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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

45°
22.5°
67.5°
90°

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Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrostatic lubricated bearing
Boundary lubricated bearing
Zero film bearing
Hydrodynamic lubricated bearing

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Machine Design
Antifriction bearings are

Hydrodynamic bearings
Thin lubricated bearings
None of these
Sleeve bearings

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

(1/2) × [σ + √(σ² × 4τ²)]
(1/2) × √(σ² × 4τ²)
σ + √(σ² × 4τ²)
√(σ² × 4τ²)

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Machine Design
The belt slip occurs due to

Any one of the above
Loose belt
Driving pulley too small
Heavy load

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Machine Design
Which of the following statement is correct for gears?

The pitch circle is always greater than the base circle
The addendum is less than dedendum
All of these
The pitch circle diameter is equal to the product of module and number of teeth

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