civil engineering MCQs – Page 291

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 Review each marked answer and report any item that may be outdated or unclear.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

5801. The boundary layer thickness in turbulent flow varies as______________?
0

A. x,/2

B. x7

C. x4/5

D. x3/5

5802. If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?
0

A. from reservoir A to reservoirs B and C

B. from reservoir C to reservoirs A and B

C. from reservoir B to reservoirs C and A

D. unpredictable

5803. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to_______________?
0

A. g

B. g/3

C. g/2

D. 2g/3

5804. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
0

A. 1 m

B. none of the above

C. 10m

D. 100m

5805. A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?
0

A. one-half its value when cylinder was full

B. cannot be predicted from the given data

C. one-fourth its value when cylinder was full

D. zero

5806. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is_______________?
0

A. constant over the cross section

B. parabolic distribution across the section

C. zero at plates and increases linearly to midpoint

D. zero at the mid plane and varies linearly with distance from mid plane

5807. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?
0

A. x/7

B. x

C. x

D. x

5808. Size of a venturimeter is specified by________________?
0

A. pipe diameter

B. throat diameter

C. angle of diverging section

D. both pipe diameter as well as throat diameter

5809. Select the correct statement?
0

A. The friction factor decreases with time

B. The absolute roughness of a pipe de-creases with time

C. A pipe becomes smooth after using for long time

D. The absolute roughness increases with time

5810. The increase in meta centric height_________________?
0

A. increases comfort for passengers

B. decreases comfort for passengers</strong>

C. correct answer is?

D. decreases stability

E. increases stability

5811. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
0

A. a function of Reynolds number and relative roughness

B. constant

C. dependent on relative roughness only

D. dependent only on Reynolds number

5812. Drag force is a function of________________?
0

A. velocity of the body

B. projected area of the body

C. correct answer is ?

D. mass density of the fluid

5813. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
0

A. 1

B. 0.85

C. 0.98

D. 0.611

5814. The losses are more in_________________?
0

A. critical flow

B. turbulent flow

C. transition flow

D. laminar flow

5815. Select the incorrect statement?
0

A. Coefficient of contraction is always less than one

B. Stream lines are parallel throughout the jet at vena contracta

C. The pressure intensity at vena contracta is atmospheric

D. Contraction is least at vena contracta

5816. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?
0

A. d > m > e

B. d > e > m

C. e > d > m

D. e > m > d

5817. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?
0

A. not predictable from the given data

B. laminar flow

C. transition flow

D. turbulent flow

5818. Centre of buoyancy always_________________?
0

A. coincides with the centroid of the volume of fluid displaced

B. remains above the centre of gravity

C. coincides with the centre of gravity

D. remains below the centre of gravity

5819. In case of an airfoil, the separation of flow occurs________________?
0

A. any where between rear and front of body depending upon Reynolds number

B. at the extreme rear of body

C. at the extreme front of body

D. midway between rear and front of body

5820. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?
0

A. 4-Jan

B. 3-Feb

C. 2-Jan

D. 1/3

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