Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more concentrated
  • Rust can form
  • System operating pressure will drop
  • The Li-Br solution will become more diluted

2: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

3: Each machinery room shall contain

  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • high and low pressure controls

4: Copper and its alloys shall not be used with ammonia

  • True
  • False

5: Sublimation occurs when

  • gas is formed from a liquid
  • ice melts and turns to water
  • gas is formed directly from a solid
  • liquid is formed from a gas

6: Start to Run windings will have what resistance?

  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value
  • The most resistance value
  • All will be at equal values

7: How many refrigerant classifications are there for toxicity?

  • 2
  • 3
  • 1
  • 5

8: How are refrigerant blends classified?

  • Blends don't have to be classified
  • Based on the oil used
  • Based on worst case fractionation
  • Based on best case Fractionation

9: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 3.415
  • 6.830
  • 34.15
  • 16.64

10: Sensible heat is the heat added to a substance to

  • change its state
  • cause evaporation
  • freeze it
  • raise its temperature

11: The actual expansion curve of compressor follows most nearly which one of the following

  • Isothermal
  • Adiabatic
  • Volume
  • Pressure-Temperature

12: "R" represents ___ in the Ohm's law formula

  • voltage
  • resistance
  • amperage
  • capacitance

13: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 55 lbs
  • 120 lbs
  • 65 lbs

14: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Gate valve
  • Fusible plug
  • Rupture disk

15: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

16: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • regularly
  • quarterly
  • bi-annually
  • annually

17: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

18: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

19: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

20: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 100
  • 550
  • 50
  • 350

21: Evaporators within 18" of a heating coil must be equipped with a

  • high limit control
  • zone valve
  • pressure relief device
  • low limit control

22: A High-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system

23: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

24: Which winding have the most turns?

  • run
  • Start
  • depends on the motor phase
  • they have equal amount of turns

25: Booster compressors, pump refrigerant into the

  • heat & plate heat exchanges
  • receiver
  • low side of the primary compressor
  • high side of the secondary compressor