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Machine Design

Machine Design
The product of the diametral pitch and circular pitch is equal to

π × number of teeth
1/π
1
π

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M6
M6 - 8d
M8 - 6d
M8

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

εc + 2εl
εc + εl²
εc² + εl
2εc + εl

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Machine Design
Which one of the following is a positive drive?

Chain drive
Crossed flat belt drive
Rope drive
V-belt drive

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Machine Design
The number of slots in a 25 mm castle nut is

8
4
2
6

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Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

44047
44045
43929
43869

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