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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A tap bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has pointed threads
Has both the ends threaded
Has a head on one end and a nut fitted to the other

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
In hydrostatic bearings

The Oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease is used for lubrication

ANSWER DOWNLOAD EXAMIANS APP