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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
Less
More
None of these

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

15-30 m/s
1-3 m/s
30-50 m/s
3-15 m/s

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Machine Design
A backing ring is used inside the pipe joint when making a

Sleeve weld
Fillet weld
Socket weld
Butt weld

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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)

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

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
16F/ 3πd²
6F/ πd²
4F/ πd²

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Machine Design
For tight leakage joints, following type of thread is best suited

Metric
NPT (national pipe threads).
Buttress
Square

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