Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

Module
Circular pitch
Diametral pitch
None of these

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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 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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