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Machine Design

Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

10
8
4
6

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

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

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

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

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Equal to 1
Less than unity
None of these
Greater than unity

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Machine Design
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

160°
180°
135°
90°

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Machine Design
The shock resistance of steel is increased by adding

Cobalt and molybdenum
Nickel
Chromium
Nickel and chromium

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