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Machine Design

Machine Design
In a flange coupling, the flanges are coupled together by means of

Headless taper bolts
None of these
Studs
Bolts and nuts

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

⅟₂× (P1 + P2)
[(√P1 + √P2)/2]²
P1 + P2
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
Resistance to fatigue of a material is measured by

Young's modulus
Endurance limit
Elastic limit
Coefficient of elasticity

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

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

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Machine Design
Which one of the following is a positive drive?

Rope drive
Chain drive
V-belt drive
Crossed flat belt drive

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Right hand with fine pitch
Could be left or right hand
Left hand with same pitch

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