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Machine Design

Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.6
0.25
0.5
0.2

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.26
1.58
1.06
1.12

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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)

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

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Machine Design
Which of the following is a permanent fastening?

Rivets
Keys
Cotters
Bolts

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Machine Design
In levers, leverage is the ratio of

Load lifted to the effort applied
Effort arm to the load arm
Mechanical advantage to the velocity ratio
Load arm to the effort arm

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Machine Design
Which of the following bearing is preferred for oscillating conditions?

Double row roller bearing
Needle roller bearing
Taper roller bearing
Angular contact single row ball bearing

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