NPTEL Sensors and Actuators Week 6 Assignment Answers 2025
1. Evaluate whether the below statement is true or false:
“Biosafety hood can be disinfected by UV or steam sterilization.”
- True
- False
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2. Complete the following statement:
“In the fabrication process, acetone dip is performed to remove …………”
- Gold
- SiO2
- Photoresist
Answer :-
3. Why additional signal conditioning circuit is needed in between temperature sensor and ADC?
- Signal conditioning circuit will improve sensitivity of Op amp.
- Signal conditioning circuit will improve the power consumption.
- Signal conditioning circuit will improve resolution (each level height)
- Signal conditioning circuit will reduce hardware.
Answer :-
4. Complete the following sentence:
“Spin-coated photoresist thickness is independent of …………”
- Spin coater rotation speed
- Coated primer
- Spin coating time
- Viscosity of photoresist
Answer :-
5. Considering COMSOL Multiphysics simulation, what should be the flow of the modelling?
I. Make geometry
II. Post process results
III. Add materials
IV. Choose type of study
V. Apply physics conditions
- I, III, V, II, IV
- I, III, IV, V, II
- I, III, V, IV, II
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6. What is the angle between primary and secondary flats for <100> p-type silicon wafer?
- 180 degree
- 90 degree
- 45 degree
Answer :-
7. Complete the following statement: “HEPA filter stands for …………….”
- Highly Efficient Particulate Assembly filter
- High Efficient Pressure Assembly filter
- High-Efficiency Particulate Air filter
Answer :-
8. What is the resolution of an 8-bit ADC working at a reference voltage of 3 V?
- 0.5 V
- 11.72 V
- 12.5 V
- 0.375 V
Answer :-
8. Processes related to photolithography are mentioned below. Choose the proper order in which they will be performed:
I. Soft bake
II. Photoresist coating
III. Wafer Cleaning
IV. Primer coating
V. Exposure
VI. Alignment
VII. Development
VIII. Hard bake
- III – I – IV– II – V – VI– VIII – VII
- III – IV – II – I – VI – V – VII – VIII
- c. IV – I – II – VI – V – III – VII – VIII
- III – IV – I – II – V – VI – VII – VIII
Answer :-
10. Evaluate whether the below statement is true or false:
The “Class” number of a clean room denotes the number of particles and people per cubic feet allowed inside the facility.
- True
- False
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