IC Engine Mock Test 7

1. The objective of lubrication is to absorb shocks between bearings and other parts and consequently reduce noise.

2. In the case of air cooling, the boundary layer as on the gas side offers great resistance, but the effect of this is compensated largely by providing more surface areas by way of cooling pins.

3. During the expansion process the temperature ____________ and then drops very rapidly during the release process.

4. The objective of lubrication is to reduce dirt and girt that might have crept between the rubbing parts.

5. The emulsification number is an index of the tendency of an oil to emulsify with water.

6. Fatty oils from animal and vegetable origin are sometimes used alone but are frequently mixed with mineral oils.

7. All the lubricating oil from the oil sump, must pass through an oil filter before it is supplied to the engine bearings.

8. The standard practice for sizing the exhaust valve is to make them a certain percentage ____________ than the inlet valves.

9. Lard oil is used for making lubricants for railway engines.

10. ____________ convection occurs when the fluid circulates by virtue of the natural differences in densities of hot and cold fluids.