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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Nickel
Cobalt and molybdenum
Nickel and chromium

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of these
Shear strength is equal to crushing strength

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.06
1.26
1.58

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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))

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

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

None of these
Hollow saddle key
Soft key
Hollow key

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Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Completely reversed loading
Static loading
Dynamic loading
Combined static and dynamic loading

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