The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
(A) 0.423 D
(B) 0.577 D
(C) 0.223 D
(D) 0.707 D
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
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?
(A) 0.223 R
(B) 0.423 R
(C) 0.577 R
(D) 0.707 R
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
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
(A) constant
(B) dependent only on Reynolds number
(C) a function of Reynolds number and relative roughness
(D) dependent on relative roughness only
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?
(A) directly proportional to Reynolds number and independent of pipe wall roughness
(B) directly proportional to pipe wall roughness and independent of Reynolds number
(C) inversely proportional to Reynolds number and indpendent of pipe wall roughness
(D) inversely proportional to Reynolds number and directly proportional to pipe wall roughness
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?
(A) 1/2
(B) 2/3
(C) 3/2
(D) 2
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__________________?
(A) laminar flow
(B) transition flow
(C) turbulent flow
(D) not predictable from the given data
The velocity distribution for laminar flow through a circular tube__________________?
(A) is constant over the cross-section
(B) varies linearly from zero at walls to maximum at centre
(C) varies parabolically with maximum at the centre
(D) none of the above
Equation of continuity is based on the principle of conservation of_________________?
(A) mass
(B) energy
(C) momentum
(D) none of the above