Fluid Mechanics - Study Mode

[#701] The __________ is measured by a piezometric opening.
Correct Answer

(C) Total pressure

Explanation

Solution: The total pressure is measured by a piezometric opening. This pressure is the sum of the dynamic pressure and the static pressure in a fluid flow. The piezometric opening helps measure the total energy of the fluid, which includes both kinetic and potential energy. Therefore, in this context, the correct option is Option C: Total pressure

[#702] Multistage compressors are used in industry, because they
Correct Answer

(C) Resemble closely to isothermal compression

[#703] Vane anemometer
Correct Answer

(C) Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed

[#704] If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V = fluid velocity f = friction factor).
Correct Answer

(A) Q = Q 1 + Q 2 + Q 3

[#705] Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around
Correct Answer

(D) 1000

Explanation

Solution: Reynolds number (Re) is a dimensionless quantity used in fluid mechanics to predict whether the flow will be laminar or turbulent. It's calculated using this formula: Re = (Density * Velocity * Diameter) / Viscosity For water at room temperature, we can use approximate values: Density (ρ) ≈ 1 g/cm³ Viscosity (μ) ≈ 0.01 g/(cm·s) Let's plug in the given values from the question: Diameter (D) = 2 cm Velocity (V) = 5 cm/s Therefore: Re = (1 g/cm³ * 5 cm/s * 2 cm) / (0.01 g/(cm·s)) Re = 1000 Therefore, the Reynolds number is approximately 1000. This indicates a flow that is likely to be in the transition zone between laminar and turbulent flow.