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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Ps /P
Pc /P
Least of Pt, Ps and Pc/P
Pt /P

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

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

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be

(6V/ π)2
(6V/ π)3
(6V/ π)1/2
(6V/ π)1/3

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Machine Design
Factor of safety for fatigue loading is the ratio of

Elastic limit to the working stress
Elastic limit to the yield point
Young's modulus to the ultimate tensile strength
Endurance limit to the working stress

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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
According to maximum normal stress theory, the maximum normal stress in the shaft is

σ + √(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)
√(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]

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