Class 4 (4th Engineer) MEKM 📅 Feb 2024

Exam Question

(a) What is the definition of the following terms: (6)

(i) Indicated Power

(ii) Specific fuel oil consumption

(iii) Brake power

(iv) Mechanical efficiency

(v) Thermal efficiency

(b) What is an Indicator Diagram of a diesel engine? Draw a diagram and show different points related to Diesel Engine power measurement. (6)

Reference Answer

### (a) Definitions of Engine Performance Terms
**(i) Indicated Power (IP)**
* **Definition:** Indicated Power is the theoretical total power developed within the engine cylinders by the pressure of the expanding gases acting on the pistons. It is the gross power generated by the combustion process before any deductions for frictional losses.
* **Measurement:** It is calculated from an indicator diagram, which is a plot of cylinder pressure versus piston displacement (or volume).

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