Metal Bearing and Turbo-charger Surging Quiz
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Questions and Answers

What is the purpose of keeping the air supply to the air spring open after finishing work on exhaust valves?

  • Prevent carbon deposit from falling between the seat and valve (correct)
  • Prevent exhaust valve from cooling down
  • Prevent the oil flowing on the air side when main lub oil pump is running
  • Keep it always on standby
  • What is the main cause of turbo-charger surging?

  • Too high turbo-charger rpm
  • Sudden increase and decrease of turbo-charger rpm due to pitching (correct)
  • Too low T/C rpm without auxiliary blower running
  • Ship in rolling condition
  • Where does the cylinder lubricator supply oil in the engine?

  • Cylinder block
  • Cylinder head
  • Cylinder liner (correct)
  • Piston
  • When is grit dry cleaning of the M.E. turbo-charger turbine side typically performed?

    <p>Running at full ahead</p> Signup and view all the answers

    In a two-stroke engine, when the piston is at bottom dead center and moving upwards until TDC, what cycle is achieved?

    <p>Intake (partially an exhaust) and compression stroke</p> Signup and view all the answers

    Which part of the engine is primarily responsible for cooling the combustion chamber?

    <p>Cylinder head</p> Signup and view all the answers

    What is the purpose of stopping the engine when not in use?

    <p>To prevent built-up of moisture in scavenging air</p> Signup and view all the answers

    Why does increasing scavenging air box temperature above dew point important?

    <p>To keep scavenging air temperature in the 45 to 50 deg C range</p> Signup and view all the answers

    In a two-stroke engine without an exhaust valve, what are the lowest holes in the cylinder liner called?

    <p>Cylinder lubricating holes</p> Signup and view all the answers

    How is a turbocharger usually powered in an engine?

    <p>By engine exhaust gas</p> Signup and view all the answers

    What is usually found in large bored engines?

    <p>Piston rod and crosshead</p> Signup and view all the answers

    When receiving 500 metric tons of HFO with a specific gravity (SG) at 55 deg C, how many cubic meters should be received based on a specified SG at 15 deg C?

    <p>520.18 cub-mtr</p> Signup and view all the answers

    What is the purpose of the emergency air compressor onboard?

    <p>To start auxiliary engines</p> Signup and view all the answers

    What type of bearing is commonly used for the main engine main journal and big-end bearing due to its ability to support high weight/load without much wear?

    <p>Plain-white metal bearings</p> Signup and view all the answers

    When water washing the M.E. turbo-charger turbine side, at what reduced engine speed should you operate at?

    <p>1500 rpm</p> Signup and view all the answers

    What part of the diesel generator is impacted when adjusting the injection timing of the fuel injection pump?

    <p>Pressure maximum</p> Signup and view all the answers

    What is the observed specific gravity of fuel if the specific gravity at 15°C is 0.8891 and the observed temperature is 40°C?

    <p>0.8704</p> Signup and view all the answers

    What is the steel structural element in a slow-speed two-stroke engine that carries the crosshead guides and supports the engine block?

    <p>A-frame</p> Signup and view all the answers

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