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Machine Design

Machine Design
Ball bearing type screws are found in following application

Crane
Screw jack
Steering mechanism
Aeroplane engines

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Machine Design
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

2.5 d
1.5 d
1 d
2 d

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

T₁ - T₂ + Tc
T₁ + T₂ + Tc
(T₁ - T₂ + Tc)/2
(T₁ + T₂ + Tc)/2

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Machine Design
In radial cams, the follower moves

In a direction perpendicular to the cam axis
In any direction irrespective of cam axis
Along the cam axis
In a direction parallel to the cam axis

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.35 to 0.45%
None of these
0.20 to 0.40%
0.40 to 0.60%

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Machine Design
The square threads are usually found on

Screw cutting lathes
Spindles of bench vices
Feed mechanism of machine tools
Railway carriage couplings

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