4th Class Boiler Test 2

50 Questions | Total Attempts: 468

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Boiler Quizzes & Trivia

Questions and Answers
  • 1. 
    In a recovery boiler:
    • A. 

      Waste heat is recovered from the baking operation

    • B. 

      Black liquor is burned to eliminate lignin

    • C. 

      Smelt is burnt to produce black liquor

    • D. 

      Lime is recovered for re-use

  • 2. 
    The economizer in the steam cycle of an electricity generating plant is located between the:
    • A. 

      Radiant and convection superheaters

    • B. 

      Boiler drum and superheater

    • C. 

      Feedwater pump and the boiler drum

    • D. 

      Superheater and the turbine.

  • 3. 
    The purpose of the absorber in a natural gas plant is to:
    • A. 

      Remove condensates from the gas

    • B. 

      Absorb all the hydro-carbons from the gas

    • C. 

      Scrub the gas from amine

    • D. 

      Remove hydrogen sulphide and carbon dioxide from the gas

  • 4. 
    During an internal boiler inspection an engineer should check:
    • A. 

      That there is a proper air flow through the furnace.

    • B. 

      That all external parts of drums and equipment are positioned properly.

    • C. 

      For scale deposits, corrosion, erosion, cracks, leaks or other defects.

    • D. 

      That the moveable grates and ash system are functioning properly.

  • 5. 
    Raising or lowering of heavy objects using ropes and cables is known as:
    • A. 

      Lifting

    • B. 

      Rigging

    • C. 

      Hoisting

    • D. 

      Elevating

  • 6. 
    Natural ropes are made of:
    • A. 

      Nylon

    • B. 

      Polyethylene

    • C. 

      Dacron

    • D. 

      Manila

  • 7. 
    Prior to commencing boiler cleaning operations it is necessary to: 1. test the boiler water 2. close steam and water valves 3. tag all valves to indicate shut down 4. complete the boiler-room log book 5. check out the burners.
    • A. 

      1 and 3

    • B. 

      2 and 3

    • C. 

      3 and 5

    • D. 

      1 and 5

  • 8. 
    The boiler boiling out procedure:
    • A. 

      Should be done at operating pressure

    • B. 

      Should be done before the dry out procedure

    • C. 

      Should be done at one-half the operating pressure

    • D. 

      Should be done once a year

  • 9. 
    The purpose of boiling out a boiler is:
    • A. 

      To test the material of the boiler

    • B. 

      To find the boiling point of the water in the boiler

    • C. 

      To remove any grease and oil from the heating surface

    • D. 

      To check if there are any leaks

  • 10. 
    The best type of filter for the removal of fine dust, smoke and fumes is the:
    • A. 

      Viscous impingement filter

    • B. 

      Dry filter

    • C. 

      Bag type filter

    • D. 

      Electrostatic filter

  • 11. 
    A Runaround air conditioning heat recovery system consists of two finned tube heat exchangers, the preconditioning coil and the recovery coil. Where is the preconditioning coil of this system usually located?
    • A. 

      On the suction side of the pump

    • B. 

      On the discharge side of the 3-way mixing valve

    • C. 

      In the duct work handling the ventilation into the process

    • D. 

      At the end of the charging unit

  • 12. 
    Three common sensing elements used on humidistat are the: 1. Human hair element 3. Wood element 2. hygroscopic element 4. Metal element.
    • A. 

      1, 2 and 3

    • B. 

      1, 2 and 4

    • C. 

      1, 3 and 4

    • D. 

      2, 3 and 4

  • 13. 
    The three types of compressors most frequently used in refrigeration systems are:
    • A. 

      1, 2 and 3

    • B. 

      1, 3 and 4

    • C. 

      2, 3 and 4

    • D. 

      1, 2 and 4

  • 14. 
    The expansion valve in a refrigeration system is:
    • A. 

      Between the condenser and the receiver

    • B. 

      Between the evaporator and the compressor

    • C. 

      Between the receiver and the evaporator

    • D. 

      Between the compressor and the condenser

  • 15. 
    Safety valves on a refrigeration system:
    • A. 

      Should be fitted on the receiver

    • B. 

      Should be tested by hand lever regularly

    • C. 

      Should be equipped with a leather seat

    • D. 

      Should discharge to sewer

  • 16. 
    In the vapour compression type of refrigeration system, the liquid refrigerant is changed to a gas in the:
    • A. 

      Condenser

    • B. 

      Evaporator

    • C. 

      Receiver

    • D. 

      Compressor

  • 17. 
    In some installations in order to guarantee a supply of clear hot water and prolong the life of a hot water heater the:
    • A. 

      Temperature differential of the temperature control is increased,

    • B. 

      Temperature differential of the temperature control is decreased,

    • C. 

      Operating temperature is raised,

    • D. 

      Inner shell of the heater is lined with cement,

  • 18. 
    One advantage of the electric probe type of low water fuel cut-off is:
    • A. 

      It contains no moving parts or the possibility of mechanical failure is eliminated,

    • B. 

      They operate at a higher water level than the float type,

    • C. 

      That the probes give an indication of the dissolved solids in the boiler water,

    • D. 

      It gives a quicker response to the feedwater regulator,

  • 19. 
    Two element feedwater control:
    • A. 

      Measures water level and steam flow

    • B. 

      Measures water flow and steam flow

    • C. 

      Measures water level and steam level

    • D. 

      Measures oil flow and steam flow

  • 20. 
    Steam is prevented from leaking out around the valve stem of a packless radiator valve with the use of:
    • A. 

      A seat

    • B. 

      A diaphragm

    • C. 

      A spring

    • D. 

      An outside screw

  • 21. 
    The purpose of fins on a convector tube is to:
    • A. 

      Strengthen the tube

    • B. 

      Prevent rupture

    • C. 

      Increase heat transfer

    • D. 

      Accumulate warm air

  • 22. 
    The purpose of a cushion tank is to:
    • A. 

      Store heat while the boiler is firing

    • B. 

      Allow for the expansion of water in the system

    • C. 

      Prevent the system from overflowing

    • D. 

      To prevent the water in the system from freezing

  • 23. 
    The blow down valve of a steam heating boiler must:
    • A. 

      Be installed in series with the safety valve,

    • B. 

      Be installed in the steam space,

    • C. 

      Regulate the feedwater,

    • D. 

      Be installed at the lowest point of the boiler,

  • 24. 
    Your boiler is operated with automatic water feeders. If the boiler suddenly requires an increase in water treatment, what should you look for?
    • A. 

      See if the chemical pump has stopped

    • B. 

      Check for a loss of water

    • C. 

      Check to see if the chemical supplier has sent the wrong chemicals

    • D. 

      Nothing. Simply increase the pump stroke to put more chemicals into the

  • 25. 
    A hot water boiler is protected from over pressure by means of:
    • A. 

      A safety pop valve

    • B. 

      A safety relief valve

    • C. 

      An expansion valve

    • D. 

      An air release valve

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