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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

4 d
2 d
5 d
3 d

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Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Diametral pitch
Axial pitch
Module
Normal pitch

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Machine Design
For tight leakage joints, following type of thread is best suited

Square
NPT (national pipe threads).
Metric
Buttress

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

2 × (π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
(π/4) d² × τ × n

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Machine Design
Idler pulley is used for

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

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt + 1)/ (Kf + 1)
(Kt - 1)/ (Kf - 1)
(Kf - 1)/ (Kt - 1)
(Kf + 1)/ (Kt + 1)

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