Industrial Electrical Systems - Unit 5: Diesel Power Stations
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Questions and Answers

What is the primary function of the air intake system in a diesel power station?

  • To supply necessary air to the engine for fuel combustion (correct)
  • To supply fuel to the engine
  • To cool the engine
  • To lubricate the engine

    • What is the purpose of the cooling system in a diesel power station?

  • To lubricate the engine
  • To reduce the noise level of the engine
  • To cool the engine exhaust gas
  • To keep the temperature of the engine parts within safe operating limits (correct)

    • What is the function of the lubricating system in a diesel power station?

  • To minimize the wear of rubbing surfaces of the engine (correct)
  • To cool the engine
  • To start the engine
  • To supply air to the engine

    • What is the primary function of the diesel engine in a diesel power station?

    <p>To produce mechanical energy</p> Signup and view all the answers

    What is the purpose of the silencer in the exhaust system of a diesel power station?

    <p>To reduce the noise level of the engine</p> Signup and view all the answers

    Why are diesel power stations used in places where demand of power is less?

    <p>Because they require less space and water</p> Signup and view all the answers

    What is the advantage of a diesel power station in terms of its thermal efficiency?

    <p>It is higher than that of a steam power station</p> Signup and view all the answers

    What is the function of the choke in the excitation unit of an alternator?

    <p>To adjust the terminal voltage at no-load condition</p> Signup and view all the answers

    Why are diesel power stations used as standby sets?

    <p>Because they can be started quickly and can pick up load in a short time</p> Signup and view all the answers

    What is the primary function of a UPS?

    <p>To safeguard equipment from power failure</p> Signup and view all the answers

    What is the purpose of the rectifier in a UPS?

    <p>To convert AC to DC voltage</p> Signup and view all the answers

    What is a disadvantage of a diesel power station in terms of its operation?

    <p>It does not work satisfactorily under overload conditions for a longer period</p> Signup and view all the answers

    What is the purpose of the batteries in a UPS?

    <p>To supply power during a mains failure</p> Signup and view all the answers

    What is the primary reason why diesel power stations are not used to generate bulk power?

    <p>Because they are more expensive to operate</p> Signup and view all the answers

    What is an advantage of a diesel power station in terms of its cost?

    <p>The overall cost is much less than that of a steam power station</p> Signup and view all the answers

    What is a disadvantage of a diesel power station in terms of its maintenance?

    <p>The cost of lubrication is generally high</p> Signup and view all the answers

    What is the primary function of a UPS?

    <p>To provide surge protection and backup power</p> Signup and view all the answers

    What is the advantage of a UPS over other immediate power supply systems?

    <p>Immediate protection against input power interruptions</p> Signup and view all the answers

    What is the purpose of a flywheel in a UPS?

    <p>To store energy</p> Signup and view all the answers

    What is the type of UPS that provides surge protection and backup power, but is the least expensive?

    <p>Off-line UPS</p> Signup and view all the answers

    What is the purpose of the rectifier in an on-line UPS?

    <p>To convert AC to DC</p> Signup and view all the answers

    What is the transfer time of an off-line UPS?

    <p>25 milliseconds</p> Signup and view all the answers

    What is the purpose of the tap-changing transformer in a line interactive UPS?

    <p>To change the tap depending on input voltage</p> Signup and view all the answers

    What is the type of UPS that is used where electrical isolation is mandatory?

    <p>On-line UPS</p> Signup and view all the answers

    What type of battery is commonly used in UPS systems?

    <p>Lead Acid/Plante Battery</p> Signup and view all the answers

    What is the unit of measurement used to size lead acid batteries designed for short discharge times?

    <p>Kilowatts per cell</p> Signup and view all the answers

    What is the purpose of calculating the battery capacity specifically for the operating temperature?

    <p>To ensure the battery operates efficiently at different temperatures</p> Signup and view all the answers

    What is the factor to consider when evaluating the efficiency of a UPS system?

    <p>Normal operating conditions</p> Signup and view all the answers

    What is the purpose of redundancy in a UPS system?

    <p>To provide backup in case of a failure</p> Signup and view all the answers

    What is the importance of considering the recommended operating temperature range for the batteries?

    <p>To align with the environmental conditions of the installation site</p> Signup and view all the answers

    What is the purpose of monitoring and management features in a UPS system?

    <p>To enable remote monitoring, diagnostics, and alerts</p> Signup and view all the answers

    What is the factor to consider when selecting a battery type for a UPS system?

    <p>Energy density, cycle life, and maintenance requirements</p> Signup and view all the answers

    What is a crucial factor to consider when selecting battery banks?

    <p>The physical size and weight of the battery banks</p> Signup and view all the answers

    Why is it important to implement a battery monitoring system?

    <p>To track the health and performance of the batteries</p> Signup and view all the answers

    What should be done to ensure overall system safety?

    <p>Implement safety measures such as proper ventilation</p> Signup and view all the answers

    What should be checked to assess the expected lifespan and replacement costs?

    <p>The warranty provided by the manufacturer</p> Signup and view all the answers

    What is essential for compliance and safety?

