Class 4 (4th Engineer) MEKG 📅 Aug 2022

Exam Question

(a) With reference to centrifugal pumps:

(i) Sketch typical discharge characteristics showing variations of throughput as the discharge head and speeds are altered (4)

(ii) Explain why this characteristic profile is desirable (4)

(b) Explain the relavance of discharge characteristic for the selection of an emergency fire pump (8)

Reference Answer

### (a) Centrifugal Pump Discharge Characteristics
**(i) Sketch of Typical Discharge Characteristics**
The discharge characteristics of a centrifugal pump are typically represented by a set of performance curves. These curves plot the Discharge Head (H) on the vertical axis against the Throughput or Flow Rate (Q) on the horizontal axis. A separate curve is drawn for each specific operational speed (N) of the pump.
**Key features of the characteristic curves:**

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