Metal Bearing and Turbo-charger Surging Quiz

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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?

Running at full ahead 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?

Intake (partially an exhaust) and compression stroke Signup and view all the answers

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

Cylinder head Signup and view all the answers

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

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

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

To keep scavenging air temperature in the 45 to 50 deg C range 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?

Cylinder lubricating holes Signup and view all the answers

How is a turbocharger usually powered in an engine?

By engine exhaust gas Signup and view all the answers

What is usually found in large bored engines?

Piston rod and crosshead 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?

520.18 cub-mtr Signup and view all the answers

What is the purpose of the emergency air compressor onboard?

To start auxiliary engines 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?

Plain-white metal bearings 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?

1500 rpm Signup and view all the answers

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

Pressure maximum 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?

0.8704 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?

A-frame Signup and view all the answers