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
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
A taper key which fits half in the key way of hub and half in the key way of shaft

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Turn buckle has

Left hand threads on one end and right hand threads on other end
No threads
Left hand threads on both ends
Right hand threads on bout ends

ANSWER DOWNLOAD EXAMIANS APP