Topics: All categories in the pool
1: Give an example of a secondary coolant?
- R-717
- R-410A
- R-718
- R-12
2: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 200 ohms
- 500 ohms
- 20 ohms
3: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- outlet of the liquid line
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
4: A capacitor in series with the start windings will do what?
- Decrease the RLA to within 10% of its rating
- Increase starting torque
- Nothing
- Increase run efficiency by 10% of its rating
5: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
7: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- explosion precautions must be taken
- the owner shall be informed
- gas masks must be worn
- no flames shall be permitted
8: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-134A
- R-410A
- R-500
9: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-11
- R-113
- R-12
10: Increasing superheat will do what to your frost line?
- Nothing
- Could either increase or decrease depending on the load conditions
- Increasae
- Decrease
11: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
12: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 75%
- 90%
- 100%
13: A hissing noise at the expansion valve is a good indication that
- gas is passing thru it
- nothing is passing thru
- liquid is passing thru it
- expansion valve is oversized
14: "I" represents ____ in the Ohm's law formula.
- amperage
- resistance
- voltage.
- capacitance
15: 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.
- “UM” and “UV”
- “UL”
- “UV”
- “U” or “UM”
16: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
- 75% of its RLA speed
17: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 5.5
- 2.0
- 3.0
18: Booster compressors connect to the ____ side of the compressor
- low side
- oil side
- vapor
- liquid
19: Which of the following is not an air velocity meter?
- Velometer
- Hydrometer
- Anemometer
- Anemotherm
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 500 lbs
- 660 lbs
21: Ammonia is under what safety classification?
- B2
- B3
- B1
- A3
22: "R" represents ___ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
23: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 5KW
- 600 watts
- 746 watts
- 1000 watts
24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- depends on the type of refrigerant being used
- False
- True
25: Secondary refrigerants are usually
- Prestone anti-freeze
- alcohol
- expensive
- water or brine