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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Brass
Mild steel
Aluminium
Cast iron

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

3 to 5
5 to 10
0.5 to 1
1 to 2

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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 value of frictional torque
Reduce the effort needed for lifting the working load

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

Same in both cases
4 times more
3 times more
2 times more

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Increases
Decreases
None of these
Remains unchanged

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Machine Design
The V-belts are particularly suitable for __________ drives.

Short
Both A and B
None of these
Long

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