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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
None of these
More
Less

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Machine Design
Silver based solder is used for

Brazing
Soft soldering
Flaring
Fusion welding

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

None of these
Equal to 50%
More than 50%
Less than 50%

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Machine Design
The helix angle for double helical gears may be made up to

60°
75°
90°
45°

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

πd.t.τu
t.τu
π/4 × d².τu
π/4 × d² × tτu

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Machine Design
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

External load applied
Initial tension
Sum of the initial tension and external load applied
Initial tension or external load, whichever is greater

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