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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

15
20
10
25

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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
Shear stress theory is applicable for

Ductile materials
All of these
Brittle materials
Elastic materials

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Machine Design
The smallest diameter of an external or internal screw thread is known as

Minor diameter
Major diameter
Pitch diameter
None of these

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Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the nominal stress
Maximum stress to the endurance limit
Nominal stress to the endurance limit
Nominal stress to the maximum stress

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
24 kN/m
6 kN/m
30 kN/m

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