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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Brass
Cast iron
Mild steel
Aluminium

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Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
More
None of these
Less

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

0.75/ (0.75 + √v)
4.5/ (4.5 + v)
6/ (6 + v)
3/ (3 + v)

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Machine Design
For tight leakage joints, following type of thread is best suited

NPT (national pipe threads).
Metric
Buttress
Square

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Machine Design
The following type of nut is used with alien bolt

Hexagonal nut
Castle nut
Slotted nut
Any one of the above

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.5
0.65
0.2
0.35

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