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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Nickel and chromium
Nickel
Cobalt and molybdenum

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Bending stress
Shear stress
Tensile stress
Compressive stress

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Depend on other considerations
Increase with increase in y
Decrease with decrease in y
Be independent of ratio of mass of load W to mass of bar (y)

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Bolts will not loosen during service
Bolts are weakest elements
Joint may not open up
The resultant load on the bolt would not be affected by the external cyclic load

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Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.25 and 0.50
0.1 and 0.25
0.50 and 0.75
0.75 and 1

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Machine Design
The included angle for the V-belt is usually

10°-20°
40°-60°
60°-80°
30°-40°

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