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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Buttress
Square
Metric
NPT (national pipe threads).

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Machine Design
The product of the diametral pitch and circular pitch is equal to

π
1/π
π × number of teeth
1

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Machine Design
The size of a gear is usually specified by

Pressure angle
Diametral pitch
Pitch circle diameter
Circular pitch

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

None of these
Equal to 50%
Less than 50%
More than 50%

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Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.5 × diameter of bolt
Diameter of bolt
0.75 × diameter of bolt
1.25 × diameter of bolt

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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

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

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