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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel and chromium
Chromium
Cobalt and molybdenum
Nickel

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

Module
None of these
Circular pitch
Diametral pitch

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Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

Remain same
None of these
Decreases
Increases

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

15 mm
25 mm
10 mm
5 mm

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Increasing the cross-section area of bar
Decreasing the cross-section area of bar
Remain unaffected with cross-section area
Would depend upon other factors

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Machine Design
In designing thick cylinders, the equation used is

Lame's equation
Clavarinos' equation
All of these
Birnie's equation

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