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Machine Design

Machine Design
The most important dimension in the design of a nut is

Outside diameter
Inside diameter
Pitch diameter
Height

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

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Machine Design
If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as

1 - 2 b.L
b/2L
1 - (b/L)
b/L

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Machine Design
The crest diameter of a screw thread is same as

Pitch diameter
Minor diameter
Major diameter
Core diameter

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

More than 50%
None of these
Less than 50%
Equal to 50%

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force)

Pc/3
3 Pc
2 Pc
1 Pc

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