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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

16
8
4
2

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Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

None of these
Circular pitch
Diametral pitch
Module

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.4 times
0.8 times
0.6 times

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

2μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)
4μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)

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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/σt
pd/3σt
pd/2σt
pd/4σt

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Decreases
Increases
Remains unchanged
None of these

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