Fermentation Technology Questions and Answers – Instrumentation and Control – Online Analysis of Other Chemical Factors

This set of Fermentation Technology Questions and Answers for Experienced people focuses on “Instrumentation and Control – Online Analysis of Other Chemical Factors”.

1. Which of the following organization developed Ion-specific sensors?
a) Orion Research
b) AISI
c) TATA
d) SAIL
View Answer

Answer: a
Explanation: The Ion-specific sensors were developed by Orion Research and Radiometer to measure the ions. Orion is a research-based biotechnology institute in the USA.

2. The minimum response time of Ion-selective electrodes is ________
a) 10 secs
b) 15 secs
c) 5 secs
d) 20 secs
View Answer

Answer: a
Explanation: The minimum response of ion-selective electrode is 10 seconds. It is used to measure NH4+, K+, SO2, etc. in the composition of the sample. The response time depends on the concentration of ion species in the sample.

3. Who developed the sterilized penicillinase electrodes?
a) Higgins
b) Hewetson
c) Boldot
d) Enfors
View Answer

Answer: b
Explanation: Hewetson et al. in 1979 prepared sterilized penicillinase electrodes. He assembled sterile components or by standing assembled components in chloroform before placing them in the fermenter.
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4. Who developed the technique to measure glucose in a lactic acid fermentation?
a) Brookes
b) Vaccari
c) Rolf
d) Lim
View Answer

Answer: b
Explanation: Vaccari et al. in 1994 used the technique to measure glucose, lactic acid, and biomass in a lactic acid fermentation. NIR was also used to measure alkaline protease production in broths.

5. The minimum response time of mass spectroscopy is __________
a) 15 secs
b) 10 secs
c) 5 secs
d) 2 secs
View Answer

Answer: c
Explanation: The mass spectroscopy has the response time of fewer than 5 seconds for a full-scale response and taking about 12 seconds for a sample stream. It allows the monitoring of the partial pressure of gases.

6. Which of the following is not a component of the control loop?
a) Initial control element
b) A measuring element
c) Final control element
d) Controller
View Answer

Answer: a
Explanation: The components of the control loop include: a measuring element, a controller, a final control element, and the process to be controlled. It senses the properties such as flow, pressure, temperature, etc.

7. Which of the following is not a type of Automatic control system?
a) Integral controls
b) Derivative controls
c) Proportional controls
d) Displacement control
View Answer

Answer: d
Explanation: Automatic controls are classified into four types: Integral controls, Derivatives controls, Proportional controls, Two-position controls. Displacement is not a type of control.
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8. The manual control consists of ___________ to regulate the temperature.
a) Safety valve
b) Needle valve
c) Butterfly valve
d) Steam valve
View Answer

Answer: d
Explanation: The example of control is manual control which consists of steam valves to regulate the temperature of the water flowing through the pipe. It also corrects the temperature deviation.

9. The change in the output of the controller is proportional to the input signal produced by the environmental change.
a) True
b) False
View Answer

Answer: a
Explanation: The proportional control is explained as the change in the output of the controller is proportional to the input signal produced by the environmental change. This is commonly referred to as an error which is detected by a sensor.
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10. Which of the following combination of control is not used in practice?
a) Proportional plus integral
b) Proportional plus integral minus derivative
c) Proportional plus derivative
d) Proportional plus integral plus derivative
View Answer

Answer: b
Explanation: Three combinations of the control system are used in practice: Proportional plus integral, Proportional plus derivative, Proportional plus integral plus derivative. Proportional plus integral minus derivative is not a type of combination control.

11. Which of the following control is used to control water temperature in the heat exchanger process?
a) Feed-forward control
b) Cascade control
c) Sequential control
d) Cumulative control
View Answer

Answer: b
Explanation: The cascade control is used to control the temperature of water in the heat exchanger process. It consists of a primary loop and a secondary loop. The primary loop consists of a temperature sensor and the secondary loop consists of a steam flow sensor.

12. Which of the following is used in the measurement of water temperature and flow rate?
a) Cascade control
b) Sequential control
c) Feed-forward control
d) Concerted control
View Answer

Answer: c
Explanation: The Feed-forward control is used in the measurement of water temperature and flow rate. It is mostly used when pressure and temperature fluctuations occur in cascade control.

13. Which of the following is used when dynamics do not change with time?
a) Sequential control
b) Cascade control
c) Cumulative control
d) Adaptive control
View Answer

Answer: d
Explanation: Adaptive control is used when the process dynamics do not change with time or are not well defined. It is most useful in controlling the batch fermentation and fed-batch fermentation.

14. Which of the following control will lead to a reduction in deviation?
a) Cascade control
b) Adaptive control
c) Proportional plus derivative control
d) Proportional plus integral control
View Answer

Answer: c
Explanation: When Proportional plus derivative control is used, the output response to an error will lead to a reduction in deviation. It will also lead to faster stabilization and a reduced offset.

15. The two-position controller is a type of automatic controller.
a) True
b) False
View Answer

Answer: a
Explanation: The two-position controller is a simplest automatic controller that is either fully open (ON) or fully closed (OFF). It has got a final control unit in the form of a switch or valve.

Sanfoundry Global Education & Learning Series – Fermentation Technology.

To practice all areas of Fermentation Technology for Experienced people, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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