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Machine Design

Machine Design
Screws used for power transmission should have

Low efficiency
High efficiency
Very fine threads
Strong teeth

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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

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

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Machine Design
In the levers of first type, the mechanical advantage is ________ one.

Less than
More than
None of these
Equal to

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.2 d
0.8 d
1.57 d
1.8 d

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Machine Design
If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as

b/L
1 - (b/L)
1 - 2 b.L
b/2L

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that the

Difference between the actual size and basic size is 100 mm
Actual size is 100 mm
None of these
Basic size is 100 mm

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