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Machine Design

Machine Design
The spring mostly used in gramophones is

Conical spring
Flat spiral spring
Helical spring
Volute spring

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Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

21
17
25
15

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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

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

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Machine Design
In the assembly of pulley, key and shaft

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

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

Woodruff key
Gib head key
Feather key
Flat saddle key

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Machine Design
The velocity of sliding __________ the distance of the point of contact from the pitch point.

Is equal to cos φ multiplied by
Does not depend upon
Is directly proportional to
Is inversely proportional to

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