As per IS 1742:1960 The recommended spacing of manholes on straight reaches lines diameter upto 0.3m spacing 45m, diameter upto 0.60m spacing75m, diameter 0.9m spacing 90m, diameter 1.2m spacing 120m,
diameter 1.5m spacing 150m, greater than 1.5m dia spacing of 300m should be adopted
Question 22
for Gas the viscosity with respect to temperature is given by μ = μ0+ αt
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Question 23
for Gas the viscosity with respect to temperature is given by?
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Question 24
for liquid the viscosity with respect to temperature is given by μ = μ0/(1 + αt + βt²) where μ = viscosity at t° c, μ0 = viscosity of liquid at 0° c, α and β are constants for the liquid, in case of water what are the values μ0,α and β respectively
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Question 25
for liquid the viscosity with respect to temperature is given by
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Question 26
which statement is true
both A and B are true , this is due to reason that the viscous forces in a fluid are due to cohesive forces and molecular momentum transfer. In liquid the cohesive forces predominates the molecular momentum transfer, due to closely packed molecules and with the increase in temperature, the cohesive forces decreases with the result of decreasing viscosity. But in of gases the cohesive forces are small and molecular momentum transfer predominates. With increase in temperature, molecular momentum transfer increase and hence viscosity increases.