Question

PLEASE HELP ME WITH MCQS

Registration No. Time: 30 mins. Course MEG 301 Semester EM 20 Date SECTION "A 120 Q. 1 - 20 marks] Tick and fill in the bla k and fill in the blank if required the most appropriate answer 1. The centre of buoyancy of a submerged body 1 1 coincides with the centre of gravity of the body I coincides with the centroid of the displaced volume of the body 1 ) is always below the centre of gravity of the body is always above the centroid of the displaced volume of liquid 2 A pathlines means direction of a number of particles at the same instant of time () instantaneous picture of positions of all particles in the flow that passed a given point [trace made by a single particle over a period of time path traced by continuously injected tracer at a point ye ake 3. If a stream function exists it means that I the function represents a possible flow field the flow is steady, incompressible [] the function represents I the flow is irrotational [ ] the potential function also exists 4. To reduce the separation, a commonly used boundary layer control method is use of suction of accelerating fluid within the boundary layer using large divergence angles in the boundary use of suction of retarded fluid within the boundary layer () use of smooth boundaries 5. The laminar sub-layer exists [] only in laminar boundary layers-- () in all turbulent boundary layers only in smooth turbulent boundary layers [] only in rough fully developed turbulent boundary layers 6. The sonic velocity is largest in [] Steel [ ] Air [ ] Kerosene [ 1 Water 1. A convergent- divergent nozzle is used when the discharge pressure is equal to critical pressure [ ] more than critical pressure Llless than critical pressure [ ] equal to the back pressure & Which of the following wich of the following bends will cause maximum head loss? 130 hend 1160 bend 90. bend [ ]U-bend 9. In a force vortex, maimun e Vortex the velocity of flow everywhere within the trud is [ ] minimum ( ) non-zero finite [] zero

Answer 1

1. The center of buoyancy for submerged body coincides with center of gravity of body.

2. A pathline means trace made by a single particle over period of time.  

3. If a stream function exist it means that the flow is irrotational.

4. To reduce the sseparation, a commonly used boundary layer control method is use of suction of retarded fluid within the boundary layer.

5. The laminar sub-layer exist only in smooth turbulent boundary layers.

6. The sonic velocity is largest in steel.

7. A convergent-divergent nozzle is used when the discharge pressure is less than critical pressure.

8. U bend will cause maximum head loss.

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