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Machine Design

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

40°
136°
152°
122°

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2050 N-m
2136 N-m
2000 N-m
2100 N-m

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-eighth
One-half
One-fourth
Double

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Remain same
Increases markedly
Depends on heat treatment carried out
Decreases markedly

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Machine Design
Which of the following is not correct procedure to increase the fatigue limit?

Shot peening
Cold working
Under stressing
Surface decarburisation

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Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Combined tensile and shear stress
Tensile stress
Any one of these
Shear stress

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