Energy Conservation Techniques — MCQs – EE

1. The main goal of energy conservation techniques is to:
(A) Reduce energy consumption without affecting productivity
(B) Increase power demand
(C) Eliminate energy audits
(D) Increase production costs

2. Energy conservation means:
(A) Efficient and judicious use of available energy resources
(B) Generating more energy
(C) Reducing the number of energy meters
(D) Ignoring maintenance schedules

3. The most effective energy conservation approach in industry is:
(A) Improving process efficiency
(B) Increasing machine running hours
(C) Using oversized motors
(D) Ignoring system losses

4. The first step in implementing energy conservation techniques is:
(A) Conducting an energy audit
(B) Replacing all equipment
(C) Installing more transformers
(D) Increasing lighting intensity

5. One of the simplest energy conservation methods is:
(A) Switching off idle equipment
(B) Using larger cables
(C) Increasing load factor
(D) Running machines continuously

6. Power factor improvement helps in:
(A) Reducing reactive power losses and improving efficiency
(B) Increasing system losses
(C) Lowering voltage stability
(D) Overloading circuits

7. Installing capacitor banks in an industrial plant is a technique for:
(A) Power factor correction
(B) Voltage regulation only
(C) Harmonic suppression only
(D) Cooling improvement

8. Energy-efficient motors are designed to:
(A) Reduce losses and increase efficiency
(B) Increase current consumption
(C) Operate at higher slip
(D) Decrease motor life

9. Use of variable frequency drives (VFDs) helps in:
(A) Adjusting motor speed to process requirements
(B) Increasing constant-speed operation
(C) Reducing motor control flexibility
(D) Fixing voltage levels

10. In lighting systems, energy can be conserved by:
(A) Using LED or CFL lamps instead of incandescent lamps
(B) Using higher wattage bulbs
(C) Increasing illumination unnecessarily
(D) Avoiding natural light

11. Daylight utilization in buildings reduces:
(A) Artificial lighting energy consumption
(B) Airflow
(C) Building height
(D) Natural ventilation

12. Automatic lighting controls like occupancy sensors help in:
(A) Switching lights on/off based on room occupancy
(B) Manual operation only
(C) Increasing standby power
(D) Reducing daylight usage

13. Energy conservation in transformers can be achieved by:
(A) Reducing no-load and copper losses through efficient design
(B) Operating at low load factors
(C) Using oversized units
(D) Ignoring temperature rise

14. Proper maintenance of electrical equipment results in:
(A) Reduced losses and improved reliability
(B) Increased downtime
(C) More power failures
(D) Higher operating cost

15. Demand side management (DSM) aims to:
(A) Modify consumer demand patterns for energy efficiency
(B) Increase energy tariffs
(C) Build more power plants
(D) Reduce transmission losses

16. Energy-efficient lighting design involves:
(A) Optimizing luminaire placement and illumination levels
(B) Increasing bulb wattage
(C) Using dark-colored walls
(D) Decreasing light reflection

17. Load scheduling contributes to energy conservation by:
(A) Running equipment during off-peak hours
(B) Operating all machines simultaneously
(C) Increasing demand charges
(D) Ignoring tariff variations

18. High-efficiency transformers are preferred because they:
(A) Reduce energy losses and heat generation
(B) Increase magnetizing current
(C) Require larger cores
(D) Decrease efficiency at all loads

19. Power quality improvement helps in:
(A) Minimizing energy losses due to harmonics and voltage fluctuations
(B) Increasing load unbalance
(C) Creating frequent tripping
(D) Overloading cables

20. Automatic Power Factor Controller (APFC) panels are used to:
(A) Maintain optimal power factor automatically
(B) Reduce voltage
(C) Disconnect capacitor banks manually
(D) Measure harmonics only

21. Energy conservation in HVAC systems can be achieved by:
(A) Using energy-efficient chillers and variable speed fans
(B) Oversizing ducts and motors
(C) Ignoring room temperature control
(D) Running systems continuously

22. Heat recovery systems in industries conserve energy by:
(A) Reusing waste heat for other processes
(B) Discharging exhaust directly
(C) Cooling all exhaust gases
(D) Increasing fuel consumption

23. Using thermal insulation on pipes and furnaces helps in:
(A) Minimizing heat losses
(B) Increasing surface temperature
(C) Reducing system efficiency
(D) Allowing excessive heat radiation

24. Cogeneration (Combined Heat and Power) improves energy efficiency by:
(A) Utilizing waste heat from electricity generation
(B) Using single energy output systems
(C) Ignoring heat recovery
(D) Operating only on renewable energy

25. Energy-efficient pumps help in conservation by:
(A) Matching pump output with system demand
(B) Running continuously at full load
(C) Increasing system head unnecessarily
(D) Using oversized impellers

26. Compressed air system losses can be reduced by:
(A) Preventing air leaks and optimizing pressure levels
(B) Increasing discharge pressure
(C) Ignoring maintenance
(D) Using narrow pipes

27. Boiler efficiency can be improved by:
(A) Proper combustion control and waste heat recovery
(B) Excessive air supply
(C) Unregulated firing
(D) Ignoring flue gas temperature

28. Energy management systems (EMS) are used for:
(A) Monitoring, controlling, and optimizing energy usage
(B) Tracking employee attendance
(C) Planning logistics
(D) Managing only financial accounts

29. Renewable energy sources contribute to conservation by:
(A) Reducing dependence on fossil fuels
(B) Increasing emissions
(C) Replacing efficient systems
(D) Reducing system reliability

30. The ultimate aim of energy conservation techniques is to:
(A) Achieve sustainable development with minimal energy waste
(B) Increase operating costs
(C) Maximize fuel usage
(D) Reduce equipment life