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Machine Design

Machine Design
The included angle in unified of American National threads is

60°
29°
47°
55°

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Machine Design
A saddle key __________ power through frictional resistance only.

Either A or B
Transmits
Does not transmit
None of these

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Machine Design
The resistance to fatigue of a material is measured by

Endurance limit
Elastic limit
Ultimate tensile strength
Young's modulus

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Machine Design
Auto frettage is the method of

Joining thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
Calculating stresses in thick cylinders

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Accuracy of shaft alignment
Low starting and low running friction except at very high speeds
All of these
Small overall dimensions

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

t.τu
πd.t.τu
π/4 × d² × tτu
π/4 × d².τu

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