Stream lines and path lines always coincide in case of__________________?

Related Mcqs:

1. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?

   A. 22.5 m/sec
   B. 33 m/sec
   C. 40 m/sec
   D. 90 m/sec

2. Ay between two stream lines represents________________?

   A. velocity
   B. discharge
   C. head
   D. pressure

3. 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

4. In a Sutro weir, the discharge is proportional to________________?

   A. H1/2
   B. H3/2
   C. H5/2
   D. H

   where H is head

5. 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

6. In series-pipe problems_______________?

   A. the head loss is same through each pipe
   B. the discharge is same through each pipe
   C. a trial solution is not necessary
   D. the discharge through each pipe is added to obtain total discharge

7. 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

8. 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

9. In a forced vortex motion, the velocity of flow is________________?

   A. directly proportional to its radial distance from axis of rotation
   B. inversely proportional to its radial distance from the axis of rotation
   C. inversely proportional to the square of its radial distance from the axis of rotation
   D. directly proportional to the square of its radial distance from the axis of rotation

10. An ideal fluid is_______________?

    A. one which obeys Newton’s law of viscosity
    B. frictionless and incompressible
    C. very viscous
    D. frictionless and compressible