Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • Stop valve
  • Moisture indicator
  • Foot valve
  • Muffler

2: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the safety valve
  • reset the expansion valve
  • start the fan and circulating pump
  • start the comrpessor

3: R-22 falls under which safety classification?

  • B-2
  • A-1
  • A-2
  • B-1

4: High pressure controls should be set no higher than

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

5: All electrical work done on refrigeration systems must comply with

  • OSHA
  • ASHREA-15 Section 9.2.1
  • NEC and Massachusetts Modifications
  • Department of Energy

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

  • common
  • start
  • run
  • start capacitor

7: A chiller entering and leaving temperature difference is?

  • 50 degrees F
  • 5 degrees F
  • 20 degrees F
  • 10 degrees F

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

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

9: Ammonia (NH3) is a group III refrigerant

  • True
  • False

10: 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 and friction head
  • GPM and unbalanced head and friction head
  • GPM, pipe size, and equivalent head.

11: Start to Run windings will have what resistance?

  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value
  • All will be at equal values
  • The most resistance value

12: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 75%
  • 99%
  • 90%

13: A rule of thumb in air conditioning is ____ CFM per ton?

  • 100
  • 500
  • 400
  • 600

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

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

15: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

16: When must refrigeration system covered by the code be inspected?

  • Annually and when installed
  • Not required
  • Annually
  • Upon installation

17: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

18: Low pressure systems have what kind of compressor?

  • Scroll
  • Rotary
  • Centrifugal
  • Reciprocating

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

  • 18"
  • 24"
  • 12"
  • 36"

20: R-717 is

  • trichloromethane
  • carbon dioxide
  • water
  • ammonia

21: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

22: A professional or office building would be considered what type of occupancy?

  • mercantile
  • business
  • public assembly
  • commercial

23: Gauge pressure is

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

24: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • lower
  • the same
  • there is no Group B1 refrigerants
  • higher

25: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.