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Machine Design

Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

All of these
Shear
Tension
Compression

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ - k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)

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Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Tensile stress
Shear stress
Combined tensile and shear stress
Any one of these

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Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

6
4
8
10

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Machine Design
The groove angle of pulleys for V-belt is

340 to 360
More than 400
420 to 450
300 to 320

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Remains unchanged
None of these
Increases
Decreases

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