(SEM VII) THEORY EXAMINATION 2024-25 ENERGY CONSERVATION AND AUDITING

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

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

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

Q7(b) CFL & LED lighting

CFL saves 60–70% energy                                LED saves up to 80%

Longer life                                                        Lower heat loss

Environment friendly