Maryland Engineer 3rd Class Test

83 Questions | Total Attempts: 26

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Maryland Engineer 3rd Class Test


Questions and Answers
  • 1. 
    The warm air distribution system that is usually located along the center line of the building is the:
    • A. 

      Balanced supply/return

    • B. 

      Extended plenum

    • C. 

      Perimeter loop

    • D. 

      Perimeter radial

  • 2. 
    (Fill in the Blank) Seamus needs to check the steam system at the point where the pressure is the highest. He should check _____ where the heat is ___?
    • A. 

      Boiler; added

    • B. 

      Boiler; removed

    • C. 

      Radiator; added

    • D. 

      Radiator; removed

  • 3. 
    Latent heat of fusion is the amount of heat required for a substance to change from a  ____
    • A. 

      Gas to a liquid

    • B. 

      Liquid to a gas

    • C. 

      Solid to a gas

    • D. 

      Solid to a liquid

  • 4. 
    One of the largest potential energy wasters in a steam distribution system is:
    • A. 

      Leaking steam traps

    • B. 

      Faulty throttling valves

    • C. 

      Air in the system

    • D. 

      Uninsulated condensate lines

  • 5. 
    You have been told that the cost of heating oil is increasing by 4%. If the current cost of oil is $1.04, the new price will be:
    • A. 

      $1.43

    • B. 

      $1.16

    • C. 

      1.08

    • D. 

      1.04

  • 6. 
    Boiler furnace explosions are likely to occur for all of the following reasons except?
    • A. 

      A weak pilot flame

    • B. 

      Low fuel pressure

    • C. 

      Insufficient combustion air

    • D. 

      Insufficient purge of the furnace before startup

  • 7. 
    All of the following boiler fitting are required on hot water heating boilers except?
    • A. 

      A pressure or altitude gauge

    • B. 

      A safety relief valve

    • C. 

      A shut-off valve

    • D. 

      A water gauge glass and column

  • 8. 
    CBS company burns hydrocarbons to generate electricity for its operations. What are the two most common byproducts of hydrocarbon combustion?
    • A. 

      Carbon monoxide and sulfer

    • B. 

      Carbon monoxide and water

    • C. 

      Carbon dioxide and sulfur

    • D. 

      Carbon dioxide and water

  • 9. 
    All of the following could cause a VAV-belt to fray, crack, or wear except?
    • A. 

      Loose belt tension

    • B. 

      Incorrect pulley sizes

    • C. 

      Pulleys out of alignment

    • D. 

      Shafts not parallel

  • 10. 
    In all steam heating systems, the vertical steam supply pipes are called?
    • A. 

      Riser

    • B. 

      Returns

    • C. 

      Upfeeds

    • D. 

      Wet lines

  • 11. 
    If a pump sounds like it is pumping gravel, the most likely problem is?
    • A. 

      Lack of balance

    • B. 

      Worn bearings

    • C. 

      Loose couplings

    • D. 

      Cavitation

  • 12. 
    A thermocouple used to detect the presence of a gas flame consists of?
    • A. 

      An infrared ray-emitting device

    • B. 

      A rod extending into the flame

    • C. 

      An ultraviolet ray-emitting device

    • D. 

      Two wires of dissimilar metal welded together

  • 13. 
    The lowest temperature at which condensation can be prevented in the flu gas passages of a hot water heating boiler is 
    • A. 

      170°

    • B. 

      190°

    • C. 

      210°

    • D. 

      130°

  • 14. 
    The device that ensures that steam pressure will not force the boiler water back into the return line is a?
    • A. 

      Condensate trap

    • B. 

      Direct feed pump

    • C. 

      Hartford loop

    • D. 

      Pressure regulator

  • 15. 
    Two types of electric boilers are the electrode and the?
    • A. 

      Immersion

    • B. 

      Modified Scotch

    • C. 

      Steel plate

    • D. 

      Tubular

  • 16. 
    A packing-type seal is designed to leak a small amount of liquid through the packing to?
    • A. 

      Lubricate and cool the packing

    • B. 

      Relieve system pressure

    • C. 

      Check temperature of fluids

    • D. 

      Keep air out of the system

  • 17. 
    The directions on a bottle of cleaning fluid call for an 8:1 ration of water to full-strength fluid. How many gallons of ready-to-use solution will one quart of full-strength fluid yield? (1 gallon = 4 quarts)
    • A. 

      2.0 gal

    • B. 

      2.25 gal

    • C. 

      8.25 gal

    • D. 

      9.0 gal

  • 18. 
    The greatest benefit of the dry method of laying up a boiler is it?
    • A. 

      Prevents freezing

    • B. 

      Minimizes corrosion

    • C. 

      Minimizes oxidation

    • D. 

      Eliminates off-season leaking

  • 19. 
    The control used on gas and oil fired heating boilers to provide for proper sequencing of the combustion controls during the startup and shutdown is the?
    • A. 

      Limit control

    • B. 

      Capacity control

    • C. 

      Programming control

    • D. 

      Safety control

  • 20. 
    A volute is part of a?
    • A. 

      Centrifugal pump

    • B. 

      Gear pump

    • C. 

      Hose pump

    • D. 

      Plunger pump

  • 21. 
    Some steam heating systems operate under a vacuum in order to?
    • A. 

      Prevent steam leaks

    • B. 

      Use steam with a temperature above 212°f

    • C. 

      Use steam with a temperature below 212°f

    • D. 

      Prevent air from entering the steam heating system

  • 22. 
    The amount of heat necessary to convert 100 lbs of ice at 32°f to water at 132°f is 
    • A. 

      10,000 BTU

    • B. 

      24,400 BTU

    • C. 

      14,400 BTU

    • D. 

      10,050 BTU

  • 23. 
    The boiler operator should watch at all times for all of the following except?
    • A. 

      Leaks in steam, water, and fuel connections

    • B. 

      Proper fuel air ratio

    • C. 

      Operating pressure and temperatures

    • D. 

      Incoming water quality

  • 24. 
    One advantage of hydronic heating over steam heating is?
    • A. 

      Condensate returns are smaller

    • B. 

      Less building damage may result from a leak

    • C. 

      Piping pitch or slope is not as critical

    • D. 

      Pressure and temperature are easily controlled

  • 25. 
    When steam or hot water is used as the heat source in a secondary warm air heating system, the system may be classified as a?
    • A. 

      Direct-fired boiler

    • B. 

      Fin-coil heat exchanger

    • C. 

      Vertical forced air

    • D. 

      Low-boy air

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