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Machine Design

Machine Design
Ball bearing type screws are found in following application

Aeroplane engines
Screw jack
Steering mechanism
Crane

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Machine Design
The lower deviation is the algebraic difference between the

None of these
Actual size and the corresponding basic size
Minimum limit and the basic size
Maximum limit and the basic size

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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/4σt
pd/σt

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Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

None of these
Largest
Smallest
Effective

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Increases
Remains unchanged
None of these
Decreases

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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)

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

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