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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel and chromium
Cobalt and molybdenum
Chromium
Nickel

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Machine Design
A double strap butt joint (with equal straps) is

Either in single shear or double shear
Any one of these
Always in single shear
Always in double shear

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Machine Design
The groove angle of pulleys for V-belt is

340 to 360
More than 400
300 to 320
420 to 450

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = e–ᶠα
P1 / P2 = eᶠα

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Machine Design
A universal coupling is used to connect two shafts

Have lateral misalignment
Whose axes intersect at a small angle
Which are not in exact alignment
Which are perfectly aligned

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Butt joint with single cover plate
Butt joint with double cover plate
Any one of the above
Lap joint with one ring overlapping the other

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