According to the ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength.

Mechanical Engineering : Machine Design - Quiz(MCQ)

X=30 Y=18

X=18 Y=18

X=18 Y=30

X=30 Y=30

Correct Answer : Option (A) : X=30 Y=18

Explanation : ASME Standard. The lesser value is taken among the two.

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Which type of rope drum is preferred?

Drums with helical grooves

Plain cylindrical drums

Both are equally preferred

None of the above

Correct Answer : Drums with helical grooves

Explanation : They have more bearing surface of the drum and prevent friction between adjacent turns of the rope.

Small sheaves are preferred over large sheaves on what parameters?

Higher cost of small sheaves

Increasingly centrifugal force in large sheaves

Preferring centrifugal force reduction even for more money

None of the above

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The wire rope is subjected to

Tensile Stress

Bending Stress

Both bending and tensile stress

None of the above

Correct Answer : Both bending and tensile stress

Explanation : There is direct tensile stress due to load being raised as well as bending stress.