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Machine Design

Machine Design
If a spring is cut down into two springs, the stiffness of cut springs will be

Double
None of these
Half
Same

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

3.5d
2d + 20 mm
d + 17 mm
2d + 13 mm

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

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Machine Design
The shock absorbing capacity of a bolt may be increased by

Making the shank diameter equal to core diameter of thread
Increasing its shank diameter
Tightening the bolt properly
Decreasing its shank diameter

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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 + sinφ)
(1 - sinφ)/ (1 + cosφ)

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Cold working
Hot working
Shot peening
Grinding and lapping surface

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