26. A chemostat has a liquid volume of 2 liters and is being fed at a rate of 4 liters per hour. The dilution rate for this reactor will be
A. 2 liters
B. 2 liters per hour
C. 2 h-1
D. 4 liters per hour

27. Mixing per unit volume is observed to be poorest in

A. continuous packed bed reactor
B. continuous fluidized bed bioreactor
C. continuous airlift bioreactor
D. none of the above

28. The growth of an organism on glucose is described by the following Monod model parameters: μm = 0.5 h^-1 and Ks =0.1 g.l^-1, if the concentration of glucose in the feed is 10 g.l^-1and the dilution rate is set to 0.4 h^-1, then the steady-state concentration of glucose in the effluent will be

A. 0 g.l^-1
B. 0.5 g.l^-1
C. 1.0 g.l^-1
D. 10 g.l^-1

29. A continuous reactor at steady state contains 0.04 g.l^-1 of biomass and 0.02 g.l^-1 of phenol. The feed contained 0.1 g.l^-1 of phenol. The biomass yield would be

A. 0.4 g.g^-1
B. 0.5 g.g^-1
C. 1.0 g.g^-1
D. 5.0 g.g^-1

30. A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.

A. continuous
B. batch
C. fed-batch
D. semi-continuous