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Machine Design

Machine Design
Which is positive drive?

Timing belt
Flat belt drive
Crossed belt drive
V belt drive

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Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

d
0.75 d
1.25 d
0.5 d

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Machine Design
The crest diameter of a screw thread is same as

Minor diameter
Core diameter
Major diameter
Pitch diameter

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Machine Design
In a flange coupling, the bolts are subjected to

Compressive stress
Shear stress
Tensile stress
None of these

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Joint may not open up
The resultant load on the bolt would not be affected by the external cyclic load
Bolts are weakest elements
Bolts will not loosen during service

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Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.55
0.4
0.5
0.33

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