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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

25
10
20
15

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Machine Design
The square threads are usually found on

Screw cutting lathes
Feed mechanism of machine tools
Railway carriage couplings
Spindles of bench vices

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Machine Design
The cross-section of the arm of a bell crank lever is

Elliptical
I-section
Any one of these
Rectangular

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = 1.6√t
d = 6√t
d = 2√t
d = √t

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.97
0.98
0.96
0.99

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Machine Design
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

None of these
Soderberg relation
Goodman relation
Gerber relation

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