Chemical Engineering - MCQ Practice Questions

A fluid flows through a circular pipe of diameter 50 mm at a velocity of 2 m/s. If the kinematic viscosity is 1×10⁻⁵ m²/s, calculate the Reynolds number and identify the flow regime.

Which of the following dimensionless numbers represents the ratio of inertial forces to viscous forces in fluid flow?

In a horizontal pipe flow, the pressure drop increases with which of the following factors?

A centrifugal pump has an impeller diameter of 0.3 m rotating at 1500 RPM. Calculate the peripheral speed of the impeller tip.

The net positive suction head (NPSH) available is 4.5 m and NPSH required is 3.2 m for a pump. What can be concluded?

For laminar flow in a circular pipe, the velocity profile is parabolic. What is the relationship between maximum velocity (V_max) and average velocity (V_avg)?

A pitot tube is used for velocity measurement. If the stagnation pressure is 101.5 kPa and static pressure is 100.2 kPa, calculate the fluid velocity (ρ = 1.2 kg/m³).

In a pump, the head developed is 50 m and flow rate is 100 L/s. Calculate the hydraulic power. (Take g = 9.81 m/s²)

Which pump characteristic curve represents the relationship between head and flow rate?

For a turbulent pipe flow with friction factor f = 0.032, pipe diameter D = 0.1 m, and velocity V = 3 m/s over length L = 50 m, calculate pressure drop using Darcy-Weisbach equation.

A fluid with density 800 kg/m³ flows through an orifice plate. If pressure drop across orifice is 50 kPa, what is the fluid velocity? (C_d = 0.61, Area ratio β = 0.5)

In compressible flow through a nozzle, sonic or critical conditions occur when Mach number equals:

A boundary layer develops on a flat plate immersed in a flowing fluid. Which of the following correctly describes boundary layer separation?

For an open channel with trapezoidal cross-section, which parameter is used to determine the wetted perimeter?

A sharp-crested weir has a crest length of 2.0 m. If the head over weir is 0.4 m, calculate the discharge using Francis formula. (Use C_d = 0.623)

In a converging-diverging nozzle, if pressure increases in the diverging section, what type of flow pattern occurs?

A vertical cylindrical settling tank has diameter 3 m and height 4 m. For a particle settling velocity of 2 cm/min, what should be the volumetric flow rate to achieve 90% removal efficiency?

The Blasius equation for friction factor in turbulent flow is valid for:

A pump operating at 1200 RPM delivers 150 L/s against a head of 40 m. If speed increases to 1800 RPM, what will be the new head (assuming affinity laws apply)?

In a fluid flow system, which of the following best represents the Bernoulli equation?