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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)

5 d
3 d
2 d
4 d

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

None of these
Shear strength is equal to crushing strength
Shear strength is greater than crushing strength
Shear strength is less than crushing strength

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

Height
Inside diameter
Outside diameter
Pitch diameter

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

P
F.P
F
F + P

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Machine Design
A bench vice has following type of threads

Metric
Square
Acme
Buttress

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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

15 mm
25 mm
5 mm
10 mm

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