Heat Engine Quiz

Which of the following statements describe the function of heat engine?

• It converts chemical energy to mechanical energy.

• It converts mechanical energy to chemical energy.

• It converts thermal energy to chemical energy.

• It converts thermal energy to mechanical energy.

What is the correct sequence of four cycle - stroke gasoline engine?

I.Compression II.Exhaust III.Intake IV.Power

• I,II,III,IV

• I,IV,II,III

• II,III,IV,I

• III,I,IV,II

In which stroke does the piston move upward?

• Compression and exhaust

• Compression and intake

• Exhaust and intake

• Exhaust and power

What happens to the gas if it is heated inside the engine cylinder?

• The gas molecules compress.

• The gas molecules expand.

• The gas molecules move closer to each other.

• The gas molecules decrease.

Which of the following processes occur in mixture of gases during compression stroke?

• Compressed into fractional amount

• Expelled out by the exhaust pipe

• Filled in the cylinder

• Ignited by the spark plug

What is the function of a spark plug? What is its effect on the mixture's temperature?

• It ignites the mixture and decreases the temperature of the mixture.

• It compresses the mixture and increases the temperature of the mixture.

• It ignites the mixture and increases the temperature of the mixture.

• It compresses the mixture and decreases the temperature of the mixture.

What happens to the piston and gases during power stroke?

• The piston moves up. No heat enters or leaves the system.

• The piston moves down. No heat enters or leaves the system.

• The piston moves up. Heat enters or leaves the system.

• The piston moves down. Heat enters or leaves the system.

In exhaust stroke, what happens to the piston and the mixture of gases?

• The piston moves down, the exhaust valve opens, and the burned gas expelled out through the exhaust valve.

• The piston moves up, the exhaust valve opens, and the burned gas expelled out through the exhaust valve.

• The piston moves down, the exhaust valve closes, and the burned gas expelled out through the exhaust valve.

• The piston moves up, the exhaust valve closes, and the burned gas expelled out through the exhaust valve.

Why is heat engine not 100% efficient?

• Because all mixture of gases is converted into work.

• Because all engines need to cool down.

• Because all of the gases are used up by the engine.

• Because some of the gases are taken up in the piston.

Which of the following is the effect of exhaust gas on the environment?

• Soil Pollution

• Air Pollution

• Water Pollution

• Noise Pollution