Hydraulics & Fluid Mechanics Mcqs - Set 9

1)   Non uniform flow occurs when ____________________?

a. the direction and magnitude of the velocity at all points are identical
b. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
c. the magnitude aricf direction of the velocity do not change from point to point in the fluid
d. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
e. velocity, depth, pressure, etc. change from point to point in the fluid flow
Answer  Explanation 

ANSWER: velocity, depth, pressure, etc. change from point to point in the fluid flow

Explanation:
No explanation is available for this question!


2)   An ideal flow of any fluid must satisfy ___________________?

a. Pascal law
b. Newton’s law of viscosity
c. boundary layer theory
d. continuity equation
e. Bernoulli’s theorem
Answer  Explanation 

ANSWER: continuity equation

Explanation:
No explanation is available for this question!


3)   For measuring flow by a venturimeter, if should be installed in__________________?

a. vertical line
b. horizontal line
c. inclined line with flow downward
d. inclined line with upward flow
e. in any direction and in any location
Answer  Explanation 

ANSWER: in any direction and in any location

Explanation:
No explanation is available for this question!


4)   Uniform flow occurs when____________________?

a. the flow is steady
b. the flow is streamline
c. size and shape of the cross section in a particular length remain constant
d. size and cross section change uniform¬ly along length
e. flow occurs at constant fate
Answer  Explanation 

ANSWER: size and shape of the cross section in a particular length remain constant

Explanation:
No explanation is available for this question!


5)   Steady flow occurs when____________________?

a. the direction and magnitude of the velocity at all points are identical
b. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
c. the magnitude and direction of the velocity do not change from point to point in the fluid
d. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
e. velocity, depth, pressure, etc. change from point to point in the fluid flow
Answer  Explanation 

ANSWER: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

Explanation:
No explanation is available for this question!


6)   The flow in which each liquid particle has a definite path and their paths do not cross each other is called____________________?

a. one dimensional flow
b. uniform flow
c. steady flow
d. turbulent flow
e. streamline flow
Answer  Explanation 

ANSWER: streamline flow

Explanation:
No explanation is available for this question!


7)   The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as___________________?

a. one dimensional flow
b. uniform flow
c. steady flow
d. turbulent flow
e. streamline flow
Answer  Explanation 

ANSWER: uniform flow

Explanation:
No explanation is available for this question!


8)   Flow occurring in a pipeline when a valve is being opened is ______________________?

a. steady
b. unsteady
c. laminar
d. vortex
e. rotational
Answer  Explanation 

ANSWER: unsteady

Explanation:
No explanation is available for this question!


9)   The flow in which conditions do not change with time at any point, is known as _____________________?

a. one dimensional flow
b. uniform flow
c. steady flow
d. turbulent flow
e. streamline flow
Answer  Explanation 

ANSWER: steady flow

Explanation:
No explanation is available for this question!


10)   The flow which neglects changes in a transverse direction is known as ____________________?

a. one dimensional flow
b. uniform flow
c. steady flow
d. turbulent flow
e. streamline flow
Answer  Explanation 

ANSWER: one dimensional flow

Explanation:
No explanation is available for this question!


11)   The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as_________________?

a. one dimensional flow
b. uniform flow
c. steady flow
d. turbulent flow
e. streamline flow
Answer  Explanation 

ANSWER: turbulent flow

Explanation:
No explanation is available for this question!


12)   General energy equation holds for_________________?

a. steady flow
b. turbulent flow
c. laminar flow
d. non-uniform flow
e. all of the above
Answer  Explanation 

ANSWER: non-uniform flow

Explanation:
No explanation is available for this question!


13)   A streamline is defined as the line ________________?

a. parallel to central axis flow
b. parallel to outer surface of pipe
c. of equal yelocity in a flow
d. along which the pressure drop is uniform
e. which occurs in all flows
Answer  Explanation 

ANSWER: of equal yelocity in a flow

Explanation:
No explanation is available for this question!


14)   A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

a. 0.5
b. 0.4
c. 0.515
d. 0.5
e. none of the above
Answer  Explanation 

ANSWER: 0.515

Explanation:
No explanation is available for this question!


15)   The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?

a. head of water (h)
b. h2
c. V/T
d. h2
e. h3/1.
Answer  Explanation 

ANSWER: V/T

Explanation:
No explanation is available for this question!


16)   In a free vortex motion, the radial component of velocity everywhere is ________________?

a. maximum
b. minimum
c. zero
d. non-zero and finite
e. unpredictable
Answer  Explanation 

ANSWER: zero

Explanation:
No explanation is available for this question!


17)   A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is__________________?

a. 0.83
b. 0.6
c. 0.4
d. 0.3
e. none of the above
Answer  Explanation 

ANSWER: 0.6

Explanation:
No explanation is available for this question!


18)   The region between the separation streamline and the boundary surface of the solid body is known as_________________?

a. wake
b. drag
c. lift
d. boundary layer
e. aerofoil section
Answer  Explanation 

ANSWER: wake

Explanation:
No explanation is available for this question!


19)   The upper surface of a weir over which water flows is known is________________?

a. crest
b. nappe
c. sill
d. weir top
e. contracta
Answer  Explanation 

ANSWER: sill

Explanation:
No explanation is available for this question!


20)   Uniform flow occurs when___________________?

a. the direction and magnitude of the velocity at all points are identical
b. the velocity of successive fluid pai-ticles, at any point, is the same at suc¬cessive periods of time
c. the magnitude and direction of the velocity do not change from point to point in the fluid
d. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plsr.e
e. velocity, depth, pressure, etc. change from point to point in the fluid flow
Answer  Explanation 

ANSWER: the magnitude and direction of the velocity do not change from point to point in the fluid

Explanation:
No explanation is available for this question!