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. ...
There are various properties of fluid 1.) MASS DENSITY - It is defined as mass of fluid per unit volume. It is generally denoted by ρ (Rho). S.I unit = kg/m³ The mass density of water is taken as 1000 kg/ m³ at 4°C 2.) SPECIFIC WEIGHT. - It may be defined as the weight of fluid per unit volume.It is generally denoted by w. S.I unit = N/m³ It is increase with increase in pressure. The specific weight of water is taken as 9810 N/m³ at 4°C. IMPORTANT NOTE:- *Relationship between specific weight and mass density:- w = ρ× g Specific weight = (mass density × Acceleration due to gravity) 3.) SPECIFIC VOLUME - It may be defined as the volume occupied by the fluid per unit mass. It is generally denoted by v. OR It may be defined as the reciprocal of mass density. It commonly applied to gasses. v = 1/p Specific volume = 1/ Rho S.I ...