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Machine Design

Machine Design
For maximum power, the velocity of the belt will be

√(T/2m)
√(T/m)
None of these
√(T/3m)

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Machine Design
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Maximum compressive strength is 200 N/mm²
Carbon content is 2%
Maximum shear strength is 200 N/mm²
Minimum tensile strength is 200 N/mm²

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Decreasing the cross-section area of bar
Remain unaffected with cross-section area
Increasing the cross-section area of bar
Would depend upon other factors

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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

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

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.2
0.5
0.65
0.35

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Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

1 micron
0.1 micron
0.01 micron
10 microns

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