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Machine Design

Machine Design
Screws used for power transmission should have

Strong teeth
Very fine threads
Low efficiency
High efficiency

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Machine Design
The rated life of a bearing varies

Inversely as square of load
Directly as load
Inversely as cube of load
Inversely as fourth power of load

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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

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

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

Double
Same
One-half
One-fourth

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

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

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Machine Design
The resilience of a bolt may be increased by

Increasing its length
Increasing its shank diameter
Decreasing its shank diameter
Decreasing its length

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