    <p>Adhering to local codes and regulations</p> Signup and view all the answers

    What should be done to ensure a reliable and efficient backup power system?

    <p>Ensuring seamless integration between the UPS and battery banks</p> Signup and view all the answers

    Who should be consulted when selecting UPS and battery banks?

    <p>A professional or a reputable supplier</p> Signup and view all the answers

    What should be developed to verify the functionality of both the UPS and battery banks?

    <p>A testing and maintenance schedule</p> Signup and view all the answers

    What is the primary function of the fuel supply system in a diesel power station?

    <p>To inject fuel oil into the engine cylinder</p> Signup and view all the answers

    What is the function of the exhaust system in a diesel power station?

    <p>To lead the engine exhaust gas outside the building and discharge it into the atmosphere</p> Signup and view all the answers

    What is the purpose of the silencer in the exhaust system of a diesel power station?

    <p>To reduce the noise level</p> Signup and view all the answers

    What is the function of the lubricating system in a diesel power station?

    <p>To minimize the wear of rubbing surfaces of the engine</p> Signup and view all the answers

    What is the purpose of a UPS?

    <p>To maintain a continuous supply of electrical power, even in the event of failure of the mains supply</p> Signup and view all the answers

    What is the primary function of the rectifier in a UPS?

    <p>To convert the mains alternating current (a.c.) supply to a direct current (d.c.) voltage</p> Signup and view all the answers

    What is the function of the batteries in a UPS?

    <p>To supply power during a mains failure</p> Signup and view all the answers

    What is a disadvantage of a diesel power station in terms of its maintenance?

    <p>High maintenance charges</p> Signup and view all the answers

    What is the main reason why diesel power stations are not used for generating bulk power?

    <p>Insufficient quantity of coal and water</p> Signup and view all the answers

    What is an advantage of diesel power stations in terms of their layout?

    <p>The design and layout of the plant are quite simple</p> Signup and view all the answers

    What is a disadvantage of diesel power stations in terms of their operation?

    <p>They have high running charges</p> Signup and view all the answers

    What is a characteristic of diesel power stations?

    <p>They can be started quickly</p> Signup and view all the answers

    Why are diesel power stations used as standby sets?

    <p>To provide backup power during outages</p> Signup and view all the answers

    What is an advantage of diesel power stations in terms of their cost?

    <p>The overall cost is much less than that of steam power stations</p> Signup and view all the answers

    What is a characteristic of diesel power stations?

    <p>They can be located at any place</p> Signup and view all the answers

    What is a disadvantage of diesel power stations in terms of their operation?

    <p>The plant does not work satisfactorily under overload conditions for a longer period</p> Signup and view all the answers

    What is the primary advantage of a UPS over other immediate power supply systems?

    <p>Immediate protection against input power interruptions</p> Signup and view all the answers

    What is the purpose of the tap-changing transformer in a line interactive UPS?

    <p>Voltage regulation</p> Signup and view all the answers

    Which type of UPS is used where electrical isolation is mandatory?

    <p>On-line UPS</p> Signup and view all the answers

    What is the transfer time of an on-line UPS?

    <p>Zero milliseconds</p> Signup and view all the answers

    What is the purpose of the rectifier in an off-line UPS?

    <p>Convert AC to DC</p> Signup and view all the answers

    What is the type of UPS that provides surge protection and backup power, but is the least expensive?

    <p>Off-line UPS</p> Signup and view all the answers

    What is the primary function of a UPS?

    <p>Supply power to the equipment</p> Signup and view all the answers

    What is the purpose of the batteries in a UPS?

    <p>Store energy for backup power</p> Signup and view all the answers

    What is an important consideration when selecting battery banks?

    <p>Physical size and weight</p> Signup and view all the answers

    Why is monitoring the health and performance of batteries important?

    <p>To ensure the reliability of the backup power system</p> Signup and view all the answers

    What should be implemented to enhance overall system safety?

    <p>Proper ventilation for batteries</p> Signup and view all the answers

    What should be checked to assess the expected lifespan and replacement costs of batteries?

    <p>Warranty</p> Signup and view all the answers

    Why is it essential to ensure seamless integration between the UPS and battery banks?

    <p>To increase the reliability of the backup power system</p> Signup and view all the answers

    What should be developed to verify the functionality of both the UPS and battery banks?

    <p>Testing and maintenance schedules</p> Signup and view all the answers

    Why is it important to consider the recommended operating temperature range for the batteries?

    <p>To increase the lifespan of the batteries</p> Signup and view all the answers

    Who should be consulted when selecting UPS and battery banks?

    <p>A professional or reputable supplier</p> Signup and view all the answers

    What is the unit of measurement used to size lead acid batteries designed for long-term discharge?

    <p>Ampere per cell</p> Signup and view all the answers

    What is the purpose of calculating the battery capacity specifically for the operating temperature?

    <p>To optimize battery performance and lifespan</p> Signup and view all the answers

    What is the factor to consider when evaluating the efficiency of a UPS system?

    <p>Efficiency during normal operating conditions</p> Signup and view all the answers

    What is the importance of considering the recommended operating temperature range for the batteries?

