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MACHINE DESIGN

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
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

90° - φ
45° - φ
45° + φ/2
45° - φ/2

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Machine Design
Brittle coating technique is used for

Protecting metal against corrosion
Determining brittleness
Protecting metal against wear and tear
Experimental stress analysis

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum distortion energy theory
Maximum shear stress theory
Maximum strain energy theory
Maximum principal stress theory

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Normalising
Spheroidising
Full annealing
Process annealing

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