Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • five
  • three
  • four
  • two

2: How are safety controls wired in a circuit?

  • Either series or parallel
  • Parallel
  • Series/parallel
  • Series

3: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

4: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection
  • shall use fusible plugs
  • shall use pressure relief devices

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

  • Adiabatic
  • Isothermal
  • Pressure-Temperature
  • Volume

6: 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

7: The Department that certifies the transportation of refrigerant is the

  • EPA
  • EPO
  • RSES
  • DOT

8: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • boost voltage
  • run voltage
  • lift voltage
  • pick-up voltage

9: Which of the following is an example of an azeotropic refrigerant?

  • R-410A
  • R-134A
  • R-500
  • R-404A

10: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

11: An oil pressure safety switch should be set at

  • 5 to 10 psi below low side pressure
  • 10-15 psi above low side pressure
  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure

12: What pipe can not be used for refrigeration?

  • N
  • M
  • K
  • L

13: 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

14: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

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

16: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • There isn't enough information to answer.
  • 1250
  • 2

17: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Rotating vanes
  • Fan-like action
  • Suction and discharge valves
  • Nesting scrolls

18: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 100%
  • 90%
  • 80%

19: When a refrigeration or air conditioning system is installed

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

20: What must be done to refrigerant pipes before being buried?

  • Leaked checked
  • Encased
  • Certified
  • Coated

21: Electricity involves the movement of electrons in atoms

  • True
  • False

22: Low temperature systems should have what?

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

23: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • institutional occupancy
  • commercial occupancy
  • public assembly occupancy
  • illegal occupancy

24: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line

25: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • too small evaporator
  • starved evaporator
  • compressor suction valve stuck open
  • overcharged