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Machine Design

Machine Design
The suitable material for belt used in flour mill is

Rubber
Leather
Canvas or cotton duck
Balata gum

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Machine Design
A screw is said to be over hauling screw, if the

Friction angle is less than helix angle
Efficiency of screw is 100%
Friction angle is equal to helix angle
Friction angle is more than helix angle

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Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

14
12
18
24

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

3-15 m/s
15-30 m/s
30-50 m/s
1-3 m/s

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Normalising
Process annealing
Full annealing
Spheroidising

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt
(p - d) t.σt
p.d.σt

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