MACHINE DESIGN QUIZ

Lewis equation in gears is used to find the

Tensile stress in bending

Fatigue stress

Compressive stress in bending

Shear stress

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When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Initial tension or external load, whichever is greater

Initial tension

External load applied

Sum of the initial tension and external load applied

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The resilience of a bolt may be increased by

Decreasing its length

Increasing its length

Increasing its shank diameter

Decreasing its shank diameter

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YOUR ANSWER : ?

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

Bolts will not loosen during service

The resultant load on the bolt would not be affected by the external cyclic load

Bolts are weakest elements

Joint may not open up

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The process extensively used for making bolts and nuts is

Extrusion

Hot piercing

Cold heading

Cold peening

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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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When a bolt is subjected to an external load, the stress induced in the bolt will be

Tensile stress

Any one of these

Combined tensile and shear stress

Shear stress

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A transmission shaft includes

Line shaft

Over head shaft

Counter shaft

All of these

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A backing ring is used inside the pipe joint when making a

Socket weld

Fillet weld

Butt weld

Sleeve weld

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Which of the following is not correct procedure to increase the fatigue limit?

Surface decarburisation

Cold working

Shot peening

Under stressing

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