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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 24
1 in 10
1 in 40
1 in 5

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Machine Design
Gears are casted by

Sand mould casting
Slush casting
Permanent mould casting
Centrifugal casting

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Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

1.6 d
2.5 d
2 d
1.2 d

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Equal to 50%
More than 50%
None of these
Less than 50%

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Machine Design
For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is

1/sinθ
sinθ cosθ
1/cosθ
1/tanθ

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Machine Design
Stress concentration in static loading is more serious in

Equally serious in both cases
Depends on other factors
Brittle materials
Ductile materials

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