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Machine Design

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

Nominal size
Actual size
Basic size
Tolerance

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Machine Design
In radial bearings, the load acts __________ to the axis of rotation.

Both A and B
Perpendicular
Parallel
None of these

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(2WD/ πd3) × K
(8WD/ πd3) × K
(WD/ πd3) × K
(4WD/ πd3) × K

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Machine Design
Antifriction bearings are

Thin lubricated bearings
None of these
Sleeve bearings
Hydrodynamic bearings

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

168 d
151 d
138 d
124 d

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Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Leak-proof
Stronger in tension
Free from corrosion

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