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Machine Design

Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Heavier
None of these
Lighter
Moderate

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/σt
pd/2σt
pd/4σt
pd/3σt

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-third
One-half
Double
One-fourth

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Machine Design
The ball bearings are, usually, made from

High speed steel
Medium carbon steel
High carbon steel
Low carbon steel

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Machine Design
Lewis equation is applied

Only to the pinion
To stronger of the pinion or gear
To weaker of the pinion or gear
Only to the gear

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Machine Design
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a

Medium bearing
Long bearing
Square bearing
Short bearing

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