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Machine Design

Machine Design
A locking device extensively used in automobile industry is a

Ring nut
Castle nut
Sawn nut
Jam nut

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Machine Design
In the levers of __________ type, the mechanical advantage is less than one.

First
Second
None of these
Third

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

2W/3
W/2
8W/9
W/9

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Machine Design
In the assembly of pulley, key and shaft

Key is made the weakest
Pulley is made the weakest
Key is made the strongest
All the three are designed for equal strength

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

Slotted nut
Castle nut
Hexagonal nut
Any one of the above

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Machine Design
The centre distance between two meshing involute gears is equal to

Sum of pitch circle radii/cosφ
Difference of pitch circle radii/cosφ
Difference of base circle radii/cosφ
Sum of base circle radii/cosφ

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