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Machine Design

Machine Design
The railway carriage couplings have

Acme threads
Buttress threads
Knuckle threads
Square threads

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Decreases
Increases
None of these
Remains unchanged

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Machine Design
In cylindrical cams, the follower moves

Along the cam axis
In any direction irrespective of cam axis
In a direction parallel to the cam axis
In a direction perpendicular to the cam axis

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Machine Design
Yield point in fatigue loading as compared to static loading is

Lower
Same
Depends on other factors
Higher

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

5 N-m
7 N-m
10 N-m
15 N-m

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Machine Design
A screw will be self locking, if

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

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