Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Refrigerant restricted in 2004 but used for transition for decades:

  • R-11
  • R-123
  • R-134A
  • R-22

2: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

3: The discharge relief valve is located (9.4.6)

  • between the compressor and reciever
  • between the compressor and oil separator
  • between the compressor and the stop valve
  • on top of the condensor

4: An accumulator can be located between the

  • condenser and evaporator
  • compressor and condenser
  • first stage and second stage compressors
  • evaporator and compressor

5: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 30 days
  • 2 months
  • 14 days
  • 1 week

6: The generator shell contains the

  • condenser, the evaporator, and the generator
  • evaporator and the absorber
  • condenser and the absorber
  • condenser and the generator

7: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • blue
  • red
  • green
  • orange

8: How much refrigerant can be stored in a mechanical room outside of the system?

  • 200
  • 150
  • 100
  • 330

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

  • Pressure-Temperature
  • Volume
  • Isothermal
  • Adiabatic

10: 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

11: A start capacitor in series with a start winding will

  • increase running efficiency
  • decrease the amp draw of the motor
  • increase starting torque
  • increase the amp draw of the motor

12: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

13: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 10 amps
  • 20 amps
  • 5 amps
  • 15 amps

14: 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

15: Relief valves are rated in

  • gallons of water per minute
  • gallons of water per hour
  • pounds of air per hour
  • pounds of air per minute

16: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Prevailing winds
  • Dirty Coil
  • Dirty fan blades

17: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

18: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

19: Suction line oil traps should be installed when the condenser is

  • in the basement and the evaporator is on the third floor
  • on the third floor roof and the evaporator is in the basement
  • more than 100' away from the evaporator
  • located outside the operates in temperatures below 35F

20: How far from the window does a relief valve need to be according to ASHRAE-15?

  • There is no minimum for relief valve and windows.
  • At least 20'
  • At least 40'
  • At least 30'

21: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • stainless steel
  • black iron
  • magnesium

22: A restaurant is classified as a

  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy
  • large mercantile occupancy

23: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

24: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 80 ohms
  • 27 ohms
  • 71 ohms
  • 104 ohms

25: 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.