Exam Question
(a) Explain the types of turbocharging in a marine diesel engine. (8)
(b) What are the reasons that may induce vibration on a main engine crankshaft? (8)
Class 4 (4th Engineer)
MEKM
📅 Oct 2025
Reference Answer
### (a) Explanation of Types of Turbocharging in a Marine Diesel Engine
Turbocharging is a crucial technology in modern marine diesel engines, significantly enhancing power output, fuel efficiency, and reducing emissions by increasing the mass of air supplied to the cylinders. This is achieved by utilizing the energy of the exhaust gases to drive a turbine, which in turn drives a compressor.
There are several primary types of turbocharging systems employed in marine diesel engines, each with distinct operating principles, advantages, and disadvantages:
#### 1. Constant Pressure Turbocharging
Turbocharging is a crucial technology in modern marine diesel engines, significantly enhancing power output, fuel efficiency, and reducing emissions by increasing the mass of air supplied to the cylinders. This is achieved by utilizing the energy of the exhaust gases to drive a turbine, which in turn drives a compressor.
There are several primary types of turbocharging systems employed in marine diesel engines, each with distinct operating principles, advantages, and disadvantages:
#### 1. Constant Pressure Turbocharging
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