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Machine Design

Machine Design
The cold working of metals is carried out __________ the recrystallization temperature.

None of these
Below
At
Above

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Machine Design
The included angle in unified of American National threads is

29°
60°
47°
55°

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

2 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
(π/4) d² × τ × n
1.875 × (π/4) d² × τ × n

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Machine Design
The distribution of the forces along the length of key fitted in a shaft

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

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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
ZN/p
Z/pN
p/ZN

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Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Both A and B is correct
Only A is correct
Load taken by each spring will be half the total load
Shear stress in each spring will be equal

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