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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

4
8
16
2

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is just sufficient to hold parts together
Approaches yield point
Is about yield point divided by safety factor
Is 50% of yield point

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

P/2.s.l
P/√2.s.l
2P/s.l
√2P/s.l

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Machine Design
The suitable material for belt in agricultural machinery is

Leather
Balata gum
Rubber
Cotton duck

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

Normalizing
Annealing
Spheroidizing
Tempering

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Small overall dimensions
Low starting and low running friction except at very high speeds
Accuracy of shaft alignment
All of these

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