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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

5 d
4 d
2 d
3 d

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

0.75/ (0.75 + √v)
6/ (6 + v)
3/ (3 + v)
4.5/ (4.5 + v)

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Machine Design
For steel, the ultimate strength in shear as compared to ultimate strength in tension is

43864
43833
43834
43832

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l
2 l
l/2
l/√2

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Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

None of these
Increases
Decreases
Remains constant

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

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

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