
- CFC
8: The actual expansion curve of compression follows most nearly which one of the following curves?
- Pressure Temperature
- Adiabatic
- Isothermal
- Volume Temperature
9: Machinery rooms must be vented to ______?
- neutralizing tank
- unoccupied spaces
- basement
- outdoors
10: The location of a thermal bulb of a TXV affects
- the amount of liquid refrigerant in the evaporator
- subcooling
- the amount of liquid returning to the compressor
- the amount of liquid in the condenser.
11: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Nickel
- Copper
- Zinc
12: one BTU equals
- 3.41 hp
- Pi
- 12,000 hp
- 31.4 hp
13: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- methyl chloride
- ammonia
- R-718
- trichlorotrifluoromethane
14: 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
- 10-15 psi above low side pressure
- 10 to 15 psi below low side pressure
15: What would be the classification for Stop & Shop grocery store?
- Industrial
- Instituional
- Place of assembly
- Large mercantile
16: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 100% of its RLA speed
- 75% of its RLA speed
- 50% of its RLA speed
17: "E" represents _____ in the Watt's law formula.
- voltage
- amperage
- reactance
- watts
18: How many gallons of water per pound of ammonia do you need?
- 5
- 20
- 15
- 1
19: Booster compressors connect to the ____ side of the compressor
- low side
- oil side
- vapor
- liquid
20: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
21: Horizontal piping should be run level.
- True
- No, unless the supervisor on the job says so.
- Yes, if the condenser is located above the evaporator
- False
22: What is the boiling point of refrigerant governed by?
- P&T relationship
- Condenser sub-cooling
- Evaporator temperature
- Compressor RPM's
23: Cooling tower lowers condenser water temp by
- evaporative cooling
- running fans at 100%
- condensation
- running water thru a secondary heat exchanger
24: R-717 is
- carbon dioxide
- ammonia
- trichloromethane
- water
25: A secondary coolant is defined as
- any refrigerant direcly in contact with the cooling space for process cooling
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems