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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

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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

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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

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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

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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

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