21. The ball bearings are, usually, made from
22. When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.
23. The arms of the pulleys for flat belt drive have
24. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the
25. A shaft coupling should
26. When carbon in the cast iron is principally in the form of graphite, the cast iron will be of
27. In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that
28. A rivet is specified by
29. Resilience of a material is important, when it is subjected to
30. In testing a material for endurance strength, it is subjected to
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