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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Aluminium
Cast iron
Mild steel
Brass

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.8 times
0.6 times
0.4 times

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt
(p - d) t.σt
p.d.σt

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Machine Design
All stresses produced in a belt are

Both tensile and compressive stresses
Tensile stresses
Shear stresses
Compressive stresses

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Machine Design
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

None of these
Either A or B
Thin film
Thick film

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Machine Design
Shear stress theory is applicable for

Ductile materials
All of these
Brittle materials
Elastic materials

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