Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

2: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

3: What section governs pressure vessels?

  • Section ASHREA 34
  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • OSHA

4: A self contained system

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

5: What is a Category "D" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems

6: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

7: The critical temperature of a refrigerant gas occurs when

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

8: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

9: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

10: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • doesn't change
  • run as designed with low ambient controls
  • increases

11: Pressure vessels with an internal volume of 3 cubic feet or more

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

12: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

13: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • nearly the same
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference
  • 2F difference

14: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 4%
  • 25%
  • 1%
  • 2%

15: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 660 lbs
  • 330 lbs
  • 500 lbs

16: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would have no effect on the condenser
  • it would cause the condenser to sweat
  • it would make the condenser less efficient
  • it would make the condenser more efficient

17: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

18: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Copper
  • Nickel
  • Zinc
  • Magnesium

19: What type of relief valve is used on a CO2 system?

  • glove disc
  • gate valve
  • fusible plug
  • rupture disc

20: Thermodynamics is the branch of science that deals with

  • state of energy
  • heat energy
  • molecular therory
  • energy due to motion

21: A Low-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

22: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.5
  • 5.5
  • 2.0
  • 3.0

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

  • annually
  • quarterly
  • regularly
  • bi-annually

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

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

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

  • Stop valve
  • Foot valve
  • Moisture indicator
  • Muffler