Internal Combustion Engine Fundamentals

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Questions and Answers

What directly applies force to a component in an internal combustion engine?

  • Low-temperature liquids
  • Electrical currents
  • Mechanical springs
  • High-temperature gases (correct)

Which stroke involves drawing air into the cylinder?

  • Expansion
  • Intake (correct)
  • Exhaust
  • Combustion

Which type of engine uses a spark plug?

  • Rotary engine
  • Spark-Ignition (SI) engine (correct)
  • Steam engine
  • Compression-Ignition (CI) engine

Which component connects the piston to the crankshaft?

<p>Connecting Rod (C)</p> Signup and view all the answers

What does 'bore' refer to in engine parameters?

<p>The diameter of the cylinder. (A)</p> Signup and view all the answers

In the Otto cycle, what process follows isentropic compression?

<p>Constant volume heat addition (B)</p> Signup and view all the answers

Which cycle is associated with diesel engines?

<p>Diesel Cycle (D)</p> Signup and view all the answers

How many strokes does a two-stroke engine complete in one revolution?

<p>Two (B)</p> Signup and view all the answers

What initiates combustion in spark-ignition engines?

<p>Spark plug (A)</p> Signup and view all the answers

What is the ideal air-fuel ratio for complete combustion called?

<p>Stoichiometric ratio (A)</p> Signup and view all the answers

Flashcards

Internal Combustion (IC) Engine

A heat engine where fuel combustion occurs with an oxidizer in a chamber that is part of the working fluid flow.

Thermodynamic Cycle (IC Engines)

The four processes that convert chemical energy into thermal energy, then into mechanical work. Common cycles include Otto and Diesel.

Engine Bore

The diameter of the engine cylinder.

Engine Stroke

Distance the piston travels in one direction inside the cylinder.

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Otto Cycle

Idealized thermodynamic cycle for spark-ignition engines involving isentropic compression, constant volume heat addition, isentropic expansion and constant volume heat rejection

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Diesel Cycle

Idealized thermodynamic cycle for compression-ignition engines involving isentropic compression, constant pressure heat addition, isentropic expansion and constant volume heat rejection

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Air-Fuel Ratio

Ratio of mass of air to mass of fuel in mixture, affects engine performance, emissions and fuel efficiency

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Torque

Turning force produced by the engine; key component of power.

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Gasoline Direct Injection (GDI)

Fuel injected directly into the cylinder for precise control and efficiency.

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Variable Valve Timing (VVT)

Optimizes valve timing based on engine conditions for better efficiency and performance.

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