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Automobiles Classification
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Automobiles Classification

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Questions and Answers

What is the classification of automobiles based on the number of wheels?

  • On the basis of transmission
  • On the basis of fuel used
  • On the basis of wheels (correct)
  • On the basis of load

    • Which type of vehicle has an engine located in the rear?

  • Truck
  • Nano car (correct)
  • Most of the cars
  • Scooter

    • What is the type of vehicle classified as Heavy Transport Vehicle (HTV)?

  • Bus
  • Car
  • Heavy motor vehicle (HMV) (correct)
  • Scooter

    • Which type of transmission does not require manual gear change?

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

    What is the type of vehicle classified as a four-wheeler?

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

    Which type of fuel is used by LPG and CNG vehicles?

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

    What are the two main units of an automobile?

    <p>Chassis and Body</p> Signup and view all the answers

    What is the term for the underlying framework or structure that supports various components such as the engine, suspension, brakes, and bodywork?

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

    What type of chassis is commonly used in passenger cars and some SUVs?

    <p>Monocoque (Unibody) Chassis</p> Signup and view all the answers

    What is the lowest position of the piston towards the crank end side of the cylinder?

    <p>Bottom Dead Center (B.D.C.)</p> Signup and view all the answers

    What is the inside diameter of the cylinder called?

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

    What is the function of the cylinder head gasket?

    <p>To provide a seal between the cylinder block and cylinder head</p> Signup and view all the answers

    What is the term for the topmost position of the piston towards the cover end side of the cylinder?

    <p>Top Dead Center</p> Signup and view all the answers

    What is the superstructure of the vehicle that is bolted to the chassis?

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

    What is the purpose of the combustion chamber in an engine?

    <p>To combust fuel and release thermal energy</p> Signup and view all the answers

    What is the function of the inlet manifold in an engine?

    <p>To connect the intake system to the inlet valve</p> Signup and view all the answers

    What is the purpose of the gudgeon pin in an engine?

    <p>To connect the piston to the connecting rod</p> Signup and view all the answers

    What is the function of the crankshaft in an engine?

    <p>To convert reciprocating motion into rotary motion</p> Signup and view all the answers

    What is the primary function of piston rings in a gasoline engine?

    <p>To provide a tight seal between the piston and the cylinder wall</p> Signup and view all the answers

    What is the purpose of the flywheel in a gasoline engine?

    <p>To provide a uniform torque to the crankshaft</p> Signup and view all the answers

    What is the primary function of the camshaft in a gasoline engine?

    <p>To control the opening and closing of the valves</p> Signup and view all the answers

    Why are diesel engines not preferred in commercial vehicles?

    <p>They have higher compression ratios and tend to be heavier and more expensive</p> Signup and view all the answers

    What is the primary advantage of diesel engines?

    <p>Better fuel economy and longer engine life</p> Signup and view all the answers

    What is the purpose of the connecting rod in a gasoline engine?

    <p>To connect the piston to the crankshaft</p> Signup and view all the answers

    What is the primary benefit of using a diesel engine in a big diesel tractor-trailer rig?

    <p>Better fuel efficiency</p> Signup and view all the answers

    Which type of engine is commonly used in passenger cars and light trucks due to its balance of performance, efficiency, and compact size?

    <p>Inline-4 (I4)</p> Signup and view all the answers

    What is the primary purpose of engine balancing in internal combustion engines?

    <p>To minimize vibrations and optimize performance</p> Signup and view all the answers

    What type of engine balancing deals with the forces caused by the reciprocating masses?

    <p>Primary Balancing</p> Signup and view all the answers

    What is the purpose of balancing shafts in inline-4 engines?

    <p>To counteract primary and secondary forces</p> Signup and view all the answers

    What is the advantage of using a Flat-4 (F4 or H4) engine in some sports cars and compact cars?

    <p>Low center of gravity</p> Signup and view all the answers

    What is a primary benefit of engine balancing in terms of operation?

    <p>Smooth operation</p> Signup and view all the answers

    What is a key consideration in balancing high-performance engines?

    <p>Higher operating speeds and demands</p> Signup and view all the answers

    What is the main goal of dynamic balancing?

    <p>To adjust imbalance forces and moments</p> Signup and view all the answers

    What is the purpose of the bobweight method in engine balancing?

    <p>To simulate piston and rod movements</p> Signup and view all the answers

    What is a key impact of engine balancing on engine components?

    <p>Reduced stress and vibration</p> Signup and view all the answers

    What is a modern development in engine balancing?

    <p>Active balancing systems</p> Signup and view all the answers

    What is a key factor in achieving effective engine balance?

