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Machine Design

Machine Design
Guest's theory is used for

Ductile materials
Brittle materials
Plastic materials
Elastic materials

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

P1 + P2
[(√P1 + √P2)/2]²
[⅟₂ × (P1 + P2)] + Pc
⅟₂× (P1 + P2)

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Machine Design
The cold working of metals is carried out __________ the recrystallization temperature.

Above
At
None of these
Below

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Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Acme threads
Multiple threads
Buttress threads
Square threads

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
6 kN/m
24 kN/m
30 kN/m

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Machine Design
For steel, the ultimate strength in shear as compared to ultimate strength in tension is

43834
43833
43864
43832

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