Machine Design
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.

Rectangular
Parallel
None of these
Square

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

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

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