EX-703-B Energy Audit & Management - Dec 2025 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aWhat is energy auditing? Explain the need for energy auditing in industrial sectors.
   How to answer

   • Define energy auditing as systematic inspection and analysis of energy flows
   • List needs: rising cost, wastage identification, efficiency, competitiveness
   • Explain benefits in industrial sectors: cost saving, conservation, compliance
2. 7 Marks
   bDescribe the different types of energy audits and their significance in energy conservation programs.
   How to answer

   • List types: preliminary, general, detailed/comprehensive, investment-grade audit
   • Explain scope and methodology of each type
   • Discuss significance in identifying saving potential and conservation programs
3. 7 Marks
   aExplain the role and responsibilities of an energy manager in promoting energy efficiency in an organization.
   How to answer

   • Define role of energy manager in organization
   • List responsibilities: monitoring, audit, benchmarking, training
   • Explain promotion of efficiency culture and reporting
4. 7 Marks
   bWhat are the main components of EB billing? How do demand and energy charges influence electricity cost?
   How to answer

   • List EB billing components: demand charge, energy charge, PF penalty, fuel surcharge
   • Explain demand (kW/kVA) vs energy (kWh) charges
   • Discuss impact on total electricity cost and load management
5. 7 Marks
   aDefine Lux and Lumen. Describe different types of lighting and explain the role of LED lighting in energy conservation.
   How to answer

   • Define Lux (illuminance) and Lumen (luminous flux)
   • Describe types: incandescent, fluorescent, CFL, LED, HID
   • Explain LED advantages: efficacy, life, savings in conservation
6. 7 Marks
   bA single phase motor connected to 400 V, 50 Hz supply taskes 31.7A at a power factor of 0.7 lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.9 lagging.
   How to answer

   • Calculate active power $P = VI\cos\phi_1$ and reactive powers
   • Find required kVAr $Q_c = P(\tan\phi_1-\tan\phi_2)$
   • Calculate capacitance $C = Q_c/(2\pi f V^2)$ and give value in $\mu F$
7. 7 Marks
   aExplain the working of boilers, furnaces, and thermic fluid heaters. How is their efficiency computed?
   How to answer

   • Explain working of boilers, furnaces and thermic fluid heaters
   • List heat transfer and combustion principles
   • Give direct/indirect efficiency computation method and formula
8. 7 Marks
   bDescribe the components and operation of a steam distribution system. How can steam losses be minimized?
   How to answer

   • List steam distribution components: boilers, pipelines, traps, insulation, valves
   • Explain operation and pressure/temperature control
   • Suggest loss minimization: insulation, leak repair, trap maintenance
9. 7 Marks
   aDiscuss the importance of condensate recovery and flash steam utilization in thermal systems.
   How to answer

   • Define condensate recovery and flash steam formation
   • Explain energy and water saving benefits
   • Discuss utilization methods in thermal systems
10. 7 Marks
    bExplain energy conservation measures in pumps. How does proper selection and operation improve efficiency?
    How to answer

    • List conservation measures: proper sizing, VSD, trimming, maintenance
    • Explain selection at best efficiency point
    • Relate operation control to efficiency improvement
11. 7 Marks
    aDescribe methods to improve energy efficiency in compressed air systems. Mention common losses and their remedies.
    How to answer

    • List methods: leak reduction, pressure optimization, intake air improvement
    • Mention common losses: leaks, pressure drops, idle running
    • Give remedies for each loss
12. 7 Marks
    bWhat are cooling towers? Discuss their energy-saving measures and efficiency improvement techniques.
    How to answer

    • Define cooling towers and their types
    • List energy-saving measures: fan control, fill maintenance, water treatment
    • Explain efficiency improvement techniques
13. 7 Marks
    aWhat is payback period? How is it calculated, and why is it important in energy investment decisions?
    How to answer

    • Define payback period as time to recover initial investment
    • Give formula: initial investment / annual savings
    • Explain importance in quick screening of energy investments
14. 7 Marks
    bWhat is Net Present Value? Discuss its role in assessing the profitability of energy projects.
    How to answer

    • Define NPV as present value of cash inflows minus outflow
    • Give discounting formula and decision criterion NPV>0
    • Discuss role in profitability assessment of energy projects
15. 14 Marks
    Write short notes on: (Any two) :

    1. a)Life Cycle costing
    2. b)Causes & effects of low power factor
    3. c)Efficiency computation and energy conservation measures
    4. d)Refrigeration & Air Conditioning systems
    How to answer

    • Select any two topics from (a)-(d) for short notes
    • Give definition, key points and relevance to energy audit
    • Mention formulas/measures/examples and conservation benefits