DieselShip's Online Content Library

Q1. With Respect to a turbocharged 2-Stoke Main Propulsion Diesel Engine:

a. What is the purpose of Auxiliary Blower.

b. What are the safeties provided for the scavenge air receiver.

c. Why do we require scavenge air cooler?

Q3. a) What are the advantages of thin shell bearings over white metal bearing used in marine diesel engines?

b) How are the thin shells prevented from rotating inside the bearing cage when the engine is running?

c) What is importance of axially locating the thin shell bearing and how it is done?

Q5. With respect to a 2- stroke main propulsion diesel engine starting air system.

a) Explain the starting air overlap?

b) What is the starting air timing for one cylinder?

c) What is slow turning arrangement and what is the purpose?

Q6. With respect to fuel injection system of diesel engines,

a) What is the purpose of VIT?

b) How is the end of injection controlled in a 2 stoke propulsion engine and 4 stroke medium speed auxiliary engine?

c) Explain the purpose of a draw card.

Q7. With reference to a 4-stroke medium speed auxiliary diesel engine,

a) Describe with a simple sketch bottom end bearing assembly.

b) What is the purpose of serrations provided on the piston rod and bearing keep?

c) What special features are provided on the connecting rod bolts?

Q8. With reference to an electro-hydraulic speed governor fitted to an auxiliary diesel engine driving an alternator,

a) With the aid of a simple sketch, explain the speed droop mechanism.

b) What are the differences between the isochronous and droop governors?

Q9. Explain the working principle of a Variable geometry Turbo charger (VGT) and how it differs from a fixed geometry turbocharger. How is the Variable Geometry Turbocharger (VGTs) important for marine engines and how they help maintain the right mix of air and fuel at different engine power levels.