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Machine Design

Machine Design
The difference between the upper limit and lower limit of a dimension is called

Basic size
Nominal size
Actual size
Tolerance

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
P1 - P2
P1 + P2

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Machine Design
The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.

Three times
Four times
Double
Same

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

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

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

70 to 83%
45 to 60%
63 to 70%
80 to 90%

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

10 N-m
5 N-m
7 N-m
15 N-m

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