Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure is equivalent of

  • Force
  • Area X Force
  • Force X Area
  • Force / Area

2: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Muffler
  • Foot valve
  • Stop valve
  • Moisture indicator

3: What section of ASHRAE-15 governs pressure vessels?

  • Section 7 ASHRAE-15 ASME VIII fired
  • Section 9 ASHRAE-15 ASME VIII unfired
  • OSHA
  • Section 6 ASHRAE-34 ASME VIII unfired

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

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

5: What refrigerant were phased out in 2004?

  • R-11
  • R-12
  • R-134a
  • R-22

6: A micron is

  • one thousandths of a millimeter
  • one millonths of a micrometer
  • a larger unit of measurement than Hg
  • one millonths of a centimeter

7: E = I X R is

  • Amps Law
  • Impedance Law
  • Ohms Law
  • Watts Law

8: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • outlet of low temperature evaporator
  • outlet of the liquid line
  • inlet of the low temperature evaporator.

9: On a TXV, the purpose of an external equalizer is to?

  • Increase the pressure on the top of the power head diaphragm
  • compensate for a pressure drop across the evaporator coil
  • allow a greater adjustment spam
  • balance the evaporator load

10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 330 lbs
  • 55 lbs
  • 660 lbs
  • 500 lbs

11: Give an example of a secondary coolant?

  • R-718
  • R-12
  • R-410A
  • R-717

12: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

13: On a centrifugal compressor, stationary diffuser vanes are needed to

  • increase the clearance space
  • prevent high pressure on the packing
  • convert velocity energy to pressure
  • stop gas flow

14: What measures gas pressure?

  • Manometer
  • Hydrometer
  • Barometer
  • Hygrometer

15: A relief valve discharge capacity is rated in

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

16: Gauge pressure is

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

17: R-123 belongs to Group

  • B-2
  • B-3
  • A-3
  • B-1

18: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

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

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

20: A high side float is a

  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type valve that controls the crankcase oil level
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high

21: The External equalizer of a TXV compensates for

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

22: Low-side system leaks in a low-pressure chiller will often result in

  • nitrogen leaking out of the system.
  • air being pulled into the system
  • system refrigerant leaking from the system
  • water being pulled into the system

23: Booster compressors connect to the ____ side of the compressor

  • vapor
  • liquid
  • oil side
  • low side

24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • .9776 watts
  • 977.6 watts
  • 9.776 watts
  • 9,776 watts

25: Single compound Refrigerants are classified by what two criteria?

  • Temperature range and hazardousness
  • Flammability and toxicity
  • Flammability and temperature range
  • Weight and color