About this previous year paper
SECTION A
(2 × 10 = 20 marks | Very Short Answers)
a) Plant-based biomass
Plant-based biomass refers to organic material obtained from plants, such as crops, crop residues, wood, and agricultural waste, used for energy and products.
b) Diversity of biomass
Diversity of biomass means the variety of biological materials available from plants, animals, and microorganisms that can be used for energy and economic activities.
c) Analog filters
Analog filters are electronic circuits that operate on continuous signals to pass desired frequencies and block unwanted frequencies.
d) Use of op-amp resistor circuits
Op-amp resistor circuits are used for amplification, filtering, signal conditioning, and mathematical operations like addition and integration.
e) Aquatic biomass
Aquatic biomass includes plants and organisms found in water, such as algae, seaweed, and aquatic plants, used as a renewable energy source.
f) Biomass energy
Biomass energy is energy obtained from organic materials like plant waste, animal waste, and biofuels through combustion or conversion processes.
g) Alcohol fuels
Alcohol fuels are liquid biofuels such as ethanol and methanol, produced from biomass and used as alternatives to fossil fuels.
h) Use of landfill gases
Landfill gases (mainly methane) are used for electricity generation, heating, and as vehicle fuel, reducing greenhouse gas emissions.
i) Anaerobic digestion
Anaerobic digestion is a process in which microorganisms break down organic matter in the absence of oxygen, producing biogas as energy.
j) Examples of liquid biofuels
Examples include ethanol, biodiesel, bio-methanol, and bio-butanol.
SECTION B
(Attempt any 3 | 10 marks each)
a) Circuit simulated modeling
Circuit simulated modeling uses computer software to analyze electronic circuits before physical implementation. It predicts voltage, current, frequency response, and performance, reducing cost and errors.
b) Bio-based economy
A bio-based economy uses renewable biological resources to produce food, energy, chemicals, and materials, reducing dependence on fossil fuels and supporting sustainability.
c) Ideal bio-economy cycle (developed country)
Biomass is produced → processed in biorefineries → converted into energy, fuels, and products → waste is recycled → nutrients returned to agriculture, forming a closed-loop sustainable cycle.
d) Recycling process of plant-based biomass
Plant waste is collected, sorted, processed through composting or bio-conversion, and reused as bioenergy, fertilizers, or raw materials, minimizing waste.
e) Principle and working of analog filters
Analog filters work on the principle of frequency-dependent impedance using resistors, capacitors, and op-amps to shape signal frequency response.
SECTION C
Q3 (Attempt any one)
a) Principle and applications of op-amp models
Op-amp models amplify the difference between input signals.
Applications: amplifiers, filters, oscillators, signal conditioning, and control systems.
b) Types of filters
Low-pass High-pass
Band-pass Band-stop
Low-pass filter: Allows low frequencies and attenuates high frequencies, widely used in audio systems.
Q4 (Attempt any one)
a) Tools supporting bio-economy transition
Government policies Research & development
Biorefineries Market incentives
Public-private partnerships
b) Role of government in environmental economics
Governments regulate pollution, promote renewable energy, provide subsidies, impose taxes on pollution, and encourage sustainable development.
Q5 (Attempt any one)
a) Concept of biorefineries
Biorefineries convert biomass into fuels, power, and value-added chemicals, similar to petroleum refineries but renewable.
b) Resource competition and food security
Competition between food and fuel crops can affect food security. Balanced policies ensure sustainable resource use without compromising food supply.
Q6 (Attempt any one)
a) Bio-based resources and value chain
Bio-based value chain includes biomass production → processing → conversion → distribution → end-use, ensuring economic and environmental benefits.
b) Biomass for fuel and chemicals
Biomass is converted into biofuels, biogas, ethanol, biodiesel, and bio-chemicals through fermentation, gasification, and pyrolysis.
Q7 (Attempt any one)
a) Dynamic management of fossil fuels
Dynamic management focuses on efficient use, conservation, substitution with renewables, and long-term sustainability of fossil resources.
b) Biofuels and increasing their production
Types: Solid biofuels
Liquid biofuels Gaseous biofuels
Production can be increased through advanced technologies, better crop yields, waste utilization, and government support.
SEM VII – ALL SUBJECTS COMPLETED (100%)
You now have section-wise, exam-ready answers for:
HVAC Systems Mathematical Modeling of Manufacturing Processes
Machine Learning Maintenance Engineering & Management
Power Plant Engineering Filter Design
Bioeconomics