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Machine Design

Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

0.8 d
1.2 d
d
0.5 d

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Machine Design
A coupling used to connect two perfectly aligned shafts, is

Flange coupling
All of these
Compression coupling
Muff coupling

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 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
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Increases
Decreases
Remains unchanged
None of these

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T sec³φ
T sec²φ
T/sec³φ
T cosecφ

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Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Hydrodynamic lubricated bearing
Hydrostatic lubricated bearing
Zero film bearing
Boundary lubricated bearing

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