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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Cobalt and molybdenum
Nickel
Chromium
Nickel and chromium

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Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the nominal stress
Nominal stress to the maximum stress
Maximum stress to the endurance limit
Nominal stress to the endurance limit

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Machine Design
Which one of the following is a positive drive?

Chain drive
Crossed flat belt drive
V-belt drive
Rope drive

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Just below the surface
Surface
None of these

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Machine Design
In a marine flange coupling, the thickness of flange is taken as

3d/4
d/4
d/2
d/3

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2
W/9
8W/9
2W/3

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