Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: one BTU equals

  • 3.41 hp
  • Pi
  • 12,000 hp
  • 31.4 hp

2: The best way to detect ammonia in brine is

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

3: The freezing point of water at sea level is?

  • -10C
  • 32F
  • 32C
  • 0F

4: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UL and UM
  • UV or UR
  • UM or UL

5: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • mixed occupancy
  • commercial occupancy
  • institutional occupancy
  • public assembly occupancy

6: Ohm's Law indicates Amps X Resistance = ___________.

  • Ohms
  • Impedance
  • Volts
  • Current

7: How many closing forces operate a thermostatic expansion valve?

  • 3
  • 2
  • 4
  • 1

8: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

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

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

10: The critical temperature of a refrigerant gas occurs when

  • the gas is no longer saturated
  • the gas returns to a liquid
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation

11: A self contained system

  • is a complete factory made and tested system
  • is a unit system Group I refrigerants only
  • is a unit system Group II refrigerants only
  • is any system or part of a system used to increase evaporation by expansion or vaporization

12: Which is the lowest vacuum?

  • 1,000 Microns
  • 5 psig
  • 10 psia
  • 5" hg

13: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?

  • T&P device
  • Circuit Breaker
  • Temperature limiter device
  • Relief valve

14: Mercury was used in thermometers primarily because it

  • never freezes
  • expands uniformly
  • vaporizes at very high temperatures
  • was inexpensive

15: When should a relief valve start to function?

  • Before the purge station discharges
  • At it's set pressure
  • 10 psi before it's set pressure
  • Two times it's working pressure

16: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 255 psig
  • 365 psig
  • 327 psig
  • 125 psig

17: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • low voltage t-stat
  • line voltage t-stat
  • immersion controller
  • aquastat

18: 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

19: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation
  • the gas returns to a liquid
  • the gas is no longer saturated

20: Pi equals approximately

  • 746
  • 3.41
  • 12,000
  • 3.14

21: How many flammability classifications are refrigerants in?

  • 3
  • 7
  • 2
  • 5

22: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 20 amps
  • 24 amps
  • 10 amps
  • There isn't enough information to answer.

23: A motor starter contains a thermal overload and a

  • contactor
  • transformer
  • 3-way relay
  • solenoid

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

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

25: Which occupancy can ammonia be used in?

  • depends on the quantity of freon
  • industrial
  • redifential
  • commercial