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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)

3 d
4 d
2 d
5 d

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα

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Machine Design
Gear box is used

To produce torque
To increase efficiency of system
For speed reduction
To obtain variable speeds

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Machine Design
Which of the following spring is used in mechanical wrist watch?

Belleville spring
Helical compression spring
Spiral spring
Torsion spring

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Machine Design
The stretching in a belt can be controlled by __________ the stress in the belt.

Increasing
Reducing
None of these
Both A and B

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

4F/ πd²
16F/ 3πd²
6F/ πd²
8F/ πd²

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