Exam Question
Define each of the following terms and explain its relavance to combustion:
(a) Cetane number (4)
(b) After burning (4)
(c) Ignition delay (4)
(d) Detonation (4)
Class 4 (4th Engineer)
MEKM
📅 Sep 2022
Reference Answer
### (a) Cetane Number
**Definition:**
The Cetane Number (CN) is a dimensionless measure of the ignition quality of a diesel fuel. It quantifies the fuel's readiness to auto-ignite under the high temperature and pressure conditions found in a compression-ignition engine cylinder. A higher cetane number corresponds to a shorter ignition delay period and better ignition quality.
**Determination:**
**Definition:**
The Cetane Number (CN) is a dimensionless measure of the ignition quality of a diesel fuel. It quantifies the fuel's readiness to auto-ignite under the high temperature and pressure conditions found in a compression-ignition engine cylinder. A higher cetane number corresponds to a shorter ignition delay period and better ignition quality.
**Determination:**
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play