NPTEL Sensors and Actuators Week 7 Assignment Answers 2025
1. Which of the following gas is preferably used in the sputtering method?
- Nitrogen
- Hydrogen
- Argon
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2. Evaluate whether the following statement is True/False.
“Oxygen plasma activation and bonding can be used to bond a microfluidic membrane made from PDMS to a glass substrate.”
- True
- False
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3. Complete the following sentence:
“DC sputtering is a commonly preferred physical vapour deposition technique. The target pallet present in the sputter system is kept at ………….”
- High positive bias with respect to the substrate chuck
- High negative bias with respect to the substrate chuck
- Same potential as the substrate check
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4. Which method is most preferable to deposit a thin film of titanium and molybdenum?
- Chemical vapour deposition
- Thermal evaporation
- Sputtering
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5. Which polymer is widely used in the fabrication of microfluidic chips?
- PES – Polyethersulfone
- PPSU – Polyphenylsulfone
- PETG – Polyethylene Terephtalate Glycol
- PDMS – Polydimethylsiloxane
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6. Quartz Crystal Micro-balance is used to:
- Measure the thickness of deposited layer.
- Measure the thickness of the grown layer on the substrate.
- Determine crystal orientation.
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7. The term “Mean free path” can be defined as …………….
- Average distance travelled by the evaporated source to the substrate.
- Distance travelled by a moving particle between two successive collisions.
- Trajectory of the path followed by a free-moving particle.
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8. Why microfluidic devices are preferable to static systems for the determination of drug efficacy?
- In microfluidic devices, drugs can react to tissues easily.
- Both static systems and microfluidic devices give the same result, so both are equivalent.
- Human body is a dynamic system, and microfluidic devices can replicate it.
- Microfluidic devices are cheaper than static systems.
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9. Thermal evaporation-based thin film deposition is one of the most common Physical Vapor Deposition (PVD) techniques. Which of the following statement does not hold for thermal evaporation?
- Before evaporation, the chamber is evacuated to remove the gas particles that help to increase the mean free path of evaporated particles.
- The materials with high melting points are difficult to be deposited.
- Inert gas is not supplied to the chamber to get higher throughput.
- None of these
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10. Evaluate whether the following statement is True or False.
“All the four channels in the multichannel peristaltic pump can circulate or flow liquid at the same flow rate only.”
- True
- False
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