Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • Not more than 3' above grade
  • At least 20' above grade
  • At least 15' above grade

2: Transformers are rated in

  • volts
  • volt-amps
  • amps
  • volts-ohms

3: In a motor, an internal overload might open if

  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an open start winding
  • there's a direct short

4: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • 1.2
  • .8
  • 1.7
  • .1

5: The oil separator is always inserted in the system

  • where it can be easily serviced
  • in a cool spot
  • to prevent oil logging
  • in the discharge line

6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-11
  • R-12
  • R-22

7: A VRF system is a direct system

  • true
  • false

8: Secondary refrigerants are usually

  • alcohol
  • water or brine
  • expensive
  • Prestone anti-freeze

9: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • quarterly
  • bi-annually
  • regularly

10: What are the three components of a transformer?

  • Primary core, secondary coil, and high and low voltage connectors.
  • Primary coil, secondary coil, and core
  • Primary coil, secondary coil, and copper contacts
  • Contacts, secondary coil, and core

11: One atmosphere equals

  • 29.4
  • 0 psia
  • 0 psig
  • 14.7

12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • weak solution
  • absorbed solution
  • concentrated solution
  • strong solution

13: _____ and its alloys are suitable for use with ammonia systems.

  • Zinc
  • Aluminum
  • Copper
  • Magnesium

14: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

15: The high side float assembly meters refrigerant into the evaporator through the

  • upper chamber of the low side
  • lower chamber of the low side
  • lower chamber of the high side
  • upper chamber of the high side

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

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

17: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 14 AWG
  • 12 AWG

18: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

19: How many gallons of water do you need per pound of ammonia?

  • 50
  • 100
  • 10
  • 1

20: R-22 falls under which safety classification?

  • B-2
  • A-2
  • A-1
  • B-1

21: 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

22: Sensible heat is the heat added to a substance to

  • change its state
  • raise its temperature
  • cause evaporation
  • freeze it

23: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

24: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

25: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 50.2 psig
  • 66.1 psig
  • 70.8 psig
  • 43.3 psig