About this previous year paper
KEE071 – ENERGY CONSERVATION AND AUDITING
Complete Solved Question Paper
SECTION A
(Attempt all questions – 2 × 10 = 20 marks)
Q1(a) Need of energy planning and audit
Ensures optimum use of energy Reduces energy cost
Identifies energy wastage Improves system efficiency
Helps in sustainable development
Q1(b) Energy intensity
Energy intensity is the amount of energy consumed per unit of output (e.g., kWh per product).
Importance: Indicates energy efficiency
Helps in benchmarking Lower intensity = better conservation
Q1(c) DSM vs Energy efficiency
| DSM | Energy Efficiency |
|---|---|
| Demand-side approach | Equipment-based |
| Reduces peak load | Reduces overall consumption |
| Utility driven | User driven |
Q1(d) EMIS (Energy Management Information System)
EMIS is a computer-based system used to collect, analyze, and report energy data for monitoring and improving energy performance.
Q1(e) Key elements of energy audit report
Executive summary Energy consumption analysis
Energy-saving opportunities Cost–benefit analysis
Implementation plan
Q1(f) Energy audit instruments
Power analyzer: Measures voltage, current, power Lux meter: Measures lighting levels
Q1(g) Series & parallel operation of pumps
Series operation: Increases head Parallel operation: Increases discharge
Helps in matching system demand and improving efficiency.
Q1(h) Methods to improve pump efficiency
Proper sizing Impeller trimming
Variable frequency drives (VFD) Reducing pipe losses
Regular maintenance
Q1(i) Benefits of energy-efficient motors
Lower power consumption Reduced operating cost
Higher efficiency Longer life
Lower heat losses
Q1(j) Voltage variation impact on lighting
Low voltage → reduced illumination High voltage → reduced lamp life
Causes energy wastage and poor performance
SECTION B
(Attempt any three – 10 × 3 = 30 marks)
Q2(a) Indian energy scenario
Coal dominant in power generation Growing renewable energy (solar, wind)
Major consumers: Industry
Transport Residential
Rising energy demand due to urbanization
Q2(b) DSM planning & implementation
Planning phase: Load analysis
Identify peak demand Set DSM objectives
Implementation phase:
Energy-efficient technologies Tariff incentives
Consumer awareness programs
Q2(c) Energy audit strategies
Preliminary audit Detailed audit
Data collection & analysis Identification of savings
Economic evaluation
Significance: Reduces cost and emissions.
Q2(d) Energy saving in compressed air systems
Fix air leaks Reduce operating pressure
Use efficient compressors Proper maintenance
Example: Leakage reduction can save up to 20–30% energy.
Q2(e) Simple payback vs Life cycle cost
| Simple Payback | Life Cycle Cost |
|---|---|
| Initial cost based | Total cost based |
| Easy to calculate | More accurate |
| Ignores maintenance | Includes all costs |
SECTION C
Q3(a) Long-term energy strategy
Diversification of energy sources Increase renewable share
Improve energy efficiency Energy security through domestic resources
Policy support and R&D
Q3(b) Electricity Act 2003
Promotes competition Encourages private participation
Supports renewable energy Mandates energy conservation
Strengthens regulatory framework
Q4(a) CUSUM technique
CUSUM tracks cumulative deviation of energy consumption from a baseline.
Uses: Detects abnormal energy use
Monitors performance improvements Evaluates conservation measures
Q4(b) UDAY scheme
UDAY (Ujwal DISCOM Assurance Yojana): Reduces DISCOM debt
Improves efficiency Reduces losses
Promotes energy conservation
Q5(a) Energy management team formation
Top management support Skilled energy manager
Cross-functional members Clear responsibilities
Regular monitoring
Q5(b) Steps in detailed energy audit
Planning Data collection
Measurement Analysis
Identification of savings Cost–benefit analysis
Report preparation
Q6(a) Cooling tower performance & savings
Measure approach & range Improve water distribution
Use efficient fans Reduce blowdown
Proper maintenance
Q6(b) Blowers – types & energy saving
Types: Centrifugal
Axial Positive displacement
Energy saving: Proper sizing
Speed control Reduced pressure drops
Q7(a) Energy-efficient motor vs standard motor
| Parameter | Standard | Energy Efficient |
|---|---|---|
| Efficiency | Lower | Higher |
| Losses | High | Low |
| Cost | Low | Slightly high |
| Operating cost | High | Low |
Q7(b) CFL & LED lighting
CFL saves 60–70% energy LED saves up to 80%
Longer life Lower heat loss
Environment friendly