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Machine Design

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

6
8
2
4

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Machine Design
Brittle coating technique is used for

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

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Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

2F/bh
3F/2bh
F/bh
4F/bh

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
τ/2
4 τ
τ

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Machine Design
In the assembly of pulley, key and shaft

Key is made the weakest
Key is made the strongest
All the three are designed for equal strength
Pulley is made the weakest

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Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.75 and 1
0.50 and 0.75
0.25 and 0.50
0.1 and 0.25

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