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Machine Design

Machine Design
Guest's theory of failure is applicable for following type of materials

Brittle
Plastic
Ductile
Elastic

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Machine Design
A bench vice has following type of threads

Acme
Square
Buttress
Metric

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Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (360°/T)
p = D sin (120°/T)
p = D sin (180°/T)
p = D sin (90°/T)

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Machine Design
Two shafts will have equal strength, if

Diameter of both the shafts is same
Angle of twist of both the shafts is same
Twisting moment of both the shafts is same
Material of both the shafts is same

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

30-50 m/s
15-30 m/s
1-3 m/s
3-15 m/s

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Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

One end fixed and the other end free
Both the ends hinged
One end fixed and the other end hinged
Both the ends fixed

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