Theory of Machine
The Ackermann steering mechanism is preferred to the Davis type in automobiles because

The former is mathematically accurate
The former is most rigid
The former is having turning pair
The former is most economical

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
For automatic adjustment of belt position so that belt runs centrally
In decreasing the slip of the belt
Increase belt and pulley life

ANSWER DOWNLOAD EXAMIANS APP