GATE XE 2021 Paper 1 — page 9

Questions 25–27 of 175. Imported answers require review unless explicitly marked reviewed.

Consider the fully-developed flow of a Newtonian fluid (density

; viscosity

) through a smooth pipe of diameter

and length

. The average velocity of the flow is

. If the length of the pipe is doubled, keeping

constant, the friction factor

Your answerChoose one option.

increases by two times

remains the same

decreases by two times

increases by four times

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The absolute value of pressure difference between the inside and outside of a spherical soap bubble of radius,

, and surface tension,

, is:

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which one of the following statements is TRUE about the continuity equation

(where

are the velocity components along the

and

coordinates respectively):

Your answerChoose one option.

The equation is valid only for steady incompressible flows.

The equation is valid for both steady and unsteady incompressible flows.

The equation is valid only for steady compressible flows.

The equation is valid only for unsteady compressible flows.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

2021 · Paper 1