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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Cobalt and molybdenum
Nickel and chromium
Nickel

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

None of these
0.35 to 0.45%
0.20 to 0.40%
0.40 to 0.60%

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Machine Design
According to Indian standards, total numbers of tolerance grades are

20
8
12
18

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

29°
60°
55°
47°

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(3m /Pmax)
√(Pmax / m)
√(Pmax / 2m)
√(Pmax / 3m)

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

2P/s.l
√2P/s.l
P/√2.s.l
P/2.s.l

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