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Machine Design

Machine Design
The railway carriage couplings have

Buttress threads
Square threads
Knuckle threads
Acme threads

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

d + 17 mm
2d + 20 mm
2d + 13 mm
3.5d

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Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

Same
None of these
Higher
Lower

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Varies exponentially, being less at the torque-input end
Varies exponentially, being more at the torque-input end
Is uniform throughout
Varies linearly

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Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Increase the belt velocity
Prevent the belt joint from damaging the belt surface
Prevent the belt from running off the pulley
Increase the power transmission capacity

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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

F.P
F + P
P
F

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