Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When there are sprinklers above
  • When it's used as part of a supply or return air system
  • When there is a space 6' or more above it

2: 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

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

  • True
  • False

4: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the warmest evaporator
  • Suction line of the coolest evaporator
  • Suction line at the compressor
  • Suction line prior to the accumulator of the lowest temperature system

5: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • place sign, check for leaks, insulate
  • you can't change refrigerants
  • make sure it's compatible, notify owner, notify A.H.J
  • nothing must be done

6: On a single phase motor, when does the start winding cut out?

  • At 50% of its full rated speed
  • At 75% of its full rated speed
  • At 25% of its full rated speed
  • Start windings do no cut-out of the run cycle

7: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • the owner shall be informed
  • no flames shall be permitted
  • gas masks must be worn
  • explosion precautions must be taken

8: What measures gas pressure?

  • Manometer
  • Barometer
  • Hygrometer
  • Hydrometer

9: What refrigerant is an inorganic compound?

  • R-410A
  • R-22
  • R-132A
  • Ammonia

10: 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'

11: In an electrical circuit, what is potential measured in?

  • Volts
  • Ohms
  • Amps
  • Herys

12: Which occupancy can ammonia be used in?

  • redifential
  • depends on the quantity of freon
  • industrial
  • commercial

13: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

14: One atmosphere equals

  • 0 psig
  • 14.7
  • 29.4
  • 0 psia

15: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • remain in the air
  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump

16: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

17: Before replacing a seized compressor, the _______ should be determinded.

  • designed head pressure
  • current draw
  • cause of seizure
  • type of refrigerant

18: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

19: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 BTU
  • 1 Kelvin
  • 1 Therm
  • The rate of conduction

20: Volts x amps equals

  • Inductance
  • Ohms Law
  • Watts
  • Impedance

21: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • concentrated solution
  • weak solution
  • absorbed solution

22: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Certified
  • Classifed
  • Leak checked
  • Insulated and installed in a pipe duct (Encased)

23: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would make the condenser less efficient
  • it would have no effect on the condenser
  • it would make the condenser more efficient
  • it would cause the condenser to sweat

24: A secondary coolant is defined as

  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • 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 low temperature refrigerant used for cascading systems

25: All electrical work done on refrigeration systems must comply with

  • Department of Energy
  • OSHA
  • NEC and Massachusetts Modifications
  • ASHREA-15 Section 9.2.1