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Machine Design

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

152°
40°
136°
122°

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Machine Design
Buttress threads are usually found on

Railway carriage couplings
Feed mechanisms
Screw cutting lathes
Spindles of bench vices

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/2a)]
σ [1 + (3a/b)]
σ [1 + (2a/b)]
σ [1 + (b/3a)]

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

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

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

10 microns
1 micron
0.1 micron
0.01 micron

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Machine Design
In radial bearings, the load acts __________ to the axis of rotation.

None of these
Both A and B
Parallel
Perpendicular

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