Class 2 (2nd Engineer) MEP 📅 Feb 2021

Exam Question

Using sketches explain the difference between pulse and Constant Pressure turbocharger systems.

(a) In the event of one of the Pulse turbocharger's becoming inoperative due to mechanical breakdown explain the modifications required to allow the engine to operate safely.

(b) State the instruction you as second Engineer would issue regarding the additional engine monitoring requirements following the steps taken in (a).

Reference Answer

(a) Difference between pulse and Constant Pressure turbocharger systems.
In the constant-pressure turbocharging system, each cylinder's exhaust gases are directed to a common exhaust gas manifold. From the manifold, the exhaust gases are channeled to a single entry point leading to the turbine. This system usually employs one turbocharger, but for engines with a higher number of cylinders, multiple turbochargers may be used. The heat energy of the exhaust gases is utilized to drive the turbine.
Advantages:
The system efficiently harnesses exhaust gas energy to drive the turbine, resulting in better efficiency.

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