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Machine Design

Machine Design
Ball bearing type screws are found in following application

Aeroplane engines
Steering mechanism
Crane
Screw jack

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Machine Design
The size of a cam depends upon

Pitch curve
Pitch circle
Base circle
Prime circle

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Machine Design
Shaft coupling is used in machinery to

All of these
Introduce protection against over loads
Reduce the transmission of shock loads
Introduce mechanical flexibility

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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
None of these
Remains unchanged

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Machine Design
Idler pulley is used for

Changing the direction of motion of belt
For applying tension
Increasing velocity ratio
All 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 (according to Barth) will be equal to (Where, Pc is centrifugal tension)

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

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