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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Pt /P
Ps /P
Pc /P
Least of Pt, Ps and Pc/P

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Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.2
0.5
0.6
0.25

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Machine Design
The shock resistance of steel is increased by adding

Cobalt and molybdenum
Chromium
Nickel and chromium
Nickel

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Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2 d
1.2 d
1.6 d
2.5 d

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Decrease with decrease in y
Be independent of ratio of mass of load W to mass of bar (y)
Increase with increase in y
Depend on other considerations

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Machine Design
The application of second type levers is found in

Lever of a loaded safety valve
Handle of a hand pump
A pair of tongs
Hand wheel of a punching press

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