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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Chromium
Cobalt and molybdenum
Nickel
Nickel and chromium

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

15-30 m/s
30-50 m/s
1-3 m/s
3-15 m/s

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Machine Design
The taper on a rectangular sunk key is

1 in 16
1 in 100
1 in 48
1 in 32

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Machine Design
Yield point in fatigue loading as compared to static loading is

Depends on other factors
Same
Lower
Higher

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ + T₂ + Tc)/2
(T₁ - T₂ + Tc)/2
T₁ + T₂ + Tc
T₁ - T₂ + Tc

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Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Viscosity, speed and bearing pressure
Viscosity, speed and load
Length, width and speed
Length, width and load

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