Which combination of the following statements about steady incompressible forced vortex flow is correct? P: Shear stress is zero at all points in the flow. Q: Vorticity is zero at all points in the flow. R: Velocity is directly proportional to the radius from the centre of the vortex. S: Total mechanical energy per unit mass is constant in the entire flow field. Select the correct answer using the codes given below:

Which combination of the following statements about steady incompressi

1.	Which combination of the following statements about steady incompressible forced vortex flow is correct? P: Shear stress is zero at all points in the flow. Q: Vorticity is zero at all points in the flow. R: Velocity is directly proportional to the radius from the centre of the vortex. S: Total mechanical energy per unit mass is constant in the entire flow field. Select the correct answer using the codes given below:
A.	P and Q
B.	R and S
C.	P and R
D.	P and S
Answer» C. P and R

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