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Class 4 (4th Engineer) MEKM 📅 Oct 2023

Exam Question

When a medium speed diesel engine is used for propulsion purposes, a coupling is required between engine and reverse / reduction gear

(a) Sketch a hydraulic coupling for the above stated purposes. (6)

(b) Describe how it operates. (6)

(c) State what advantages such couplings have over their friction and magnetic alternatives. (4)

Exam question diagram

Reference Answer

### (a) Sketch of a Hydraulic Coupling
A diagram of a hydraulic coupling (also known as a fluid coupling) should clearly illustrate the following components:
* **Primary Wheel (Impeller/Pump):** This is connected to the input shaft, which is driven by the engine. It is a vaned rotor that acts as a centrifugal pump.
* **Secondary Wheel (Runner/Turbine):** This is connected to the output shaft, which drives the reverse/reduction gearbox. It is a vaned rotor that acts as a turbine.

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