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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

18
20
8
12

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

22.5°
45°
90°
67.5°

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Machine Design
A localized compressive stress at the area of contact between two members is known as

Shear stress
Tensile stress
Bending stress
Bearing stress

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Reduce the effort needed for lifting the working load
Reduce the value of frictional torque
Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack

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Machine Design
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as

Comformability
Embeddability
Fatigue strength
Bondability

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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

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

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