ENGINE ROOM MACHINERY AND ENGINE

 ENGINE ROOM MACHINERY AND ENGINE

Q1. What are the duties of engine room ratings?

Ans:

1.      Cleaning of the engine room

2.      Monitoring engine parameters

3.      Assist the senior engineer for maintenance

4.      Check the sounding of oil/ water level tanks.

5.      Drain the settling & service tank for any water.

 

Q2. Identify the components of a diesel engine. State the function of the components.

Q3. What is the use of auxiliary engine on board and state which type of engine is use as auxiliary engine.

Ans: four stroke engine use as a auxiliary engine which is use to produce the electricity on board ship.

 

Q4. State at least ten major machinery items you will find in the engine room?

Ans: Main engine, Auxiliary engine (generator), auxiliary boiler, Purifier, Air compressor, Pumps, Incinerator, Oily water separator (OWS), Air conditioning plant, Refrigeration plant.

Q5. Name major components of the diesel engine.

Ans: Piston, Cylinder liner, Cylinder head, Connecting rod, Bottom end bearing, Main bearing, Crank shaft, Cam shaft etc.

 

Q6. What makes the propeller rotates?

Ans: propeller is connected with the main engine by tail shaft intermediate shaft and thrust shaft. As main engine rotates propeller will also rotates.

 

Q7. What is the difference between fuel oil used on ships and that diesel oil used in cars and trucks?

Ans: The fuel oil used in diesel engine is either HFO or marine diesel oil (MDO). the cars and trucks are running on LDO (light diesel oil) or petrol.

 

Q8. What is the function of turbocharger on a diesel engine?

Ans: Turbocharger is used to increase the intake air supply in to the cylinder with increasing the pressure and density of the air. It running by engine exhaust gas. And also it cleans the exhaust gas before leaving to atmosphere

 

Q9. What is used to start the diesel engine onboard ship?

Ans: Diesel engine is start by the compressed air which is known as starting air.

Q10. What is the use of fuel injector in diesel engine?

Ans: fuel injector is used to inject the fuel in combustion chamber at the right time and right quantity in atomizing form.

 

Q11. What are the mountings of cylinder head contain?

Ans:

i)        Cylinder head relief valve

ii)      Air starting valve

iii)    Fuel injector

iv)    Indicator cock

v)      Inlet and exhaust valve (4 stroke engines)

 

Q12. What is the purpose of flywheel in diesel engine?

Ans: flywheel is used to store the energy during the power stroke and release the same energy during remaining stroke.

 

Q13. What is stroke?

Ans: The distance travelled by the piston from TDC to BDC or vice versa, is known as stroke.

 

Q14. What are the safety devices are fitted on diesel engine?

Ans:

1)      Crank case relief valve/ relief door

2)      Cylinder head relief valve

3)      Oil mist detector

4)      Turning gear

5)      Over speed trip

6)      Different alarms and trips

Q15.What is the use of Crankcase relief door?

Ans: It is use to release the excess pressure from crankcase. It lift more than 0.5 bar working pressure inside the crankcase.

Q16. What is the use of stuffing box in 2 stroke diesel engine?

Ans: it us use to separate the crankcase space from scavenge space. Also it seals the piston rod which prevents the hot gases leak into crank case.

Q17. What is scavenging?

Ans: It is the process of supply the fresh charged air into cylinder and remove the exhaust gas with the help of fresh air.

Q18. What is tappet clearance? How to take it?

Ans: The clearance between valve stem and rocker arm is known as tappet clearance. The clearance should be for inlet valve is 0.35 mm. (depends on manufactures)

The clearance should be for exhaust valve 0.45 mm (depends on manufactures)

For taking the tappet clearance we used filler gauge. While taking the clearance make sure piston should be at TDC.

 

 

VALVES

 

 

Q1. Identify different types of valves. (Workshop)

 

Q2. What do you understand by non-return valve?

Ans: The Non-Return valve gives on way flow.

 

Q3. What will happen if valve is not closing properly?

Ans: Flow will not stop

 

Q4. State the importance of valve maintenance?

Ans: all valve should be operate easily.

 

Q5. State precaution to be taken during valve maintenance.

Ans:

1)      Pipe line should be depressurized first.

2)      New gasket and gland packing should be used.

3)      Put notice from where system is started.

 

Q6. What will you do on finding leaky gland on a valve?

Ans: Both nut of the gland are to be tightened equally to stop leakage. If leakage is not stopped renew the gland packing.

 

Q7. What are the different types of valves used on board ship?

Ans: Globe valve, Butterfly valve, Gate valve, Angle valve, Ball type valve, Swing check valve, Safety valve, Relief valve, Quick closing valve, Pressure reducing valve.

Q8. What is the use of check valve?

Ans: Check valve is used to prevent the back flow of liquid.

 

 

 

Q9. What is the use of Quick closing valve?

Ans: QCV is fitted on fuel oil and lube oil tanks. It is operated from outside the engine room from remote location in case of emergency.

 

Q10. Why maintenance you will carry out on Globe valve SDNR type.

ANS: normally we are looking for the smooth operation of the valve so the following maintenance will carry out.

1)      Renew the gasket

2)      Renew the gland packing

3)      Carry out lapping

 

Q11. Which type of valve is used in bilge line?

Ans: Screw down non return valve

 

Q12. Which type of valve is used in ballast system?

ANS: Butter fly valve and gate valve

 

Q13. What is the purpose of pressure reducing valve.

Ans: It is used to reduce the pressure from high to low by setting the spring tension.

 

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