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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

20
18
8
12

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Machine Design
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

1.75 d
1.5 d
1 d
1.25 d

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Machine Design
The spring mostly used in gramophones is

Helical spring
Conical spring
Volute spring
Flat spiral spring

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Machine Design
In the assembly of pulley, key and shaft

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

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Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Greater than 30d
Equal to inside diameter of pipe
Between 20d and 30d
Less than 20d

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Machine Design
A universal coupling is used to connect two shafts

Which are perfectly aligned
Which are not in exact alignment
Whose axes intersect at a small angle
Have lateral misalignment

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