Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: one BTU equals

  • 12,000 hp
  • 31.4 hp
  • Pi
  • 3.41 hp

2: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

3: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Therm
  • 1 Kelvin
  • The rate of conduction
  • 1 BTU

4: Halo-carbon refrigerants cannot be used with what material?

  • Magnesium alloy
  • Aluminum
  • Copper
  • Stainless Steel

5: High pressure controls should be set no higher than

  • 25% of set point
  • 80% of set point
  • 90% of set point
  • 10% of set point

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

  • 100
  • 500
  • 400
  • 600

7: 746 watts is equal to

  • 10 hp
  • Pi
  • 100 hp
  • 1 hp

8: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 2
  • 1
  • 5
  • 3

9: The formula for Pure Power in a resistance circuit is

  • Kw = volts X amps
  • Watts = volts X amps
  • Watts X power factor
  • Watts X amps.

10: Where is the high-side float located on a chiller system?

  • discharge line
  • flash line
  • inside the chiller barrel
  • liquid line

11: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

12: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Electricity
  • Heat
  • Air

13: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

14: A relief valve discharge capacity is rated in

  • temperature minus pounds of air per second divided by release rate squared
  • Pounds of air per minute.
  • PSIG
  • PSIA

15: A High-Probablity system

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak from a failed connection or component of such system
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space

16: What is considered a cooling agent?

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

17: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • gas masks must be worn
  • explosion precautions must be taken
  • no flames shall be permitted
  • the owner shall be informed

18: Control systems can be classified by

  • safety
  • source of power
  • tonnage of system
  • economy of operation

19: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

20: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 55F
  • 32F
  • 58F
  • 45F

21: If the spring is adjusted to increase the superheat, this new setting will

  • have no effect on the frost line
  • allow more liquid into the evaporator
  • lengthen the frost line
  • shorten the frost line

22: What does an anemometer measure?

  • voltage
  • amperage
  • velocity
  • temperature

23: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • pick up voltage
  • boost voltage
  • lift voltage
  • run voltage

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

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

25: What kind of material can't be used on the outlet of a relief valve?

  • Aluminum
  • PVC
  • Copper
  • Stainless Steel