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Machine Design

Machine Design
The size of a gear is usually specified by

Pitch circle diameter
Diametral pitch
Circular pitch
Pressure angle

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Machine Design
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

Increases
Decreases
Remain same
None of these

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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 (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

P1 - P2
P1 + P2
⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Normalizing
Tempering
Annealing
Spheroidizing

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum shear stress theory
Maximum principal stress theory
Maximum distortion energy theory
Maximum strain energy theory

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

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