Internal Combustion Engines

Which stroke of the engine cycle is responsible for creating power?

• a) Intake

• b) Compression

• c) Power

• d) Exhaust

What is the role of the spark plug in an internal combustion engine?

• a) To open and close the intake valve

• b) To compress the air-fuel mixture

• c) To ignite the air-fuel mixture

• d) To push out the burnt gasses from the cylinder

Why is timing important in the engine cycle?

• a) It determines the number of cylinders in the engine

• b) It ensures synchronization between valves and pistons

• c) It controls the speed of the engine

• d) It determines the size of the cylinders

What happens during the compression stroke of the engine cycle?

• a) The intake valve opens and air-fuel mixture is drawn in

• b) The spark plug ignites the air-fuel mixture

• c) The piston moves up and compresses the air-fuel mixture

• d) The exhaust valve opens and burnt gasses are pushed out

What is the purpose of the exhaust stroke in the engine cycle?

• a) To compress the air-fuel mixture

• b) To ignite the air-fuel mixture

• c) To draw in the air-fuel mixture into the cylinder

• d) To push out the burnt gases from the cylinder

What is the correct sequence of the four strokes in the engine cycle?

• a) Intake, Compression, Power, Exhaust

• b) Compression, Power, Intake, Exhaust

• c) Power, Intake, Exhaust, Compression

• d) Exhaust, Intake, Power, Compression

How does the spark plug contribute to the engine's efficiency?

• a) By controlling the speed of the engine

• b) By providing the spark to ignite the air-fuel mixture

• c) By opening and closing the intake valve

• d) By pushing out the burnt gases from the cylinder

What can happen if the timing of the valves and pistons is incorrect?

• a) The engine will produce more power

• b) The engine will run more smoothly

• c) The engine may be damaged

• d) The engine will consume less fuel

During which stroke does the piston move downward while the intake valve is open?

• a) Intake

• b) Compression

• c) Power

• d) Exhaust

What is the primary purpose of the compression stroke in an engine cycle?

• a) To expel burnt gases

• b) To draw in the air-fuel mixture

• c) To compress the air-fuel mixture

• d) To ignite the air-fuel mixture