20801. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
20802. Population doubling time, td can be expressed as (where μ is the specific growth rate.)
20803. A higher Ks value of Monod's equation means
20804. The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
20805. Which of the following is correct for the prediction of time requirement in a batch fermenter?
20806. In an airlift bioreactor, the spent gases released from the liquid are called
20807. The contents in jet loop reactor are mixed through
20808. The specific growth rate (μ) is defined as
20809. The number of baffles in a standard stirred tank bioreactor is
20810. In the stationary phase
20811. Which of the following is an example of a mathematical model?
20812. Biomass concentrations during fermentation is
20813. Chemostats work on the principle of
20814. During the exponential phase the maximum specific growth rate equals specific growth rate as
20815. An internal draft tube is preferrred to an external draft tube because
20816. A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in
20817. The optical density sometimes drops during the lag phase because
20818. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
20819. Residence time distribution (RTD) of a reactor is independent of
20820. The bubble column fermenter is usually limited to
20821. A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture.
20822. If the specific growth rate, μ. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as
20823. The diameter of the baffles in a standard stirred tank bioreactor ranges from
20824. During the log phase cell numbers increase exponentially
20825. Lag phase occurs mainly due to
20826. In a batch reactor specific growth rate
20827. Turbidostat is recommended when continuous fermentation needs to be carried out at
20828. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
20829. Stirred tank fermenter (STF) can be employed for
20830. The specific growth rate is affected by
20831. The main function(s) of a draft tube in an air lift fermenter is/are to
20832. Which of the following is incorrect?
20833. The contents in bubble column and air lift reactor are mixed through
20834. Which of the following statements would be appropriate while comparing bubble column and air lift fermenter of the same size?
20835. During the lag phase
20836. Concentration of the growth limiting substrate means
20837. Tower fermentors are used for
20838. In wastewater treatment, which bioreactor is generally used?
20839. The contents in stirred tank rector are mixed through
20840. The height to diameter ratio (H/D) for the tank fermenters is
20841. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
20842. In an airlift bioreactor, the air sparging region is called
20843. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
20844. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the
20845. Which of the following(s) is/are considered the limitations of the exponential growth model?
20846. To describe components of an airlift bioreactor which of the follow-ings are generally included?
20847. The function of the disengagement zone in an airlift fermenter is to
20848. Stationary phase is described as
20849. In the accelerated phase, cell starts to
20850. The monod model predicts that the specific growth rate
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