Chemical Engineering - MCQ Practice Questions

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?

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).

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).

For incompressible flow through a converging nozzle, if the inlet area is 4 times the outlet area and inlet velocity is 5 m/s, the outlet velocity will be:

A centrifugal pump delivers 30 m³/h of water. The inlet pressure is -0.2 bar (gauge) and outlet pressure is 8 bar (gauge). If the outlet is 2m higher than inlet, calculate the total head in meters. (Consider g = 9.81 m/s², ρ = 1000 kg/m³)

For a sharp-edged orifice, the coefficient of contraction (Cc) typically ranges between:

In the Hagen-Poiseuille equation for laminar flow through a circular pipe, the volumetric flow rate is proportional to:

A ball of diameter 5 cm falls through glycerin at terminal velocity. If the Stokes drag coefficient Cd is used, this indicates:

The Darcy-Weisbach equation relates friction loss to flow parameters. The friction factor f for turbulent flow in smooth pipes is given by:

For flow over a flat plate, the drag force depends on velocity according to:

In a siphon arrangement, what is the maximum theoretical height from which water can be siphoned up using atmospheric pressure?

For a venturimeter operating with water flow, the pressure at the throat is found to be lower than upstream. This pressure drop is used to:

In a pitot tube application, the stagnation point pressure exceeds static pressure by an amount equal to:

For a long horizontal pipeline with incompressible fluid, the pressure loss due to friction increases when:

In turbulent flow through a pipe, the friction factor can be estimated using the Colebrook-White equation. For smooth pipes at high Reynolds numbers, which equation applies?

A fluid flows through a sudden expansion from pipe diameter D₁ = 0.05 m to D₂ = 0.1 m with velocity V₁ = 4 m/s. Calculate the pressure recovery coefficient (Cp) for the expansion.

In an orifice meter with diameter ratio β = 0.6, what is the typical discharge coefficient (Cd) used for flow calculations?

A rotameter (variable area flowmeter) is used for gas flow measurement. The float rise in the tube depends on which factor?