Chemical Engineering - MCQ Practice Questions

In a U-tube manometer measuring differential pressure, if one side contains mercury (ρ = 13600 kg/m³) with a height difference of 250 mm, what is the differential pressure?

The relative roughness of a pipe is defined as:

A centrifugal pump operates with water (ρ = 1000 kg/m³) at an impeller diameter of 0.3 m and rotational speed of 1500 RPM. Calculate the peripheral velocity at the impeller tip.

In laminar flow through a circular pipe, the velocity profile is parabolic. What is the ratio of average velocity to maximum velocity at the centerline?

Which dimensionless number characterizes the relative importance of inertial forces to viscous forces in fluid flow?

In a reciprocating pump with piston diameter D = 0.1 m and stroke length L = 0.2 m operating at 60 RPM, calculate the theoretical displacement per revolution.

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?

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

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

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

The Reynolds number for a fluid flow is defined as the ratio of inertial forces to viscous forces. For a pipe flow with diameter 0.05 m, velocity 2 m/s, and kinematic viscosity 1.0×10⁻⁶ m²/s, calculate the Reynolds number.

Which of the following statements about laminar flow in a circular pipe is correct?

A fluid flows through a horizontal pipe of diameter 0.1 m at a velocity of 3 m/s. If the pipe suddenly contracts to 0.05 m diameter, what is the velocity in the contracted section (assuming incompressible flow)?

The friction factor 'f' in the Darcy-Weisbach equation depends on Reynolds number and relative roughness. For laminar flow (Re < 2300), friction factor is given by:

A manometer shows a pressure difference of 50 mm of mercury (ρ_Hg = 13,600 kg/m³). What is the equivalent pressure difference in Pa?

For a fluid flowing over a submerged object, the drag force is given by F_D = ($\frac{1}{2}$)ρV²AC_D. If velocity doubles and drag coefficient remains constant, drag force increases by a factor of: