This set of Fermentation Technology Multiple Choice Questions & Answers (MCQs) focuses on “Instrumentation and Control – Agitation and Foam Sensing and Valves”.
1. Which of the following is used in agitation measurement?
a) Torsion dynamometer
b) Bourdon tube
c) Diaphragm gauge
d) Strain gauge
View Answer
Explanation: Torsion dynamometer is used in the agitation measurement. It is used on a small scale and is placed outside the vessel. It is less accurate due to friction. The Bourdon tube, Diaphragm gauge, and strain gauge are used in the measurement of pressure.
2. Which of the following is used to control the agitation speed?
a) Dynamometer
b) Tachometer
c) Strain gauge
d) Bourdon tube
View Answer
Explanation: The Tachometer is used to control the agitation speed. The rate of rotation is monitored either by electromagnetic voltage or induction generation or light sensing or magnetic force.
3. Who gave the treatment of strain gauge measurements?
a) Brodgesell
b) Aiba
c) Bourdon
d) Hall
View Answer
Explanation: The theoretical treatment of the strain gauge measurements was covered by Aiba et al. in 1973. They mounted four identical strain gauge at 45° to the axis of the hollow shaft.
4. In which of the following valve a sliding disc is moved in or out of flow path?
a) Gate valve
b) Globe valve
c) Needle valve
d) Piston valve
View Answer
Explanation: The gate valve consists of a sliding disc that moved in or out of the flow path. It is used for purpose steam or a water line. It is not used for regulating flow.
5. Which of the following valve consists of a tapered plug?
a) Piston valve
b) Globe valve
c) Needle valve
d) Plug valve
View Answer
Explanation: The needle valve consists of a tapered plug. It is similar to the globe valve but the disc is replaced by a tapered valve or needle fitted into the tapered valve seat.
6. Which of the following valve consists of a disc which rotates about a shaft in a housing?
a) Butterfly valves
b) Piston valve
c) Ball valves
d) Pinch valves
View Answer
Explanation: Butterfly valve consists of a disc which rotates about a shaft in a housing. It is usually used in large diameter pipes operating under low pressure. It is not suitable for aseptic operation.
7. Which of the following valve is used for pressure control?
a) Gate valves
b) Globe valves
c) Needle valves
d) Safety valves
View Answer
Explanation: The safety valves are used for controlling pressure. It must be incorporated into every vessel which is subjected to pressure to ensure pressure does not exceed over safe limit recommended by the manufacturer.
8. What is the function of check valves?
a) To prevent the reversal of flow of liquid
b) To reduce the pressure
c) To reduce the flow rate
d) To increase the flow rate
View Answer
Explanation: The function of check valves is to prevent the accidental reversal of the flow of liquid. It consists of three basic types of valves: swing check, lift check, and combined stop and check.
9. Which of the following valves is the most suitable for aseptic operation?
a) Butterfly valves
b) Ball valves
c) Needle valves
d) Globe valves
View Answer
Explanation: Ball valve is the most suitable valve for aseptic operation. It is made up of stainless steel ball through which orifice is machined. The butterfly valve is not suitable for aseptic operation. The needle valve has very limited application in aseptic operation.
10. Which of the following valve is the most widely used in the design of the fermenter?
a) Diaphragm valve
b) Needle valve
c) Butterfly valve
d) Plug valve
View Answer
Explanation: The diaphragm valve is most widely used in designing of the fermenter. Ball valves are also used, but they are more robust and contain crevices which make the sterilization more difficult.
11. Which of the following valve consists of a horizontal plug or disc is raised or lowered to control flow rate?
a) Plug valves
b) Globe valves
c) Butterfly valve
d) Needle valves
View Answer
Explanation: The globe valve consists of a horizontal plug or disc. This disc is lowered or raised to control the rate of flow. It is most commonly useful in regulating the flow of water or steam. It is not suitable for aseptic operation.
12. Which of the following is not an antifoam device?
a) Discs
b) Propellers
c) Brushes
d) Load cell
View Answer
Explanation: The mechanical antifoam devices are devices, Propellers, Brushes or Hollow cones. They are used for the mechanical breaking of foam. Load cells are used for determining the weight of the fermenter vessel.
13. Which of the following is used for measuring gas flow?
a) Rotameter
b) Spectrophotometer
c) UV transilluminator
d) Chromatography
View Answer
Explanation: The Rotameter is useful in the measurement of gas flow. It consists of a vertically mounted glass tube. Rotameters are also used to measure the flow rate of liquid if abrasive or fibrous materials are not present.
14. The pinch valve consists of a sleeve closed by pinch bar.
a) True
b) False
View Answer
Explanation: The pinch valves consists of a flexible sleeve closed by a pair of pinch bars that can be operated by compressed air remotely or automatically. It is suitable for aseptic operations.
15. Load cells are used for the measurement of pressure.
a) True
b) False
View Answer
Explanation: Load cells are used for the measurement of weight of the fermenter vessel. It is essentially an elastic body. It is assembled in a suitable housing with an electrical cable connecting points.
Sanfoundry Global Education & Learning Series – Fermentation Technology.
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