Machine Design
The designation M 33 × 2 of a bolt means

Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads with cross-section of 33 mm

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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
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
Provided in pairs at right angles and each key is to withstand torsion in one direction only

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Machine Design
A compound belt drive is used when

None of these
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions

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Machine Design
Jam nut is a locking device in which

A slot is cut partly in middle of nut and then slot reduced by tightening a screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

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