Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

2: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Anyone, it's a completely safe area
  • Any employee
  • Authorized persons only

3: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • R-414B
  • Cascade
  • Low pressure
  • Simple

4: Halo-carbon refrigerants cannot be used with what material?

  • Copper
  • Magnesium alloy
  • Aluminum
  • Stainless Steel

5: Increasing superheat will do what to your system?

  • Increase gas flow
  • Nothing
  • Decrease liquid flow
  • Increase liquid flow

6: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 330
  • 1,000
  • 6.6
  • 110

7: On a pumpdown system, the liquid-line solenoid is controlled by the

  • defrost timer
  • low-ambient controller
  • low pressure switch
  • thermostat

8: A split-phase motor has a ______ winding and a ____ winding

  • run, common
  • duel-run, duel-start
  • start, common
  • run, start

9: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

10: The best way to detect ammonia in brine is

  • CO2 gas
  • carbonation of soda
  • nessler regaent
  • potassium of line

11: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 200
  • 720,000
  • 12,000

12: 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

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

  • 75%
  • 80%
  • 90%
  • 100%

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

  • commercial
  • mercantile
  • business
  • public assembly

15: Volts x amps equals

  • Watts
  • Impedance
  • Inductance
  • Ohms Law

16: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the high side
  • the low side
  • the aggregate of the high side and low side
  • 2.5 times the design pressure

17: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

18: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 6.830
  • 3.415
  • 16.64
  • 34.15

19: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
  • a fusible plug
  • either a fusible plug or a pressure relief device
  • a pressure relief device

20: The proper location for an oil separator is between the

  • receiver and metering device
  • compressor and condenser
  • condenser and receiver
  • evaporator and compressor

21: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusible plug
  • relief plug
  • rupture plug
  • fusion plug

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

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

23: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-1
  • B-2
  • A-2

24: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 88
  • 38
  • 58
  • 96

25: What is the minimum height refrigeration piping should be placed against walls?

  • 6'
  • 72"
  • 7.25'
  • Ceiling height