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Mechanical One (+engine Safety) > Diesel engines revision Questions > Flashcards

Diesel engines revision Questions Flashcards

1
Q

What are the applications for a diesel engine on board

A
  • air compressors
  • fire pumps
  • diesel generator
  • main prpoilsion engines and motors
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2
Q

Explain how cylinders are numbered on an ‘inline’ engine

A

Cylinders are numbered from ‘free end’ starting with 1,2,3 ect to ‘drive end’

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3
Q

Explain how cylinders are numbered on an ‘vee’ engine

A

Vee engines, A&B banks can be identified by looking from ‘free end’

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4
Q

What is the purpose of a crankshaft

A

To turn reciprocating motion into rotary motion

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5
Q

What is the purpose of the flywheel

A

To promote ‘smooth running ‘ during the non-power strokes by storing kinetic energy

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6
Q

What is the purpose of the camshaft

A

To control the opening and closing of the correct sequence and is driven off the crankshaft .
At half the crank shaft speed

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7
Q

What is the purpose of the pushrod

A

To transfer motion from the camshaft to the rocker arms

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8
Q

What are four strokes cylcle

A

Induction stroke
Compression stroke
Power stroke
Exhaust stroke

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9
Q

What is the purpose of the fuel lift pump

A

To provide clean, ready to use fuel from the header tank to the diesel engine

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10
Q

What is the purpose of the oil cooler within a lub oil system and what medium does it use to achieve

A

The purpose of a oil cooler is to use cooling system so its vicosity in the lub oil is kept cool to a sorten temputre

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11
Q

The kittewake oil tester is testing the oil for what in the oil (four tests)

A

Water in oil
Insolubles
Viscosity
TBN acicity

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12
Q

How often is oil testing performed and where are the results stored

A

Weekly and in the engine log book

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13
Q

What makes up coolant? And to what ratio

A

Its a 50/50 mix of water and AL39

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14
Q

What are the 5 engine safty devices used to protect the engine

A

Low lub oil presure

Low coolant pressure

High lub oil temputer

High coolent temputer

Engine over speed

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15
Q

Who do you inform when any of the engine safty devices alarms trip

A

You should inform the MEOOW immediatly

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16
Q

what are the hazards when working with/around engines

A

Fire

Heat

Noise

Rotating machinery

Personal hygenie

17
Q

what do you do for re-settinga trip/alarm

A

Investigate the cause of the trip

Rectify the fault

Rest the trip

18
Q

What is the purpose of the fuel injector within a diesel engine

A

Fuel injector measured amount of high pressure, atomised fuel into the combustion chamber

19
Q

What is a diesel engine

A

A diesel engine is a type of engine that compresses air into the cylinder and the injects furl into the hot compressed air and spontanous combustio occurs

20
Q

What are the valves doing on a induction stroke on a diesel engine

A

The inlet valvues opens allowing fresh air into the cyclinder while at the same time the exhaust is closed

21
Q

What are the piston movments on a

induction stroke

A

The piston moves from top dead centre (TBC) to bottom dead centre (BDC)

22
Q

What causes the vaccum in a induction stroke

A

The increase in volume which causes depression, drawing air into the cylinder

23
Q

What is the valve movement on a compression stroke

A

The inlet & exhaust valves are both closed

24
Q

What is the piston movement in a compression stroke

A

The piston moves from bottome dead centre (BDC) to top dead centre (TDC)

Which compressing the air . As it becomes trapped in the cylinder the temputure and pressure rises

25
Q

What does the fuel injector do when the piston is almost at TDC

A

The fuel injector sprays high pressure atomised fuel

26
Q

When does the fuel injecter spray its high pressure , atomised fuel

A

When the piston is almost at top dead centre (TDC )

27
Q

What happens when the fuel is injected into the high pressurised air on a compression stroke

A

It creates a ignition delay of the fuel igniting

28
Q

What are the valves movements on a power stroke

A

Both valves remain closed

(same as compression stroke)

29
Q

What is the piston movement on a power stroke and explain what else is happing at the same time on this stroke

A

The piston is passing TDC and starts to decend towards BDC

While the fuel has been ignited and combustion occurs

30
Q

What causes the down push of the piston to BDC

A

It is the burning of air/fuel mix which causes a rapid increase of temputre and pressure and thta is what causes the mownt of the piston

31
Q

What are the valves movement on a exhaust stroke

A

The exhaust valve are open

The inlet valve is closed

32
Q

What is the piston movement on a exhaust stroke and what does the movement do

A

The piston rises from BDC to TDC

Which in turn pushes the waste gases through the exhaust

Mechanical One (+engine Safety) (3 decks)

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