Which of the following viscosity indices shows the larger changes in viscosity with temperature?
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Which of the following of oils is multi-grade oil?
Which of the following oils has the highest viscosity?
The vegetable oils are used as lubricants in the automobiles.
Swirl is the rotational flow of charge within the cylinder about the axis.
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.
____________ 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 _____________
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