Class 4 (4th Engineer) MEP 📅 Oct 2022

Exam Question

(a) What would happen to the amperage of a Centrifugal Pump if it were run with the discharge Valve shut? (4)

(b) What is the indication in the Exhaust Gas of Good Combustion? (4)

(d) Reasons for carrying out Boiler Feed Water Tests? (4)

Reference Answer

### (a) Amperage of a Centrifugal Pump with Discharge Valve Shut (4 Marks)
The amperage drawn by the electric motor of a centrifugal pump would **decrease significantly**, reaching its minimum running value when operated with the discharge valve fully shut.
**Reasoning:**
1. **Fundamental Pump Physics:** The power consumed by a centrifugal pump is directly proportional to the product of the flow rate (Q) and the total head (H) it generates, as well as the fluid density (ρ) and gravity (g). The hydraulic power formula is:

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