Machine Design
A coupling used to connect two perfectly aligned shafts, is

All of these
Muff coupling
Compression coupling
Flange coupling

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged at right angles and rotate in one definite direction
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 parallel and rotate in the opposite directions

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