Machine Design
The ball bearings are provided with a cage

To facilitate slipping of balls
To prevent the lubricant from flowing out
To maintain the balls at a fixed distance apart
To reduce friction

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A hollow saddle key is

A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits half in the key way of hub and half in the key way of shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Acceleration/retardation of masses plus stress due to bending
Bending plus stress due to acceleration/retardation
Axial load plus stress due to acceleration/retardation
Axial load plus stress due to bending

ANSWER DOWNLOAD EXAMIANS APP