What is the MAIN function of motor oil? Improve the sealing of piston rings
Clean the engine from sludge and varnish
Reduce friction and wear on moving parts
• Neutralize acids
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Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?