Topics: All categories in the pool
1: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
2: At higher altitudes, the boiling point of refrigerant is
- higher
- equal to the coefficient of water at 32F
- lower
- the same
3: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
4: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
5: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 330
- 200
- 100
6: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
7: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 1000 watts
- 5KW
- 746 watts
8: In a motor, an internal overload might open if
- there's an open start winding
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an excess current draw through the motor
9: The certificate of inspection
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted and protected from dirt, water, and other elements
10: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- gas masks must be worn
- no flames shall be permitted
- explosion precautions must be taken
11: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
12: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 90%
- 75%
- 80%
13: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 15
- 25
- 10
14: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- .9776 watts
- 9,776 watts
- 977.6 watts
- 9.776 watts
15: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 2.5, 2.5
- 6.6, 6.6
- 2.5, 3.0
16: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
17: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
18: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UV”
- “UL”
- “U” or “UM”
- “UM” and “UV”
19: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
20: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- 2F difference
- nearly the same
- a ling psychrometer doesn't have two theremometers.
21: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
22: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
23: What refrigerant were phased out in 2004?
- R-134a
- R-11
- R-12
- R-22
24: An accumulator can be located between the
- evaporator and compressor
- compressor and condenser
- condenser and evaporator
- first stage and second stage compressors
25: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head