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Machine Design

Machine Design
If two springs are in parallel then their overall stiffness will be

Half
Double
Same
None of these

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Machine Design
The surface finish factor for a mirror polished material is

0.65
1
0.45
0.85

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

2 kN-m
3 kN-m
1 kN-m
4 kN-m

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Machine Design
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Fullering and caulking
Safety
Ease of manufacture
Reducing stress concentration

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Machine Design
The contact ratio for gears is

None of these
Less than one
Zero
Greater than one

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + sinφ)/ (1 - sinφ)

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