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Machine Design

Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/A
2W/A
W/2A
3W/A

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Machine Design
Idler pulley is used for

Changing the direction of motion of belt
For applying tension
All of these
Increasing velocity ratio

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Machine Design
In radial bearings, the load acts __________ to the axis of rotation.

Both A and B
Perpendicular
Parallel
None of these

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
3000-4000 kg/cm²
4000-4500 kg/cm²
2000-3000 kg/m²

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Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Square
Metric
Acme
Buttress

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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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