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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

15
25
17
21

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Machine Design
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

Either A or B
None of these
Partially
Fully

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Machine Design
The included angle for the V-belt is usually

60°-80°
40°-60°
30°-40°
10°-20°

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Machine Design
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

Elasticity
Malleability
Plasticity
Ductility

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Direct shear stress only
Bending stress only
A combination of bending stress and direct shear stress
A combination of torsional shear stress and bending

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Machine Design
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is

None of these
Less than 1/10
Equal to 1/10
Greater than 1/10

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