Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

2: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

3: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

4: Which creates more of a heat load?

  • 70% RH
  • 50% RH
  • 90% RH
  • 30% RH

5: How are refrigerant blends classified?

  • Based on worst case fractionation
  • Blends don't have to be classified
  • Based on the oil used
  • Based on best case Fractionation

6: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Dry bulb temperature
  • Wet bulb temperature
  • Critical temperature
  • Saturated temperature

7: What pipe can not be used for refrigeration?

  • N
  • K
  • M
  • L

8: A direct system

  • is a self-contained complete factory made and tested system
  • is one which encloses a separate body of evaporative refrigerant
  • is on where brine is cooled & circulated to the space refrigerated
  • is where the refrigerant comes in contact with the space refrigerated

9: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 36
  • 18
  • 24

10: In an electrical circuit, what is potential measured in?

  • Ohms
  • Amps
  • Herys
  • Volts

11: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

12: An example of an "Expendable Refrigerant" is

  • liquid nitrogen
  • ammonia
  • lithium bromide
  • liquid oxygen

13: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • mercantile occupancy
  • commercial occupancy
  • business occupancy
  • public assembly occupancy.

14: A run capacitor is wired in series with the _____ windings.

  • run
  • start
  • common
  • start capacitor

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

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

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

  • True
  • False

17: Which of the following is not an air velocity meter?

  • Anemometer
  • Hydrometer
  • Anemotherm
  • Velometer

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

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

19: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's water
  • Because it's a non-flammable refrigerant
  • Because it's cheap

20: Suction line oil traps should be installed when the condenser is

  • more than 100' away from the evaporator
  • on the third floor roof and the evaporator is in the basement
  • located outside the operates in temperatures below 35F
  • in the basement and the evaporator is on the third floor

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

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

22: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • printed circuit board (PCB)
  • motor starter
  • duel-voltage switch

23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • phosgene gas sening
  • CO Sensing
  • refrigerant sensing
  • A group sensing

24: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-134A
  • R-123
  • R-22

25: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above