FA-ACTIVITY-04, for NSQF-AUTOMOBILE level2(SSLC) ,ENGINE technical terms

 

FA-04 ENGINE

ACTIVITY NAME:Technical terms/ Terminology of Engine

Technical terms/ Terminology of Engine

source:-ExtruDesign

• Top Dead Center (T.D.C): "It is the top most position of the piston towards                                                                       cylinder head".

     •  Bottom Dead Center (B.D.C): "It is the lowest position of the piston farthest                                                                 from the cylinder head.

     •  Bore: Diameter of the engine cylinder is called bore. 

     • Stroke: Distance traveled by the piston in moving from T.D.C. to the B.D.C is                             called ‘stroke’. 

     • Clearance Volume: The volume of cylinder above the piston when it is in the                                             T.D.C. position is referred to as ‘clearance volume’ (Vc).  

    • Piston Displacement: This is the volume swept by the piston in moving from                                                 T.D.C. to B.D.C. This is also called ‘swept volume’. 

        If ‘d’ is the cylinder bore 

           ‘S’ the stroke, 

           'Vs' the piston displacement,     

            

                                                 

     • Engine Capacity: This is the total piston displacement or the Swept volume of all the cylinders.

 If ‘n’ is the number of cylinders and Vs is the piston displacement, then ‘engine displacement’ or engine capacity Vd, is given by, 

 

                                                           Vd = Vs.n 

 

• Compression Ratio: This indicates the extent to which the charge in the engine is compressed. 

This is calculated as the ratio of the volume above the piston at B.D.C. to the volume above the piston at T.D.C. 

If ‘y’ is the compression ratio, then 

For petrol engines, compression ratios are about 8 to 9.5 : 1, 

whereas for diesel engines, these vary from 16 to 22. 

• Power: It is the work done in a given period of time. 

• Horse Power (H.P.): This is the amount of energy required to do 4500kgm. of work in one minute.

 • Indicated Horse Power (I.H.P): The power developed within the engine cylinders is called indicated horse power. This is calculated from the area of the engine indicator diagram.

 • Brake Horse Power (B.H.P): This is the actual power delivered at the crankshaft. It is obtained by deducting various power losses in the engine from the indicated horse power. 

• Friction Horse Power (F.H.P.): This is the power lost due to friction present between different matching components. 

                        FHP=IHP-BHP 

Engine Torque: It is the force of rotation acting about the crankshaft axis at any given instant of time. It is expressed in newton-metre (Nm). 

source:-ExtruDesign

***(Note-

1.Students try to collect the picture from internet or photography from your surrounding area and attach to activity.

2.Draw a neat diagram of IC engine technical term fig and label the parts.

3.Add the Technical terms explanation figure.

2. Create a front page for the activity.)***