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Machine Design

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

Square
NPT (national pipe threads).
Metric
Buttress

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/2σt
pd/σt
pd/3σt
pd/4σt

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

20 times
5 times
15 times
10 times

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Machine Design
The ball bearings are provided with a cage

To prevent the lubricant from flowing out
To reduce friction
To facilitate slipping of balls
To maintain the balls at a fixed distance apart

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Butt joint with single cover plate
Any one of the above
Butt joint with double cover plate
Lap joint with one ring overlapping the other

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Machine Design
In V-belt drive, belt touches

Could touch anywhere
Both at bottom and sides
At sides only
At bottom

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