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Machine Design

Machine Design
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

1
43832
4
2

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Machine Design
The rated life of a bearing varies

Inversely as cube of load
Inversely as fourth power of load
Directly as load
Inversely as square of load

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Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

5°
8°
15°
25°

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2
2W/3
W/9
8W/9

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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
The design of the pressure vessel is based on

Hoop stress
None of these
Longitudinal and hoop stress
Longitudinal stress

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