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Machine Design

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
43869
43929

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

N/Zp
p/ZN
ZN/p
Z/pN

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Machine Design
Oil in journal bearing should be applied at the point where load is

Maximum
Average
Nil or lightest
Any one of the above

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

3W/A
W/2A
W/A
2W/A

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/3σt
pd/2σt
pd/σt
pd/4σt

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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

M8 - 6d
M8
M6 - 8d
M6

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