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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Nickel and chromium
Cobalt and molybdenum
Nickel

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Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase its length
Tighten die bolt properly

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

Brittle
Elastic
Ductile
Plastic

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

None of these
Pitch lead angle
Pressure angle
Helix angle

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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

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

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Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.5 × diameter of bolt
Diameter of bolt
1.25 × diameter of bolt
0.75 × diameter of bolt

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