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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/2
d/6
d/8
d/4

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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 included angle for the British Association thread is

47.3°
55°
60°
29°

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

P1 + P2
⅟₂× (P1 + P2)
[(√P1 + √P2)/2]²
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
The material used for brake lining should have __________ coefficient of friction.

Low
Moderate
High
None of these

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Machine Design
The function of cutting oil when threading a pipe is to

All of these
Provide cooling action
Help removes chips
Lubricate the dies

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