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Machine Design

Machine Design
In Vickers hardness testing, the pyramid indentor apex is

122°
136°
40°
152°

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)
2μ sinθ/(θ + sinθ)
4μ sinθ/(2θ + sin 2θ)

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Direct shear stress only
Bending stress only
A combination of bending stress and direct shear stress
A combination of torsional shear stress and bending

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Machine Design
Maximum principal stress theory is applicable for

Elastic materials
Ductile materials
All of these
Brittle materials

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Machine Design
Surface endurance limit of gear material is dependent upon its

Elastic strength
Toughness
Brinell hardness number
Yield strength

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Machine Design
The taper on a rectangular sunk key is

1 in 48
1 in 32
1 in 16
1 in 100

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