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Machine Design

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Largest
None of these
Smallest
Effective

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Machine Design
Lewis equation is applied

Only to the gear
To weaker of the pinion or gear
To stronger of the pinion or gear
Only to the pinion

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Machine Design
The square threads are usually found on

Spindles of bench vices
Railway carriage couplings
Screw cutting lathes
Feed mechanism of machine tools

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Machine Design
The number of slots in a 25 mm castle nut is

4
2
6
8

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

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

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

5 to 10
1 to 2
0.5 to 1
3 to 5

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