    <p>Consistent manufacturing tolerances</p> Signup and view all the answers

    What is the primary reason engine balancing adds complexity to engine design and manufacturing?

    <p>Cost and production process considerations</p> Signup and view all the answers

    What is a key benefit of engine balancing in terms of performance?

    <p>Achieving higher RPMs more smoothly</p> Signup and view all the answers

    What is a key application of computational methods in engine balancing?

    <p>Understanding vibration characteristics</p> Signup and view all the answers

    Study Notes

    Classification of Automobiles

    • Automobiles are classified based on:
      • Load: Heavy Transport Vehicle (HTV), Light Transport Vehicle (LTV), etc.
      • Wheels: Two-wheeler, Three-wheeler, Four-wheeler, Six-wheeler, etc.
      • Fuel used: Petrol, Diesel, Electric, Steam, Gas, etc.
      • Body style: Sedan, Hatchback, Coupe, Station Wagon, Convertible, etc.
      • Transmission: Conventional, Semi-automatic, Automatic
      • Drive: Left-hand drive, Right-hand drive
      • Driving axle: Front-wheel drive, Rear-wheel drive, All-wheel drive

    Vehicle Construction and Components

    • Main components of an automobile:
      • Frame
      • Chassis
      • Body
      • Power unit
      • Transmission system
    • Frame: The skeleton of the vehicle
      • Types: Conventional, Semi-integral, Integral
    • Chassis: The underlying framework of the vehicle
      • Types: Body-on-Frame, Monocoque (Unibody), Backbone, Spaceframe, Platform

    Engine Components

    • Cylinder Block:
      • Main supporting structure for engine components
      • Cylinder head is mounted on top
      • Crankcase is provided at the bottom
    • Cylinder:
      • Cylindrical vessel or space for piston movement
      • Supported in the cylinder block
    • Piston:
      • Cylindrical component that fits into the cylinder
      • Forms the moving boundary of the combustion system
    • Combustion Chamber:
      • Space enclosed in the upper part of the cylinder
      • Fuel combustion takes place here
    • Inlet Manifold:
      • Pipe that connects the intake system to the inlet valve
      • Air or air-fuel mixture is drawn into the cylinder
    • Gudgeon Pin:
      • Forms the link between the small end of the connecting rod and the piston
    • Exhaust Manifold:
      • Pipe that connects the exhaust system to the exhaust valve
      • Products of combustion escape into the atmosphere
    • Inlet and Exhaust Valves:
      • Regulate the charge coming into the cylinder and the products of combustion
    • Connecting Rod:
      • Interconnects the piston and the crankshaft
      • Transmits the gas forces from the piston to the crankshaft
    • Crankshaft:
      • Converts the reciprocating motion of the piston into useful rotary motion
      • Enclosed in a crankcase

    Gasoline Engine

    • Basic parts of a gasoline engine:
      • Cylinder block
      • Piston
      • Piston rings
      • Piston pin
      • Connecting rod
      • Crankshaft
      • Cylinder head
      • Intake valve
      • Exhaust valve
      • Camshaft
      • Timing gears
      • Spark plug

    Advantages and Disadvantages of Diesel Engines

    • Advantages:
      • Better fuel economy
      • Longer engine life
    • Disadvantages:
      • Heavier and more expensive
      • Lower maximum RPM ranges
      • Must be fuel injected
      • Produce more smoke
      • Harder to start in cold weather
      • Noisier and tend to vibrate

    Multiple Cylinder Engines

    • Common configurations:
      • Inline engines (I2, I3, I4, I5, I6)
      • V engines (V6, V8, V10, V12)
      • Boxer (Flat) engines (F4, F6)
      • Rotary engines
    • Factors influencing engine configuration:
      • Vehicle size
      • Performance requirements
      • Fuel efficiency goals
      • Manufacturer preferences

    Engine Balancing

    • Importance of engine balancing:
      • Smooth operation
      • Minimize vibrations
      • Optimize performance
    • Types of engine balancing:
      • Primary balancing (reciprocating masses)
      • Secondary balancing (rotating masses)
    • Methods of balancing:
      • Balancing shafts
      • Counterweights
      • Engine layout optimization
    • Benefits of engine balancing:
      • Smooth operation
      • Improved reliability
      • Performance optimization
    • Considerations in balancing:
      • Engine speed and application
      • Manufacturing tolerances
      • Cost and complexity
    • Balancing techniques:
      • Dynamic balancing
      • Bobweight method
    • Modern developments:
      • Active balancing systems
      • Computational methods (CAD, simulation, CFD, FEA)

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    Learn about the classification of automobiles, including introduction to vehicles, and types of automobiles based on load and usage.

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