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

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Machine Design
Which of the following statement is correct regarding power screws?

Both (A) and (B)
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
The efficiency of a self locking screw can not be more than 50%
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

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