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Machine Design

Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.55
0.65
0.75
0.45

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Machine Design
The shock absorbing capacity of a bolt can be increased by

Grinding the shank
Increasing shank diameter
Making shank diameter equal to core diameter of thread
Tightening it properly

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Machine Design
In a marine flange coupling, the thickness of flange is taken as

d/2
3d/4
d/3
d/4

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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

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

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Machine Design
The anti-friction bearings

Can carry both radial and thrust loads
Have low starting and low running friction at moderate speeds
Have high initial cost
All of these

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

Butt weld
Sleeve weld
Socket weld
Fillet weld

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