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Machine Design

Machine Design
The contact ratio for gears is

Zero
Less than one
Greater than one
None of these

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Machine Design
A tube has the following advantage over pipe

Lighter and easier to handle
Smoother inside walls
Greater shock absorption
All of these

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Machine Design
A leaf spring in automobiles is used

To store strain energy
To measure forces
To absorb shocks
To apply forces

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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
2W/3
8W/9
W/2

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Machine Design
A self locking screw has

Course threads
Fine threads
Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin

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Machine Design
The value of Lewis form factor used in design of gears is

Dependent on system of teeth
Independent of size of teeth
All of these
Dependent on number of teeth of a gear

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