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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

More
Same
Less
None of these

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Machine Design
The coefficient of friction in belt drive depends upon

Materials of belt and pulley
Material of pulley
Belt velocity
Material of belt

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Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

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

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Machine Design
The rolling contact bearings are known as

Thin lubricated bearings
Plastic bearings
Antifriction bearings
Thick lubricated bearings

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is 50% of yield point
Approaches yield point
Is about yield point divided by safety factor
Is just sufficient to hold parts together

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Machine Design
In the assembly of pulley, key and shaft

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

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