Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Hot working
Grinding and lapping surface
Shot peening
Cold working

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Belts are available in sets
New and old belts will cause vibrations
The new belt will carry more than its share and result in short life
Only one belt cannot be fitted with other used belts

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Which one is rigid will depend on several other factors
Both will be equally rigid

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