Class 4 (4th Engineer) MEKM 📅 Dec 2023

Exam Question

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

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

Reference Answer

### (a) Power Calculation from Indicator Diagrams
An indicator diagram is a graphical representation of the pressure variation inside an engine cylinder versus the piston displacement (volume) throughout one complete engine cycle. The area enclosed by the diagram represents the work done by the gas on the piston during that cycle.
**Procedure for Calculating Indicated Power (IP):**
1. **Obtain the Diagram**: An engine indicator instrument is used to trace the pressure-volume loop onto a card. This is the indicator card or diagram.

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play