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Machine Design

Machine Design
Which is positive drive?

Flat belt drive
V belt drive
Timing belt
Crossed belt drive

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

25 mm
10 mm
15 mm
5 mm

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Machine Design
Gear box is used

For speed reduction
To obtain variable speeds
To produce torque
To increase efficiency of system

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Machine Design
The rated life of a bearing varies

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

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Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Flat saddle key
Feather key
Gib head key
Woodruff key

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Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Light series whose bore is 25 mm
Medium series whose bore is 25 mm
Light series whose bore is 5 mm
Medium series whose bore is 5 mm

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