16. What is the ratio of the depth of liquid in the vessel to the diameter of tank (H:D_t)?

A. 1 : 1
B. 2 : 1
C. 4 : 1
D. none of these

17. Radial flow impellers

A. provide high shear conditions for breaking up bubbles
B. direct flow towards the walls of the reactor
C. Both (a) and (b)
D. provide low shear conditions and are suited for use in shear sensitive processes

18. Transient flow range of mixing speed is obtained for

A. Re_i<10
B.10<Re_i<104
C. Re_i=>104
D. None of these

19. A typical ceiling fan would be best described as a(n)

A. radial flow impeller
B. axial flow impeller
C. intermig impeller
D. Rushton turbine

20. What is the ratio of the diameter of impeller to the diameter of tank (D_a:D_t)?

A. 1 : 3
B. 2 : 1
C. 4 : 1
D. 1 : 5