Explore topic-wise MCQs in Bioprocess Engineering Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Bioprocess Engineering Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

Immobilised lactase is used to hydrolyse lactose in dairy waste to glucose and galactose. Enzyme is immobilised in resin particles and packed into a 0.5 m3 column. The total effectiveness factor for the system is close to unity; Km for the immobilised enzyme is 1.32 kg m-3; Vmax is 45 kg m-3 h-1. The lactose concentration in the feed stream is 9.5 kg m-3; a substrate conversion of 98% is required. The column is operated with plug flow for a total of 310 d per year. At what flow rate should the reactor be operated?

A. 1.56 m3 h-1
B. 1.58 m3 h-1
C. 1.50 m3 h-1
D. 1.54 m3 h-1
Answer» B. 1.58 m3 h-1
Discussion
2.

By taking Q10 and at the flow rate of Q10, what is the cell density?

A. 0.42 g l-1
B. 0.44 g l-1
C. 0.46 g l-1
D. 0.48 g l-1
Answer» B. 0.44 g l-1
Discussion
3.

The Zymomonas mobilis cells are used for chemostat culture in a 60 m3 fermenter. The feed contains 12 g l-1 glucose; Ks for the organism is 0.2 g l-1. What flow rate is required for a steady-state substrate concentration of 1.5 g l-1?

A. 15.6 m3 h-1
B. 15.8 m3 h-1
C. 15.4 m3 h-1
D. 15.2 m3 h-1
Answer» B. 15.8 m3 h-1
Discussion
4.

Zymomonas mobilis is used to convert glucose to ethanol in a batch fermenter under anaerobic conditions. The yield of biomass from substrate is 0.06 g g-1; YPX is 7.7 g g-1. The maintenance coefficient is 2.2 g g-1 h-1; the specific rate of product formation due to maintenance is 1.1 h-1. The maximum specific growth rate of Z. mobilis is approximately 0.3 h-1.5 g bacteria are inoculated into 50 litres of medium containing 12 g l-1 glucose. Determine batch culture times required to produce 10 g biomass.

A. 3.1 h
B. 3.3 h
C. 3.5 h
D. 3.7 h
Answer» E.
Discussion
5.

Convert vmax = 7 mmol m-3 s-1 into mM h-1.

A. 25
B. 20
C. 25.20
D. 20.25
Answer» D. 20.25
Discussion
6.

Convert vmax = 2.5 mmol m-3 s-1 into mM h-1.

A. 2500
B. 900
C. 25
D. 9
Answer» E.
Discussion