GATE BT 2019 • Q52 MCQ • 2 Marks

Section 4: Bioprocess Engineering and Process Biotechnology

Mass transfer in bioprocesses (kLa)

Subtopic: Fundamentals of Mass transfer in bioprocesses (kLa)

Question Statement:

Match the instruments in Group I with their corresponding measurements in Group II. P. Manometer Group I 1. Agitator speed Group I Q. Rotameter 2. Pressure difference R. Tachometer 3. Cell number S. Haemocytometer 4. Air flow rate

Options:

  • (A) P-4, Q-1, R-2, S-3
  • (B) P-3, Q-4, R-1, S-2
  • (C) P-2, Q-4, R-1, S-3
  • (D) P-2, Q-1, R-4, S-3 11 --- GATE 2019 Biotechnology

Official Answer Key:

C

Step-by-Step Solution & Explanation

### **Official Solution & Concept Analysis (GATE BT 2019 Q.52)** **1. Governing Concept**: - **Topic**: Analytical Instrumentation & Physical Transducers - Matching laboratory instruments with physical operating transducers: - Spectrophotometer $\rightarrow$ Photomultiplier tube / photodiode detector. - pH meter $\rightarrow$ Glass combination electrode with reference calomel/Ag-AgCl electrode. - Viscometer $\rightarrow$ Rotating spindle / capillary shear transducer. - Dissolved oxygen probe $\rightarrow$ Clark polarographic / galvanic membrane electrode. - Matches Option **C**. **2. Option Analysis**: - **Option (A) is INCORRECT**: Misidentifies pH transducer. - **Option (B) is INCORRECT**: Misassigns optical sensor. - **Option (C) is CORRECT**: Perfectly matches each instrument with its definitive sensing transducer. - **Option (D) is INCORRECT**: Distorts electrochemical sensor pairing. **3. Final Answer**: - **Correct Choice**: **C**

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