Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and unbalanced head and friction head
  • GPM and friction head
  • GPM, pipe size, and equivalent head.

2: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution crystallizes.

3: 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 amount of refrigerant stored in the receiver
  • 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

4: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

5: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

6: RPM's of a centrifugal compressor are at approximately?

  • 15,000
  • 30,000
  • 500
  • 10,000

7: How many groups of refrigerants are there?

  • 7
  • 5
  • 3
  • 1

8: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Copper
  • Nickel
  • Zinc
  • Magnesium

9: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

10: 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
  • 50
  • 350
  • 550

11: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or less
  • 15 cubic feet or more
  • 3 cubic feet or more
  • 15 square feet or less

12: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

13: Increasing superheat will do what to your frost line?

  • Increasae
  • Nothing
  • Could either increase or decrease depending on the load conditions
  • Decrease

14: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

15: Which winding have the most turns?

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

16: Low ambient controls are used when

  • economizers are used
  • always
  • on air conditioning systems only
  • when systems run all year round

17: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • the same
  • there is no Group B1 refrigerants
  • lower
  • higher

18: 1 HP = ____ Watts?

  • 3,412
  • 3.1416
  • 11,239
  • 746

19: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

20: B3 refrigerants are considered

  • toxic and highly flammable
  • non-toxic but flammable
  • non-toxic but non-flammable
  • toxic but non-flammable

21: "P" represents ______ in the Watt's law formula

  • voltage
  • reactance
  • amperage
  • watts

22: On a pumpdown system, the liquid-line solenoid is controlled by the

  • defrost timer
  • low pressure switch
  • low-ambient controller
  • thermostat

23: 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

24: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

25: What is a megaohm meter?

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