GATE CH 2023 Paper 1 — page 10

Questions 28–30 of 65. Imported answers require review unless explicitly marked reviewed.

Consider a system where a Carnot engine is operating between a source and a sink. Which of the following statements about this system is/are NOT correct?

Your answerSelect all correct options. You can choose more than one.

This engine is reversible.

The engine efficiency is independent of the source and sink temperatures.

This engine has the highest efficiency among all engines that operate between the same source and sink.

The total entropy of this system increases at the completion of each cycle of the engine.

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For a fully developed turbulent flow of an incompressible Newtonian fluid through a pipe of constant diameter, which of the following statements is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

Reynolds stress, averaged over a sufficiently long time, is zero everywhere inside the pipe.

Reynolds stress at the pipe wall is zero.

Average velocity of the fluid is half of its center-line velocity.

Average pressure gradient in the flow direction is constant.

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Given that

(in W·m

) is the total hemispherical emissive power of a surface maintained at a certain temperature, which of the following statements is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

does not depend on the direction of the emission.

depends on the viewer.

depends on the wavelength of the emission.

does not depend on the frequency of the emission.

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2023 · Paper 1

Question 28

Question 29

Question 30