Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • low voltage t-stat
  • aquastat
  • immersion controller
  • line voltage t-stat

2: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • sensible heat
  • evaporation of the water droplets

3: R22 and 410A operate at the same range of condensing and evaporating temperatures

  • true
  • false

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

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

5: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

6: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

7: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • increases
  • doesn't change
  • decreases
  • run as designed with low ambient controls

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

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

9: What measures gas pressure?

  • Hydrometer
  • Hygrometer
  • Manometer
  • Barometer

10: Start to Run windings will have what resistance?

  • All will be at equal values
  • The most resistance value
  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value

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

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

12: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • 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

13: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • breaker panel in
  • first disconnect in
  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • load-side of the contactor in

14: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • high limit control
  • low limit control

15: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

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

  • 1.2
  • .1
  • .8
  • 1.7

17: The density of a gas refers to

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

18: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 80%
  • 75%
  • 90%

19: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

20: Pi equals approximately

  • 3.41
  • 3.14
  • 12,000
  • 746

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

  • sugar
  • salt
  • soil
  • sand

22: Which of the following is not an air velocity meter?

  • Velometer
  • Hydrometer
  • Anemometer
  • Anemotherm

23: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

24: A start capacitor in series with a start winding will

  • increase starting torque
  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase running efficiency

25: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 58F
  • 77F
  • 32F
  • 70F