Chemical Engineering - MCQ Practice Questions

A flat-plate solar collector has a black absorber plate maintained at 80°C. The ambient temperature is 20°C and the heat loss coefficient (overall U value including radiation and convection) is 8 W/(m²·K). For a collector area of 4 m², what is the heat loss rate to the surroundings?

What is the SI unit of thermal conductivity?

In a parallel flow heat exchanger, the temperature approach is minimum at which end?

The Biot number (Bi = hL_c/k) is used to determine which regime of unsteady-state heat conduction?

For laminar flow inside circular tubes, the Nusselt number (Nu) is approximately constant at what value?

A flat plate at 100°C is cooled by air at 25°C. The convection heat transfer coefficient is 50 W/(m²·K). Calculate heat flux if plate area is 2 m².

A condensing steam at 100°C releases latent heat to water inside tubes. This is an example of which type of phase-change heat transfer?

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?

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?

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

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

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

Which pumping principle is used in a gear pump?

A fluid with dynamic viscosity of 0.8 Pa·s and density of 900 kg/m³ flows through a circular pipe. What is the kinematic viscosity of this fluid?

For laminar flow of a viscous fluid between two parallel plates, the velocity profile is:

Which dimensionless number is used to characterize the ratio of inertial forces to viscous forces in fluid flow?

Which of the following pump types operates on the principle of positive displacement with rotating screws?