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Machine Design

Machine Design
The most important dimension in the design of a nut is

Inside diameter
Height
Outside diameter
Pitch diameter

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

(p - d) t.σt
p.d.σt
p.t.σt

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

10 mm
5 mm
25 mm
15 mm

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

0.75/ (0.75 + √v)
6/ (6 + v)
4.5/ (4.5 + v)
3/ (3 + v)

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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
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially upwards or downwards
Axially upwards
None of these
Axially downwards

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