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Machine Design

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

4
8
2
6

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Machine Design
The application of third type levers is found in

Lever of a loaded safety valve
A pair of tongs
Hand wheel of a punching press
Handle of a hand pump

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2.5 d
1.5 d
d
2 d

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

None of these
Shaft A is better than shaft B
Both the shafts are equally good
Shaft B is better than shaft A

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Machine Design
Brittle coating technique is used for

Protecting metal against corrosion
Determining brittleness
Experimental stress analysis
Protecting metal against wear and tear

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Machine Design
The helix angle for single helical gears ranges from

10° to 15°
35° to 50°
20° to 35°
15° to 20°

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