Chemical Engineering - MCQ Practice Questions

Which of the following is the SI unit of kinematic viscosity?

A fluid flows through a pipe of diameter 0.1 m with velocity 2 m/s. If the kinematic viscosity is 1×10⁻⁶ m²/s, calculate the Reynolds number.

Which equation relates pressure drop to velocity in laminar flow through pipes?

For turbulent flow in rough pipes at high Reynolds numbers, which friction factor equation is most applicable?

A centrifugal pump operates at 1500 RPM. If the impeller diameter is 0.3 m, what is the tip speed?

In the Bernoulli equation, which term represents the pressure energy per unit volume?

Water flows through a venturimeter with inlet diameter 0.1 m and throat diameter 0.05 m. The pressure difference is 5 kPa. Assuming ideal flow, calculate the velocity at the inlet (ρ = 1000 kg/m³).

Which type of pump is most suitable for high-head, low-flow applications?

What is the relationship between Fanning friction factor (f) and Darcy friction factor (fD)?

A fluid with dynamic viscosity 0.5 Pa·s and density 800 kg/m³ flows in a pipe. Its kinematic viscosity is:

In a packed bed, if particle diameter increases while maintaining constant bed porosity and superficial velocity, the pressure drop will:

The drag coefficient for a sphere in creeping flow (Re < 0.1) is given by:

A pipeline carries crude oil (μ = 100 cP, ρ = 850 kg/m³) at 1 m/s through a 0.5 m diameter pipe. Determine the flow regime.

Which of the following statements about orifice plates is TRUE?

For a Newtonian fluid, shear stress (τ) is related to shear rate (dV/dy) by:

A pump must deliver 50 m³/h against a total head of 30 m. Calculate the theoretical power required (assuming water, g = 10 m/s²).

In fluid mechanics, which dimensionless number represents the ratio of inertial forces to viscous forces?

For a given pipe and fluid, if the flow velocity doubles, the pressure drop in turbulent flow will approximately:

A manometer shows a mercury height difference of 0.2 m for air flow in a duct. Calculate the pressure difference (ρHg = 13600 kg/m³, g = 10 m/s²).

Which pumping principle is used in a gear pump?