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Machine Design

Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

4 mm
5 mm
7 mm
6 mm

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Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Feather key
Woodruff key
Gib-head key
Tangent key

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Machine Design
Antifriction bearings are

Sleeve bearings
Thin lubricated bearings
None of these
Hydrodynamic bearings

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Left hand with same pitch
Could be left or right hand
Right hand with fine pitch
Right hand with same pitch

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Machine Design
The fatigue life of a part can be improved by

Coating
Polishing
Shot peening
Electroplating

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Machine Design
In a multiple V-belt drive, if one of the belts break, then

The entire set of belts is replaced
Only the broken belt is replaced
The broken belt need not to be replaced
The broken belt and the belt on either side of it, is replaced

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