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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

NPT (national pipe threads).
Metric
Buttress
Square

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Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Viscosity, speed and bearing pressure
Length, width and speed
Length, width and load
Viscosity, speed and load

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

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

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

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Machine Design
A steel containing 0.8% carbon is known as

Hypo-eutectoid steel
Eutectoid steel
Hypereutectoid steel
None of these

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Machine Design
A saddle key __________ power through frictional resistance only.

Does not transmit
Transmits
None of these
Either A or B

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