Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The External equalizer of a TXV compensates for

  • pressure drop across the condenser coil
  • pressure within the system
  • pressure drop across the evaporator coil
  • pressure within the evaporator

2: What type of pressure relief device is used on a CO2 system?

  • Gate valve
  • Fusible plug
  • Rupture disk
  • Glove valve

3: R-123 belongs to Group

  • B-3
  • B-2
  • A-3
  • B-1

4: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

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

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

6: How many flammability classifications are refrigerants in?

  • 7
  • 2
  • 5
  • 3

7: What happens after your initial inspection of a pressure vessel?

  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected

8: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

9: Who authorizes changes to the safety codes?

  • Contractor who last serviced the system.
  • Person in charge of the facility
  • Board of Boilers
  • Person who pulled the permit

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

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

11: What is considered a cooling agent?

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

12: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation

13: Class T machine room

  • shall have remote controls to stop the action of the refrigerant compressor
  • has no flame producing apparatus permanently installed
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall include closets used for setting equipment

14: The first step in mechanical refrigeration is

  • evaporation
  • condensation
  • expansion
  • compression

15: R-12 is

  • dichlorofluoromethane
  • dichlorodifluoromethane
  • dichloromethane
  • trichlorofluoromethane

16: Gauge pressure is

  • force of pressure above that of atmospheric
  • atmospheric pressure
  • absolute pressure
  • what a gauge reads when checking pressures on a chilled water system.

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

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

18: A solder joint melts at temperatures of

  • less than 400F
  • 400F to 800F
  • 1,200F to 1,500F
  • 600F to 900F

19: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • high side of the system
  • low side of the system
  • the liquid side of the system
  • the vapor side of the system

20: Adjusting the spring pressure on a TXV

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

21: What are the three components of a transformer?

  • Primary coil, secondary coil, and copper contacts
  • Primary core, secondary coil, and high and low voltage connectors.
  • Primary coil, secondary coil, and core
  • Contacts, secondary coil, and core

22: How are safety controls wired in a circuit?

  • Either series or parallel
  • Series
  • Series/parallel
  • Parallel

23: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

24: 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.

25: 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

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