The wake_______________?

Related Mcqs:

1. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be________________?

   A. 4 kN/m2
   B. 10 kN/m2
   C. 12 kN/m2
   D. 14 kN/m2

2. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is_______________?

   A. 1
   B. 4/3
   C. 2
   D. 4

3. Which of the following is used to measure the discharge ?

   A. current meter
   B. venturimeter
   C. pitot tube
   D. hotwire anemometer

4. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, 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

5. 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__________________?

   A. 0.40 cm
   B. 0.20 cm
   C. 0.10 cm
   D. 0.05 cm

   Assume that boundary layer is entirely laminar

6. Drag force is a function of________________?

   1. projected area of the body
   2. mass density of the fluid
   3. velocity of the body
   The correct answer is ?

   A. (1) and (2)
   B. (1) and (3)
   C. (2) and (3)
   D. (1), (2) and (3)

7. 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

8. Which of the following velocity potentials satisfies continuity equation ?

   A. x2y
   B. x2-y2
   C. cosx
   D. x2 + y2

9. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?

   1. the ball will move to the front
   2. the bubble will move to the front
   3. the ball will move to the rear
   4. the bubble will move to the rear
   Find out which of the above statements are correct ?

   A. (1) and (2)
   B. (1)and(4)
   C. (2) and (3)
   D. (3) and (4)

10. 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__________________?

    A. 0.25
    B. 0.50
    C. 1.0
    D. none of the above