Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A split-phase motor has a ______ winding and a ____ winding

  • run, start
  • run, common
  • start, common
  • duel-run, duel-start

2: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or more
  • vessels of 10 cubic feet or less

3: Which winding have the most turns?

  • they have equal amount of turns
  • depends on the motor phase
  • run
  • Start

4: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • A-1
  • A-2
  • B-1

5: 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

6: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • specific heat
  • sensible heat
  • lost heat
  • latent heat

7: A self contained system

  • is a unit system Group II refrigerants only
  • is a unit system Group I refrigerants only
  • is a complete factory made and tested system
  • is any system or part of a system used to increase evaporation by expansion or vaporization

8: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

9: The best way to detect ammonia in brine is

  • carbonation of soda
  • potassium of line
  • CO2 gas
  • nessler regaent

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

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

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

  • 15%
  • 10%
  • 20%
  • 5%

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

  • Foot valve
  • Muffler
  • Moisture indicator
  • Stop valve

13: Cooling tower lowers condenser water temp by

  • running water thru a secondary heat exchanger
  • running fans at 100%
  • condensation
  • evaporative cooling

14: 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
  • increased capacity
  • low suction pressure

15: Mercury was used in thermometers primarily because it

  • never freezes
  • expands uniformly
  • vaporizes at very high temperatures
  • was inexpensive

16: A hissing noise at the expansion valve is a good indication that

  • expansion valve is oversized
  • gas is passing thru it
  • nothing is passing thru
  • liquid is passing thru it

17: The actual expansion curve of compressor follows most nearly which one of the following

  • Adiabatic
  • Isothermal
  • Pressure-Temperature
  • Volume

18: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

19: When energized, a normally open relay will be

  • depends on the type and class of the relay
  • open
  • noisy
  • closed

20: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Magnesium
  • Nickel
  • Zinc
  • Copper

21: "I" represents ____ in the Ohm's law formula.

  • capacitance
  • amperage
  • resistance
  • voltage.

22: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM, pipe size, and equivalent head.
  • GPM and unbalanced head and friction head
  • GPM and friction head

23: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 12,000
  • 200
  • 720,000

24: An air conditioning system rated for 36,000 BTU's is equivalent to

  • one ton of cooling
  • 12,000 tons of cooling
  • two tons of cooling
  • three tons of cooling

25: When a refrigeration or air conditioning system is installed

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