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DIFFERENCE BETWEEN S.I AND C.I ENGINES

Criteria S.I. Engine (Petrol or Spark Ignition Engine) C.I. Engine (Diesel or Compression Ignition Engine) Working Cycle Works on Otto Cycle or Constant Volume Cycle. Works on Diesel Cycle. Mixture During Suction Stroke Takes a mixture of air and petrol during the suction stroke. Takes only air during the suction stroke. Fuel Used Uses petrol as fuel. Uses diesel as fuel. Compression Ratio Has a compression ratio that varies from 6 to 10. Has a compression ratio that varies from 16 to 20. Engine Weight and Cost S.I. engines are lighter and cheaper. C.I. engines are heavier and costlier. Initial Cost Initial cost is lower compared to C.I. engines. Initial cost is high due to high compression ratio. Starting Starting is easy. Starting is difficult, especially in cold conditions. ...

Mechanisms Page No-1

 1. Machine:-  A machine is a device that receives energy in some available form and utilizes it to perform a specific type of work.

 2. Theory of Machines (T.O.M):- 
It deals with the study of the relative motion between the various parts of a machine and the forces that act on them.

Sub-divisions:-

1.Kinematics of Machines:-  Focuses on the relative motion between the parts of a machine without considering the forces that cause this motion.

2.Dynamics of Machines:- Focuses on the relative motion between the parts of a machine while considering the forces acting on them when they are in motion.

It is subdivided into 2 .

 a. Statics:- Deals with the study of forces acting on the various parts of a machine when the parts are at rest.
 b. Kinetics:- Deals with the inertia forces due to mass and motion considerations


Q-2: Define Rigid Body
Ans:- A rigid body may be defined as a body which can retain its shape and size when applied to some external forces.

Q-3: Resistant Body:- A resistant body is a body which does not suffer appreciable distortion or change in physical form by the forces acting on it.

•Examples:-
- Belt
- Ropes
- Chains
- Springs

Q-4: Link or Elements:- Each part of a mechanism which moves relative to other parts.
Examples:-
- Piston
- Piston Rod

Types of Link

1. Rigid Link:- A link which does not undergo any deformation while transmitting motion.
   Examples:- Connecting rod, Crank

2. Flexible Link:- A link which is partly deformed in such a way that transmission of motion is not affected.
Examples:-Belt, Ropes, Spring, Chain

 3.Fluid Link :- It is formed by having fluid in a receptacle. Motion is transmitted through the fluid by pressure.
Examples:-
  - Hydraulic Jack
  - Hydraulic Press

Q-5: Structure:- It is an assembly of a number of resistant bodies having no relative motion between them and taking up loads having straining actions.
Examples:-
  - Roof
  - Trusses
  - Bridge
  - Building, etc.

Q-6: Frame:- It is a structure which supports the moving parts of a machine.

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