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Machine Design

Machine Design
The cross-section of the arm of a bell crank lever is

Any one of these
Rectangular
Elliptical
I-section

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Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (360°/T)
p = D sin (180°/T)
p = D sin (90°/T)
p = D sin (120°/T)

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

ZN/p
Z/pN
p/ZN
N/Zp

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Machine Design
In the assembly of pulley, key and shaft

All the three are designed for equal strength
Key is made the strongest
Pulley is made the weakest
Key is made the weakest

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Decreases
Increases
Remains unchanged
None of these

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Machine Design
Resilience of a material is important, when it is subjected to

Fatigue
Combined loading
Shock loading
Thermal stresses

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