Class 4 (4th Engineer) MEKG 📅 Nov 2023

Exam Question

(a) Define 'centrifugal pump' and where it is used on ships? Using a simple line diagram show a circuit which includes a centrifugal pump. Explain the meaning of 'suction lift' (6)

(b) Sketch and describe the construction of a centrifugal pump, labelling its parts. What is a 'lantern ring 'and why is it fitted? (10)

Reference Answer

### Part (a)
#### Definition of a Centrifugal Pump
A centrifugal pump is a type of roto-dynamic pump that uses rotational kinetic energy to raise the pressure of a fluid. The energy conversion is achieved in two main stages:
1. **Energy Input**: The fluid enters the pump along the axis of a rotating component called an **impeller**. The impeller vanes catch the fluid and accelerate it to a high velocity, imparting kinetic energy.

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