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Machine Design

Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

p.d.σt
(p - d) t.σt
p.t.σt
(p - d) σt

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Machine Design
A chain drive transmits __________ power as compared to belt drive.

More
Same
Less
None of these

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

0.5
0.33
0.55
0.4

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

Decrease
None of these
Increase
Have same value as that of standard specimen

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Machine Design
A screw will be self locking, if

Friction angle is less than helix angle
Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is equal to helix angle

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 8D3n
Gd⁴/ 8D²n
Gd⁴/ 4D3n
Gd3/ 8D3n

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