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Machine Design

Machine Design
Which of the following material has the maximum ductility?

Mild steel
Aluminium
Zinc
Copper

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Machine Design
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

Square threads
Knuckle threads
Buttress threads
Acme threads

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Factor of safety
Strain
Bulk modulus
Elastic limit

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

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Machine Design
The design of pin of a rocker arm of an I.C. engine is based on

Shearing failure
Bending failure
All of these
Bearing failure

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Increase with increase in y
Depend on other considerations
Be independent of ratio of mass of load W to mass of bar (y)
Decrease with decrease in y

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