Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to have more flexibility in design
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke
It is desired to improve tyre to ground contact characteristics

ANSWER DOWNLOAD EXAMIANS APP

Automobile Engineering in ME
When the front wheels of a vehicle are locked during braking, then

Stopping distance becomes extremely long
Rear tyres skid across the road surface, and the vehicle spins around
Driver loses control over the steering, and the vehicle continues moving in its current direction
Front tyres skid across the road surface, and the vehicle spins around

ANSWER DOWNLOAD EXAMIANS APP