Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer
Q. Which of the following has highest coefficient of discharge ?
a. sharp edged orifice
b. venturimeter
c. Borda’s mouthpiece running full
d. CipoUetti weir
Q. In a Sutro weir, the discharge is proportional to (where H is head.)
a. H1/2
b. H3/2
c. H5/2
d. H
Q. The discharge over a broad crested weir is maximum when the depth of (where H is the available head.)flow is
a. H/3
b. H/2
c. 2 H/5
d. 2 H/3
Q. Which of the following statements is correct?
a. Lower critical Reynolds number is of no practical significance in pipe flow problems.
b. Upper critical Reynolds number is significant in pipe flow problems.
c. Lower critical Reynolds number has the value 2000 in pipe flow
d. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
Q. The shear stress distribution for a fluid flowing in between the parallelplates, both at rest, is
a. constant over the cross section
b. parabolic distribution across the section
c. zero at the mid plane and varies linearly with distance from mid plane
d. zero at plates and increases linearly to midpoint
Q. Stanton diagram is a
a. log-log plot of friction factor against Reynolds number
b. log-log plot of relative roughness against Reynolds number
c. semi-log plot of friction factor against Reynolds number
d. semi-log plot of friction factor against relative roughness
Q. The boundary layer thickness in turbulent flow varies as (where x is the distance from leading edge.)
a. x”7
b. x,/2
c. x4/5
d. x3/5
Q. The distance y from pipe boundary, at which the point velocity is equal toaverage velocity for turbulent flow, is (where R is radius of pipe.)
a. 0.223 R
b. 0.423 R
c. 0.577 R
d. 0.707 R
Q. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is
a. less than 1
b. between 1 and 100
c. 160
d. 200
Q. In case of an airfoil, the separation of flow occurs
a. at the extreme rear of body
b. at the extreme front of body
c. midway between rear and front of body
d. any where between rear and front of body depending upon Reynolds number
Q. When an ideal fluid flows past a sphere,
a. highest intensity of pressure occurs around the circumference at right angles to flow
b. lowest pressure intensity occurs at front stagnation point
c. lowest pressure intensity occurs at rear stagnation point
d. total drag is zero
Q. With the same cross-sectional area and immersed in same turbulent flow,the largest total drag will be on
a. a circular disc of plate held normal to flow
b. a sphere
c. a cylinder
d. a streamlined body