Engine Fuel and Mixture Quiz
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Questions and Answers

What happens to the fuel in liquid form when it is drawn or injected into the engine cylinder?

  • It dissolves
  • It expands
  • It vaporizes (correct)
  • It solidifies

In light fuel oil engines, what is the governing method for the air/fuel mixture?

  • Vaporizing
  • Throttling (correct)
  • Injection
  • Compression ignition

What type of engines use heavy oil with higher viscosity and specific gravity?

  • Four-stroke engines
  • Low compression engines
  • High compression engines (correct)
  • Two-stroke engines

What causes the fuel to ignite in a compression ignition engine?

<p>High temperature developed during compression (B)</p> Signup and view all the answers

How is the output of a compression ignition engine governed?

<p>By throttling the air/fuel mixture (A)</p> Signup and view all the answers

What happens to the fuel in liquid form when it is drawn or injected into the engine cylinder?

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

In light fuel oil engines, what is the governing method for the air/fuel mixture?

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

What governs the output of a compression ignition engine?

<p>Varying the fuel quantity injected (D)</p> Signup and view all the answers

Which fuel is generally considered an environmentally clean alternative to other hydrocarbon fuels?

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

What is the measure of the fuel's resistance to premature detonation which causes engine knock?

<p>Octane rating (D)</p> Signup and view all the answers

What enhances gasoline to increase the octane rating?

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

What caused propane's use to drop for a while?

<p>Rising fuel prices and emission control modules issues (B)</p> Signup and view all the answers

Where is compressed methane extracted from natural gas usually stored for use in mobile engines?

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

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