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Machine Design

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

Metric
Buttress
Square
NPT (national pipe threads).

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Machine Design
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Minimum tensile strength is 200 N/mm²
Maximum compressive strength is 200 N/mm²
Carbon content is 2%
Maximum shear strength is 200 N/mm²

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Machine Design
Auto frettage is the method of

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

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

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/2
d/8
d/6
d/4

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

2W/A
W/A
3W/A
W/2A

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