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

New and old belts will cause vibrations
Belts are available in sets
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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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Using steel tube in place of glass tube
Increasing the diameter of the tube
Filling nitrogen under pressure in the stem
Accounting for the tube expansion

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