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Class 4 (4th Engineer) MEKM 📅 Sep 2024

Exam Question

(a) How power is calculated from Indicator diagrams? (6)

(b) How does Indicator diagram show early fuel injection?

What are effects of too early injection? (5)

(c) What are indications of late Injection on indicator diagram of the unit?

What are bad effects of late injection of fuel on the units? (5)

Exam question diagram

Reference Answer

**(a) How power is calculated from Indicator diagrams?**
The indicator diagram, specifically the pressure-volume (P-V) diagram, is a fundamental tool for evaluating the work done within an engine cylinder and subsequently calculating the Indicated Power (IP).
* **Concept of Indicated Power (IP):** Indicated Power is the power developed by the combustion gases inside the engine cylinders, before any frictional losses within the engine mechanism itself. It represents the gross power available to drive the piston.
* **Method of Calculation:**

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