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Water flows steadily from Channel 1 to Channel 2 in an open-channel system. Both channels are exposed to the atmosphere, and the flow experiences energy losses between the two sections.

Which of the following statements is TRUE according to the Bernoulli equation for open-channel flow?

Answer Choices

A. The pressure head must be included because pressure varies with depth in open channels.

B. The elevation head is measured from the channel bottom at each section.

C. The pressure head at the free surface is zero when using gauge pressure.

D. Energy losses can be neglected if the velocities in both channels are equal.

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Which of the following statements best describes the key difference between ductile and brittle material behavior under increasing load?

A. Ductile materials fail suddenly without warning, whereas brittle materials undergo large plastic deformation before failure.

B. Ductile materials exhibit significant plastic deformation prior to failure, whereas brittle materials fail with little to no plastic deformation.

C. Brittle materials have higher ultimate strength than ductile materials in all loading conditions.

D. Brittle materials always absorb more energy before failure than ductile materials.

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Which of the following statements correctly describes the yield point on a stress–strain curve?

A. It is the point beyond which the material fractures immediately.
B. It is the point up to which stress is directly proportional to strain.
C. It is the point at which the material begins to undergo permanent deformation without a significant increase in stress.
D. It is the maximum stress a material can withstand.

Correct Answer: You tell us

📌 Exam Tip: For the NCESS Organized FE Civil Exam, questions based on the stress–strain curve are commonly asked. At www.roadtofe.com
, we discuss in detail what each point on the curve represents and how to identify the correct answer quickly in the exam.