civil engineering MCQs – Page 289

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs

5761. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?
0

A. 1/2

B. 2

C. 2-Mar

D. 3-Feb

5762. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is__________________?
0

A. 27/8

B. 3-Apr

C. 9/4

D. 2-Mar

5763. The pressure at the summit of a syphon is_______________?
0

A. equal to atmospheric

B. more than atmospheric

C. none of the above

D. less than atmospheric

5764. Hot wire anemometer is used to measure_______________?
0

A. pressure intensity of liquid

B. velocity of gas

C. pressure intensity of gas

D. discharge

5765. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?
0

A. 0.25

B. 1.0

C. none of the above

D. 0.5

5766. Flow at constant rate through a tapering pipe is________________?
0

A. non-uniform flow</strong>

B. correct answer is?

C. unsteady flow

D. uniform flow

E. steady flow

5767. Coefficient of contraction for an external cylindrical mouthpiece is_________________?
0

A. 0.7H

B. 1.00

C. 0.611

D. 0.855

5768. Surge wave in a rectangular channel is an example of_________________?
0

A. unsteady flow

B. uniform flow

C. correct answer is?

D. steady flow

E. non-uniform flow</strong>

5769. Equation of continuity is based on the principle of conservation of_________________?
0

A. none of the above

B. mass

C. momentum

D. energy

5770. Which of the following statements is correct ?
0

A. Lower critical Reynolds number is of no practical significance in pipe flow problems.

B. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow

C. Lower critical Reynolds number has the value 2000 in pipe flow

D. Upper critical Reynolds number is significant in pipe flow problems.

5771. The Prartdtl mixing length is_________________?
0

A. maximum at the pipe wall

B. none of the above

C. zero at the pipe wall

D. independent of shear stress

5772. Stanton diagram is a______________?
0

A. semi-log plot of friction factor against Reynolds number

B. semi-log plot of friction factor against relative roughness

C. log-log plot of relative roughness against Reynolds number

D. log-log plot of friction factor against Reynolds number

5773. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?
0

A. 0.20 cm

B. 0.10 cm

C. 0.40 cm

D. 0.05 cm

5774. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?
0

A. 0.577 R

B. 0.223 R

C. 0.423 R

D. 0.707 R

5775. The speed of a pressure wave through a pipe depends upon________________?
0

A. the bulk modulus for the fluid

B. the viscosity of fluid

C. the length of pipe

D. the original head

5776. In which of the following the friction drag is generally larger than pressure drag?
0

A. a sphere

B. an airfoil

C. a circular disc or plate held normal to flow

D. a cylinder

5777. The value of friction factor f for smooth pipes for Reynolds number 106 is approximately equal to________________?
0

A. 0.1

B. 0.01

C. 0.0001

D. 0.001

5778. In series-pipe problems_______________?
0

A. the discharge is same through each pipe

B. a trial solution is not necessary

C. the head loss is same through each pipe

D. the discharge through each pipe is added to obtain total discharge

5779. Pascal-second is the unit of______________?
0

A. pressure

B. dynamic viscosity

C. kinematic viscosity

D. surface tension

5780. An ideal fluid is_______________?
0

A. frictionless and incompressible

B. one which obeys Newtons law of viscosity

C. very viscous

D. frictionless and compressible

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