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Machine Design

Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

3-15 m/s
1-3 m/s
15-30 m/s
30-50 m/s

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Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Combined tensile and shear stress
Tensile stress
Any one of these
Shear stress

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Machine Design
The property of a material which enables it to resist fracture due to high impact loads is known as

Toughness
Elasticity
Endurance
Strength

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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
W/9
2W/3
W/2

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

Z/pN
ZN/p
p/ZN
N/Zp

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Machine Design
The acme threads are usually found on

Railway carriage couplings
Feed mechanism of machine tools
Screw cutting lathes
Spindles of bench vices

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