Mechanical Engineering MCQs

In a hydrodynamic lubricated bearing

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there is a thick film of lubricant between the journal and the bearing
there is a thin film of lubricant between the journal and the bearing
there is no lubricant between the journal and the bearing
the lubricant is forced between the journal and the bearing, by external pressure
✅ The correct answer is option A.

In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.

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Correct
Incorrect
✅ The correct answer is option A.