Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

None of these
0.40 to 0.60%
0.20 to 0.40%
0.35 to 0.45%

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Machine Design
Machine screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Similar to stud
Used to prevent relative motion between two parts

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction

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Machine Design
Jam nut is a locking device in which

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
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
A slot is cut partly in middle of nut and then slot reduced by tightening a screw

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