BCE Hydraulics & Fluid Mechanics 2

Question 1

What is the condition for critical flow in an open channel?

Accepted Answer

Fr = 1

Answer

Critical flow occurs when the Froude number equals 1, at which point specific energy is at its minimum for a given discharge.

Question 2

In a pipe network, the Hardy-Cross method is used to solve for which unknown?

Accepted Answer

Flow distribution and head losses

Answer

The Hardy-Cross method is an iterative technique for finding the distribution of flows and head losses that satisfy continuity and energy equations in a pipe network.

Question 3

Which pump type is most commonly used for water supply in civil engineering applications?

Accepted Answer

Centrifugal pump

Answer

Centrifugal pumps are the most widely used in water supply systems due to their simplicity, reliability, and ability to handle large volumes.

Question 4

What phenomenon occurs when pressure in a flowing liquid drops below its vapor pressure?

Accepted Answer

Cavitation

Answer

Cavitation occurs when local pressure falls below the vapor pressure of the liquid, causing formation and collapse of vapor bubbles that can damage pump impellers.

Question 5

The Darcy-Weisbach equation calculates which quantity in pipe flow?

Accepted Answer

Head loss due to friction

Answer

The Darcy-Weisbach equation (hf = f·L/D·V²/2g) calculates the head loss due to friction along a length of pipe.

BCE - Bachelor of Civil Engineering Practice Test

BCE - Bachelor of Civil Engineering Practice Test

BCE Hydraulics & Fluid Mechanics 2