Tiêu đề 22525 Energy Conservation & Audit.pdf ✅

MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION (Autonomous) (ISO/IEC - 27001 - 2013 Certified) SUMMER – 2023 EXAMINATION - Subject Name: Energy Conservation & Audit Subject Code: 22525 __________________________________________________________________________________________________ Important Instructions to examiners: 1) The answers should be examined by key words and not as word-to-word as given in the model answer scheme. 2) The model answer and the answer written by candidate may vary but the examiner may try to assess the understanding level of the candidate. 3) The language errors such as grammatical, spelling errors should not be given more Importance. (Not applicable for subject English and Communication Skills). 4) While assessing figures, examiner may give credit for principal components indicated in the figure. The figures drawn by candidate and model answer may vary. The examiner may give credit for any equivalent figure drawn. 5) Credits may be given step wise for numerical problems. In some cases, the assumed constant values may vary and there may be some difference in the candidate’s answers and model answer. 6) In case of some questions credit may be given by judgement on part of examiner of relevant answer based on candidate’s understanding. 7) For programming language papers, credit may be given to any other program based on equivalent concept. 8) As per the policy decision of Maharashtra State Government, teaching in English/Marathi and Bilingual (English + Marathi) medium is introduced at first year of AICTE diploma Programme from academic year 2021-2022. Hence if the students write answers in Marathi or bilingual language (English +Marathi), the Examiner shall consider the same and assess the answer based on matching of concepts with model answer. Q. Sub Q. Answer Marking N. N. Scheme 1 Attempt any FIVE of the following: 10 Marks a) List any two designed consumers as per Energy Conservation Act. 1 mark 1. Industries for each 2. Commercial Buildings (2 3. Government Institutions marks) 4. Transport Sector 5. Municipalities and Local Bodies b) Write any four energy conservation techniques in transformer. 1⁄2 1. High-Efficiency Core Materials mark for 2. Efficient Winding Design each 3. Proper Cooling Systems (2 4. Reduced No-Load Losses marks) 5. Load Management 6. On-Load Tap Changers 7. Regular Maintenance and Monitoring 8. Energy-Efficient Transformers c) What is technical loss in electrical installation system 1 mark Technical losses are the losses that occur within the distribution network due to the for each cable, overhead lines, transformers and other substation equipment that we use to (2 transfer electricity. Marks) d) What is need of energy conservation in lighting system? 1 mark Page 1 of 16
MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION (Autonomous) (ISO/IEC - 27001 - 2013 Certified) SUMMER – 2023 EXAMINATION - Subject Name: Energy Conservation & Audit Subject Code: 22525 __________________________________________________________________________________________________ Ans:- for each 1. Lighting must be energy efficient and use of more illumination from less power (2 2. Intensity of light control by various control technologies such as GPRS or GSM marks) 3. Replacement of traditional lamp by energy efficient lamp like CFL lamps and LED lamps. 4. Energy consumption can be reduced by using electronic ballast in stead of electromagnetic ballast. 5. Energy can be conserve by using energy efficient luminaries in lighting system. e) Define i) Co-generation ii) Tariff 1 mark i) Co-generation: for each Defination:- (2 Co-generation is a process where electricity and useful heat are simultaneously Marks) produced from the same energy source. ii) Tariff:- Defination:- The rate at which electrical energy is supplied to a consumer is known as tariff. f) Define Energy Audit as per Energy Conservation Act. (2 Defination:- marks) An energy audit is an inspection and analysis of energy flows in a building with the objective of understanding the energy efficiency home or building being audited. g) List any four energy conservation equipment’s. 1⁄2 mark 1. Electronic ballast for each 2. Dimmer stat (2 3. PIR and ultrasonic based controls marks) 4. Autotransformer 5. Tap changing transformer 6. Soft starter 7. APFC 8. Reactive power compensating equipments 9. VAR controller 2 Attempt any THREE of the following: 12 Marks a) Why star labeling of equipment is required? Also state its benefits. 1 mark Star labeling of equipment is required to provide consumers with information about the energy efficiency of a particular product. The benefits of star labeling of equipment are as follows: 1. Star labeling raises awareness among consumers about the energy efficiency of various products. 2. It helps consumers make informed decisions by considering the energy performance of the equipment before purchasing. 3. This promotes a culture of energy conservation and encourages consumers to choose energy-efficient options. 4. The star labeling system enables easy comparison of different models and brands of equipment. Consumers can quickly identify and compare the Page 2 of 16
MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION (Autonomous) (ISO/IEC - 27001 - 2013 Certified) SUMMER – 2023 EXAMINATION - Subject Name: Energy Conservation & Audit Subject Code: 22525 __________________________________________________________________________________________________ energy efficiency ratings of similar products, 5. It help them select the most energy-efficient and cost-effective option. This empowers consumers to choose equipment that will result in long-term energy savings and lower operating costs. 3 marks 6. Energy-efficient equipment, as indicated by higher star ratings, generally (4 consumes less energy. marks) 7. By selecting energy-efficient models, consumers can reduce their energy bills over time. 8. The cost savings realized through lower energy consumption can offset the potentially higher upfront cost of energy-efficient equipment. 9. Energy-efficient equipment reduces the overall energy demand, which has a positive environmental impact sustainability. b) State any four methods for energy conservation techniques in Induction motor. There are several methods and techniques for energy conservation in induction motors. Here are some commonly used methods: 1 mark 1. Use of Variable Frequency Drives (VFDs) for each 2. Efficient Motor Sizing (4 3. Motor Rewinding and Maintenance marks) 4. Power Factor Correction. 5. Energy-Efficient Motor Design. 6. Load Optimization and Control 7. Motor Shutdown or Standby Mode c) Draw block diagram/SLD for APFC & write its working principle. (4 marks) d) Differentiate between topping cycle and bottoming cycle. TOPPING CYCLE CHP 2 mark Page 3 of 16
MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION (Autonomous) (ISO/IEC - 27001 - 2013 Certified) SUMMER – 2023 EXAMINATION - Subject Name: Energy Conservation & Audit Subject Code: 22525 __________________________________________________________________________________________________ Topping cycle CHP is the process of using fuel to generate mechanical energy which for each is used to create electricity using a generator. The resulting waste heat is captured (4 from this process to heat water for use as hot water or steam throughout the marks) facility. BOTTOMING CYCLE CHP Bottoming Cycle CHP, sometimes called Waste Heat to Power (WHP), is where fuel is combusted to produce useful heat to carry out an industrial process of some sort. Some of the waste heat from this process is recovered via a heat exchanger, producing thermal energy which is used to power a turbine generator to produce electricity. Any four equivalent difference 3 Attempt any THREE of the following : 12 Marks a State any four advantages of energy audit. 1 mark Maintenance cost can be reduced for each 1. It promote saving in other charges like water charge (4 2. The audit identify opportunities and provide financial analyse marks) 3. It help to understand where energy used and which area worth focusing on the most. 4. It provide benchmark information to understand the energy use performance compared to other in similar area. 5. Protect the environment by reducing power generation 6. Reduce running costs 7. Making changes to produce equipment and system to save energy 8. Identify and minimize wastage. 9. It help to reduce expenditure on energy Page 4 of 16