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Machine Design

Machine Design
The constant factor in case of R10 series of preferred numbers is

1.26
1.58
1.12
1.06

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Machine Design
A backing ring is used inside the pipe joint when making a

Sleeve weld
Butt weld
Fillet weld
Socket weld

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

0.1 micron
10 microns
1 micron
0.01 micron

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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

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

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pressure angle
Pitch lead angle
None of these
Helix angle

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Machine Design
Rankine Gordon formula for buckling is valid for

Short and long column
Short column
Very long column
Long column

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