THERMODYNAMICS ASSIGNMENT QUESTIONS AND ANSWERS

   The thermodynamics assignment to be submitted today is solved below :
     QUESTION
1. What is a diesel engine.
2. Compare and Contrast between diesel engine and petrol engine.
 
    ANSWERS
  1. The diesel engine is an internal combustion engine in which ignition of fuel that has been injected into the combustion chamber is initiated by the high temperature which a gas achieves when greatly compressed (Adiabatically).
   Diesel engines are made up of four strokes namely : The Intake Stroke, The Compression  Stroke, The Combustion Stroke and The Exhaust Stroke.

 2a. Similarities between petrol engine and diesel engine are :
I. They both convert chemical energy from the fuel to mechanical energy through a series of explosions.
ii They both cause environmental pollution.
iii The exhaust strokes in both engines push exhausts through the exhaust valve.
iv The combustion cycles are similar in both engines.

2b. Differences between petrol engine and diesel engine are :
1. Petrol engine has spark plug while diesel engine don't have.
2. Petrol engine uses petrol as fuel while diesel engine uses diesel as fuel.
3. Petrol engine is found in smaller vehicles eg cars and motorcycle while diesel engine is found in larger vehicles eg trucks and buses.
4. Petrol engine is less durable while diesel engine is more durable
5. Petrol engine is less expensive while diesel engine is more expensive.
6. Petrol engine has lower efficiency while diesel engine has higher efficiency.