The _____________ is defined by the parallel portion of the piston and cylinder head which almost touch each other as the piston approaches T.D.C.
View Answer Explanation
____________ consists of randomly dispersed vortices of different sizes which become superimposed into the air and petrol mixture flow stream.
The amount of vortex activity,and the disintegration of others, _____________ the turbulent flow with rising engine speed.
The degree of turbulence increases _____________ with the piston speed.
Turbulence decreases the heat flow to the cylinder wall and in the limit excessive turbulence may extinguish the flame.
The flame propagation velocities range from _____________
When ignition occurs the nucleus of the flame spreads with the whirling or rotating vortices in the form of ragged burning crust from the initial spark plug ignition site.
Swirl ratio is defined as the ratio of air rotational speed to crankshaft rotational speed.
Abnormal combustion knock produced by surface ignition in SI engines is not harmful as normal combustion knock.
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called ___________
Compression ratio of I.C. engine is ___________
All Engineering MCQs