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Machine Design

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

Same
Half
None of these
Double

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Enhance the load carrying capacity of the jack
Reduce the value of frictional torque
Prevent the rotation of load being lifted
Reduce the effort needed for lifting the working load

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Machine Design
A screw is said to be over hauling screw, if the

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

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

None of these
Both the shafts are equally good
Shaft B is better than shaft A
Shaft A is better than shaft B

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Machine Design
A riveted joint is a __________ fastening.

None of these
Permanent
Temporary
Either A or B

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Machine Design
The ball bearings are, usually, made from

High speed steel
Medium carbon steel
Low carbon steel
High carbon steel

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