Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The freezing point of water at sea level is?

  • -10C
  • 32F
  • 32C
  • 0F

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

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

3: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • passing thru the tubes from top to bottom
  • removing the latent heat of fusion
  • water sprayed over condenser

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

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

5: A class B1 refrigerant is considered

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

6: 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

7: Lithium-bromide, Li-Br, is best characterized as a

  • sugar
  • sand
  • soil
  • salt

8: Thermodynamics is the branch of science that deals with

  • state of energy
  • heat energy
  • energy due to motion
  • molecular therory

9: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the low side
  • lower chamber of the high side
  • upper chamber of the high side

10: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type N
  • Type K
  • Type L

11: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 7.25'
  • 9.00'
  • 8'4"
  • 7.00'

12: Capacitors are rated in

  • volt - amperes
  • megaohms
  • kelvins
  • micro-farads

13: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will thicken
  • oil will foam
  • oil level will rise

14: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

15: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Moisture indicator
  • Stop valve
  • Muffler
  • Foot valve

16: What is used to check very low pressure?

  • Hygrometer
  • Manometer
  • Velometer
  • Hydrometer

17: The rupture disc on a low-pressure chiller typically releases pressure at

  • 15 psig
  • 5 psig
  • 0 psig
  • 10 psig

18: Which occupancy can ammonia be used in?

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

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

  • Pressure-Temperature
  • Isothermal
  • Volume
  • Adiabatic

20: 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)

21: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 330
  • 1,000
  • 6.6
  • 110

22: How many gallons of water do you need per pound of ammonia?

  • 50
  • 100
  • 10
  • 1

23: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 110
  • 100
  • 80
  • 90

24: How many flammability classifications are refrigerants in?

  • 2
  • 7
  • 5
  • 3

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

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