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Machine Design

Machine Design
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

None of these
Equal to
Less than
Greater than

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

T₁/T₂ =eμθ
log (T₁/T₂) = μθ
T₁/T₂ = μθ
T₁/T₂ = log μθ

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Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

20° full depth involute system
20° stub system
None of these
14½° composite and full depth involute system

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

25 mm
5 mm
15 mm
10 mm

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Machine Design
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

All of these
2 mm for rivet diameter from 39 mm to 48 mm
1 mm for rivet diameter from 27 mm to 36 mm
0.5 mm up to rivet diameter of 24 mm

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Increases
None of these
Decreases
Remains unchanged

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