Engineering CAT

In a fluid mechanics system, the Reynolds number is used to predict the type of flow. Which of the following statements is correct regarding the Reynolds number (Re)?

• A) A Reynolds number less than 2000 indicates turbulent flow.

• B) A Reynolds number greater than 4000 indicates laminar flow.

• C) A Reynolds number less than 2000 indicates laminar flow.

• D) A Reynolds number greater than 4000 indicates transitional flow.

In fluid mechanics, what does a Reynolds number between 2000 and 4000 typically indicate?

• D) Steady flow.

• B) Laminar flow.

• A) Turbulent flow.

• C) Transitional flow.

Which of the following factors does NOT affect the Reynolds number in a fluid flow?

• A) Fluid density.

• B) Fluid viscosity.

• C) Flow velocity.

• D) Temperature of the fluid.

In a pipe flow scenario, which of the following statements is true regarding the effect of increasing the diameter of the pipe on the Reynolds number?

• B) Increasing the diameter has no effect on the Reynolds number.

• A) Increasing the diameter decreases the Reynolds number.

• D) Increasing the diameter only affects laminar flow.

• C) Increasing the diameter increases the Reynolds number.

What is the primary significance of the Reynolds number in fluid dynamics?

• B) It indicates the flow regime of the fluid.

• A) It determines the pressure drop in a fluid system.

• D) It calculates the density of the fluid.

• C) It measures the temperature of the fluid.

Which of the following conditions would likely result in a Reynolds number below 2000?

• B) Low flow velocity and high viscosity.

• D) Low temperature and high density.

• C) High temperature and low density.

• A) High flow velocity and low viscosity.

In which scenario would you expect the flow to transition from laminar to turbulent?

• D) When the flow velocity remains constant.

• C) When the fluid viscosity increases significantly.

• A) When the Reynolds number decreases below 2000.

• B) When the Reynolds number increases above 4000.

What is the effect of increasing fluid viscosity on the Reynolds number in a flow system?

• D) It only affects laminar flow conditions.

• A) It increases the Reynolds number.

• B) It decreases the Reynolds number.

• C) It has no effect on the Reynolds number.

In a flow scenario, which of the following would indicate a turbulent flow regime?

• D) Reynolds number of 4500.

• A) Reynolds number of 1500.

• C) Reynolds number of 3500.

• B) Reynolds number of 2500.

Which of the following best describes the relationship between flow velocity and Reynolds number?

• A) Higher flow velocity always results in lower Reynolds number.

• B) Higher flow velocity can lead to higher Reynolds number.

• D) Flow velocity only affects laminar flow conditions.

• C) Flow velocity has no impact on Reynolds number.