Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A mercury bulb controller is not recommended for

  • line or low voltage use
  • low voltage use
  • use where vibration is severe
  • line voltage use

2: What is considered a cooling agent?

  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat when vaporization occurs

3: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection

4: 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 balanced head and friction head
  • GPM, pipe size, and equivalent head.
  • GPM and friction head

5: An accumulator can be located between the

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

6: If the power element of an expansion valve should lose its charge the valve would

  • overfeed the evaporator
  • underfeed the evaporator
  • go closed
  • go open

7: A moisture indicator must

  • be sight side up
  • be filled with liquid
  • be yellow
  • change color when exposed to moisture

8: What would be the classification for Stop & Shop grocery store?

  • Industrial
  • Large mercantile
  • Instituional
  • Place of assembly

9: A high side float is a

  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type valve that controls the crankcase oil level
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the amount of refrigerant stored in the receiver

10: Class 3 refrigerants are

  • non-flammable
  • toxic
  • highly flammable
  • non-toxic

11: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

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

  • regularly
  • quarterly
  • annually
  • bi-annually

13: The discharge relief valve is located (9.4.6)

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

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

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

15: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection

16: 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
  • 550 lbs
  • 660 lbs

17: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • EPR valve
  • EEV
  • Solenoid valve
  • CPR valve

18: A motor starter contains a thermal overload and a

  • solenoid
  • contactor
  • 3-way relay
  • transformer

19: A secondary coolant is defined as

  • 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
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.

20: 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.

  • 6.6, 6.6
  • 3.0, 3.5
  • 2.5, 2.5
  • 2.5, 3.0

21: Start to Run windings will have what resistance?

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

22: E = I X R is

  • Ohms Law
  • Amps Law
  • Impedance Law
  • Watts Law

23: R-11 has the greatest corrosive effect on

  • Bronze
  • Aluminum
  • Magnesium
  • Copper

24: The most common type of motor starter is

  • part winding starter
  • across the line starter
  • duel-winding starter
  • delts-wye starter

25: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above