Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Suction valve unloaders afford an effective means of

  • superheat control
  • refrigerant control
  • capacity control
  • evaporator control

3: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less

4: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • leak checked
  • moisture barrier
  • insulated

5: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented

6: "E" references ____ in the Ohm's law formula

  • amperage
  • voltage
  • capacitance
  • resistance

7: 746 watts is equal to

  • 1 hp
  • 10 hp
  • Pi
  • 100 hp

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

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

9: The critical temperature of a refrigerant gas occurs when

  • the gas is no longer saturated
  • the gas returns to a liquid
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation

10: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • weak solution
  • diluted solution
  • strong solution
  • absorbed solution

11: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

12: What is a Category "D" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact

13: What is a Category "M" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • Any fluid that exceeds 150 psig and has design temperatures over 366F

14: Where must a refrigeration contractor's license number be displayed?

  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.

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

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

16: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

17: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 600 watts
  • 1000 watts
  • 5KW
  • 746 watts

18: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

19: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

20: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Critical temperature
  • Dry bulb temperature
  • Saturated temperature
  • Wet bulb temperature

21: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

22: A rule of thumb in air conditioning is ____ CFM per ton?

  • 500
  • 100
  • 600
  • 400

23: It takes how many BTU/hr to melt one pound of ice at 32F

  • 144
  • 970
  • 212
  • 180

24: What is R-22?

  • HFC
  • Chlorodifluoromethane
  • CCFCM
  • Chlorofluoromethane

25: The color code of a tank of ammonia is

  • white
  • lavender
  • light green
  • silver