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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

1.6 d
2.5 d
1.2 d
2 d

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Machine Design
Antifriction bearings are

None of these
Sleeve bearings
Thin lubricated bearings
Hydrodynamic bearings

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Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Jam nut
Castle nut
Ring nut
Sawn nut

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Machine Design
Which of the following is a permanent fastening?

Bolts
Cotters
Keys
Rivets

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.8 times
0.6 times
0.7 times
0.4 times

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

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