Machine Design
Brittle coating technique is used for

Protecting metal against wear and tear
Determining brittleness
Protecting metal against corrosion
Experimental stress analysis

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Machine Design
A bolt of uniform strength can be developed by

Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion
None of these

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Machine Design
When the belt speed increases

Power transmitted increases to a maximum value and then decreases
Power transmitted increases
Power transmitted decreases
Power transmitted remains the same

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