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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
22.5°
67.5°
45°

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

30 kN/m
24 kN/m
12 kN/m
6 kN/m

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Machine Design
If a material fails below its yield point, failure would be due to

Creep
Fatigue
Sudden loading
Straining

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Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.154 - (0.912/T)
0.124 - (0.684/T)
0.175 - (0.841/T)
None of these

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

8
6
4
10

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Machine Design
Taper usually provided on cotter is

1 in 10
1 in 5
1 in 24
1 in 40

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