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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

1 to 2
0.5 to 1
5 to 10
3 to 5

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Machine Design
The static tooth load should be __________ the dynamic load.

Less than
Greater than
Equal to
None of these

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Machine Design
Which one of the following loading is considered for the design of axles?

Combined action of bending moment, twisting moment and axial thrust
Combined bending moment and twisting moments
Twisting moment only
Bending moment only

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Machine Design
The included angle for the British standard whitworth thread is

29°
60°
55°
47.5°

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα

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Machine Design
Idler pulley is used for

Changing the direction of motion of belt
Increasing velocity ratio
For applying tension
All of these

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