Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled
  • the heat gained by the condenser

2: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

3: On a centrifugal compressor, stationary diffuser vanes are needed to

  • increase the clearance space
  • convert velocity energy to pressure
  • prevent high pressure on the packing
  • stop gas flow

4: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • printed circuit board (PCB)
  • motor starter
  • duel-voltage switch

5: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 38
  • 96
  • 88
  • 58

6: No open flames are allowed in the machinery room unless?

  • Approved by the installing contractor
  • Never can be allowed
  • Only when combustion air is provided from outside of the machinery room
  • Approved by the authorized person

7: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .8
  • 1.7
  • 1.2
  • .1

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

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

9: A motor starter contains a thermal overload and a

  • contactor
  • transformer
  • 3-way relay
  • solenoid

10: Where a refrigeration or air conditioning system is installed,

  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • it shall not be operated below prescribed pressuers

11: The density of a gas refers to

  • pounds per absolute pressure
  • cubic feet per pound
  • pounds per cubic foot
  • pounds per square foot

12: When an electronic bridge is in balance the bridge output will be

  • 15 volts
  • .01 volts
  • 1 volt
  • 0 volts

13: Capacitors are rated in

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

14: E = I X R is

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

15: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • far apart or greater difference
  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • nearly the same

16: Adjusting the spring pressure on a TXV

  • makes no difference
  • changes subcooling
  • adjusts the bulb charge
  • changes superheat

17: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

18: A restaurant is classified as a

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

19: What type refrigerant is NOT ozone depleting?

  • HCFC
  • HFC
  • Halon
  • CFC

20: A halide torch is most useful with a freon compression system

  • to detect refrigeration leaks in piping joints
  • to remove from from TXV's and evaporator coils
  • to release a sticking valve
  • to sweat flanges on the refrigeration piping

21: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Latent heat
  • Specific heat
  • Enthalpy
  • Sensible heat

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

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

23: Secondary refrigerants are usually

  • expensive
  • alcohol
  • Prestone anti-freeze
  • water or brine

24: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

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

  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants