Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A relief valve shall be located at least ___ above grade.

  • 36'
  • 10'
  • 25'
  • 15'

2: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 10%
  • 20%
  • 15%

3: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 365 psig
  • 255 psig
  • 125 psig
  • 327 psig

4: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.

5: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 10 amps
  • 24 amps
  • 20 amps

6: Pi equals approximately

  • 746
  • 3.41
  • 3.14
  • 12,000

7: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • high head pressure
  • low suction pressure
  • increased capacity

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

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

9: An electronic bridge circuit is basically a

  • Wheatstone
  • high voltage circuit
  • suspension
  • 24 volt control circuit

10: 1 HP = ____ Watts?

  • 746
  • 3.1416
  • 11,239
  • 3,412

11: 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

12: When a refrigeration or air conditioning system is installed

  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall not be operated below prescribed pressures
  • it shall be approved by the owner for proper operation.
  • a field inspection shall be made before it is put into service

13: R-410A is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • A-2
  • A-1
  • B-1

14: The color code of a tank of ammonia is

  • lavender
  • silver
  • light green
  • white

15: Name three things that must be done when changing refrigeration lubricant?

  • Make sure it's compatible, notify owner, notify AHJ
  • Nothing must be done
  • You can't change lubricants.
  • Place sign, check for leaks, insulate

16: How many gallons of water per pound of ammonia do you need?

  • 1
  • 20
  • 15
  • 5

17: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

18: What is the purpose of a surge capacitor on a contactor?

  • to provide smoother start/stops
  • to protect low voltage equipment
  • to keep the contactor pulled in
  • to balance the sine waves

19: R-22 falls under which safety classification?

  • A-2
  • A-1
  • B-1
  • B-2

20: At higher altitudes, boiling temperatures

  • depends on the refrigerant
  • increase
  • are unaffected
  • decrease

21: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 3.415
  • 34.15
  • 16.64
  • 6.830

22: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

23: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • opening at the pump outlet
  • cooling temperature set-point
  • adjustment of the spring tension of the TXV
  • opening at the pump inlet

24: 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

25: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -40F to 0F
  • -100F to -40F
  • 0F-38F
  • 30F to 50F