Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: A micron is

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

3: A single pole-double throw switch used how many wires excluding the ground wire?

  • three
  • five
  • two
  • four

4: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

5: Ammonia vaporization takes place at what temperature?

  • -110F
  • -460F
  • -32F
  • -28F

6: The main purpose of the accumulator is to

  • prevent liquid slugs at the compressor
  • store liquid refrigerant
  • provide space for the accumulation of oil and containminants
  • provide space for vapor to accumulate

7: What is used to check very low air pressures in air conditioning duct?

  • Barometer
  • Vacuum gauge
  • Manometer
  • Anemomter

8: A declaration test is needed when the system contains more than

  • 120 lbs
  • 55 lbs
  • 110 lbs
  • 65 lbs

9: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

10: Low pressure systems have what kind of compressor?

  • Reciprocating
  • Rotary
  • Scroll
  • Centrifugal

11: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

12: R-22 is considered a(n)

  • HFC
  • HCFC
  • HCFCH
  • CFC

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

  • salt
  • sugar
  • sand
  • soil

14: A motor starter contains a thermal overload and a

  • contactor
  • solenoid
  • transformer
  • 3-way relay

15: High pressure controls should be set no higher than

  • 10% of set point
  • 90% of set point
  • 25% of set point
  • 80% of set point

16: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

17: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

18: How much clearance do you need around the perimeter of electrical panels?

  • 12"
  • 18"
  • 36"
  • 24"

19: What is potential measured in?

  • Volts
  • Henrys
  • Amps
  • Ohms

20: Ammonia (NH3) is a group III refrigerant

  • True
  • False

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

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

22: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

23: Sublimation occurs when

  • gas is formed directly from a solid
  • gas is formed from a liquid
  • ice melts and turns to water
  • liquid is formed from a gas

24: The density of a gas refers to

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

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

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