    <p>To optimize battery performance and lifespan</p> Signup and view all the answers

    What is the purpose of monitoring and management features in a UPS system?

    <p>To enable remote monitoring, diagnostics, and alerts</p> Signup and view all the answers

    What is a crucial factor to consider when selecting a battery type for a UPS system?

    <p>Energy density</p> Signup and view all the answers

    What is the purpose of redundancy in a UPS system?

    <p>To ensure system reliability in case of a failure</p> Signup and view all the answers

    What is a key consideration when selecting a UPS and battery banks?

    <p>Power backup requirements of the application</p> Signup and view all the answers

    Study Notes

    Diesel Power Station (DG Set)

    • A generating station that uses a diesel engine as the prime mover for electrical energy generation
    • Diesel engine drives an alternator, converting mechanical energy into electrical energy
    • Advantages:
      • Simple design and layout
      • Occupies less space
      • Can be located anywhere
      • Quick start-up and load pick-up
      • No standby losses
      • Low water requirement for cooling
      • Higher thermal efficiency than steam power stations
      • Requires less operating staff
    • Disadvantages:
      • High running charges due to costly fuel
      • Poor performance under overload conditions
      • Limited power generation capacity
      • High lubrication costs
      • High maintenance costs

    Schematic Arrangement of Diesel Power Station

    • Auxiliaries include:
      • Fuel supply system
      • Air intake system
      • Exhaust system
      • Cooling system
      • Lubricating system
      • Engine starting system
    • Alternator is a salient pole type synchronous generator with adjustable voltage

    Uninterruptible Power Supply (UPS)

    • A device that maintains continuous power supply during mains failure
    • Used to safeguard equipment, especially in data centers and large organizations
    • Working principle:
      • Mains AC supply converted to DC voltage by rectifier
      • DC voltage used to charge batteries or stored energy
      • During mains failure, stored energy converted back to AC by inverter
      • Power supplied to load or equipment
    • Types of UPS:
      • On-line UPS
      • Off-line UPS (Standby UPS)
      • Line Interactive UPS
    • Battery types used in UPS systems:
      • Lead acid/plante battery
      • Lead acid/Antimony battery
      • ... (other types listed in the text)

    Battery Sizing

    • Manufacturers provide sizing information for batteries
    • Calculations consider temperature, watts per cell, amperes per cell, and other factors

    Selection of UPS and Battery Banks

    • Key considerations:
      • Power capacity
      • Topology
      • Redundancy
      • Scalability
      • Efficiency
      • Compatibility
      • Monitoring and management
      • Form factor
    • For battery banks:
      • Battery type
      • Capacity and autonomy
      • Charging time
      • Temperature considerations
      • Maintenance requirements
      • Footprint
      • Monitoring system
      • Warranty
      • Integration and safety
      • Testing and maintenance

    Diesel Power Station (DG Set)

    • A generating station that uses a diesel engine as the prime mover for electrical energy generation
    • Diesel engine drives an alternator, converting mechanical energy into electrical energy
    • Advantages:
      • Simple design and layout
      • Occupies less space
      • Can be located anywhere
      • Quick start-up and load pick-up
      • No standby losses
      • Low water requirement for cooling
      • Higher thermal efficiency than steam power stations
      • Requires less operating staff
    • Disadvantages:
      • High running charges due to costly fuel
      • Poor performance under overload conditions
      • Limited power generation capacity
      • High lubrication costs
      • High maintenance costs

    Schematic Arrangement of Diesel Power Station

    • Auxiliaries include:
      • Fuel supply system
      • Air intake system
      • Exhaust system
      • Cooling system
      • Lubricating system
      • Engine starting system
    • Alternator is a salient pole type synchronous generator with adjustable voltage

    Uninterruptible Power Supply (UPS)

    • A device that maintains continuous power supply during mains failure
    • Used to safeguard equipment, especially in data centers and large organizations
    • Working principle:
      • Mains AC supply converted to DC voltage by rectifier
      • DC voltage used to charge batteries or stored energy
      • During mains failure, stored energy converted back to AC by inverter
      • Power supplied to load or equipment
    • Types of UPS:
      • On-line UPS
      • Off-line UPS (Standby UPS)
      • Line Interactive UPS
    • Battery types used in UPS systems:
      • Lead acid/plante battery
      • Lead acid/Antimony battery
      • ... (other types listed in the text)

    Battery Sizing

    • Manufacturers provide sizing information for batteries
    • Calculations consider temperature, watts per cell, amperes per cell, and other factors

    Selection of UPS and Battery Banks

    • Key considerations:
      • Power capacity
      • Topology
      • Redundancy
      • Scalability
      • Efficiency
      • Compatibility
      • Monitoring and management
      • Form factor
    • For battery banks:
      • Battery type
      • Capacity and autonomy
      • Charging time
      • Temperature considerations
      • Maintenance requirements
      • Footprint
      • Monitoring system
      • Warranty
      • Integration and safety
      • Testing and maintenance

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    Description

    This quiz covers the basics of diesel power stations, including the working principles of diesel generator sets, prime movers, and electrical energy generation.

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