2 Stroke Engines

What is a two-stroke engine?

• An engine that completes a power cycle with three strokes of the piston during only one crankshaft revolution.

• An engine that completes a power cycle with four strokes of the piston during only one crankshaft revolution.

• An engine that completes a power cycle with six strokes of the piston during only one crankshaft revolution.

• An engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution.

How does a two-stroke engine differ from a four-stroke engine?

• A two-stroke engine completes the combustion cycle in two strokes of the piston, while a four-stroke engine completes it in four strokes.

• A two-stroke engine has a higher fuel efficiency than a four-stroke engine.

• A two-stroke engine has a simpler design compared to a four-stroke engine.

• A two-stroke engine produces less pollution than a four-stroke engine.

What are the main components of a two-stroke engine?

• carburetor, exhaust pipe, fuel tank, air filter

• valve, camshaft, timing belt, intake manifold

• piston, cylinder, crankshaft, spark plug

• flywheel, connecting rod, oil pump, timing chain

What is the purpose of the crankcase in a two-stroke engine?

• To enclose the crankshaft and connecting rod and serve as a reservoir for lubricating oil.

• To reduce friction between moving parts.

• To regulate the flow of air into the engine.

• To provide a space for fuel combustion.

How does a two-stroke engine intake and exhaust gases?

• Through ports in the cylinder wall

• Through a carburetor.

• Through valves in the cylinder head.

• Through the piston rings.

What is the fuel-to-oil ratio typically used in two-stroke engines?

• 25:1

• 75:1

• 50:1

• 100:1

What are the advantages of a two-stroke engine?

• Lower fuel efficiency, more complex design with more moving parts, and lower torque at lower RPMs.

• Higher power-to-weight ratio, simpler design with fewer moving parts, and higher torque at lower RPMs.

What are the disadvantages of a two-stroke engine?

• Less reliability, reduced acceleration, and increased pollution.

• Limited torque, increased maintenance, and higher cost.

• Higher fuel consumption, higher emissions, and less power.

• Lower efficiency, more noise, and shorter lifespan.

How does a two-stroke engine lubricate its moving parts?

• By using a water-based lubricant.

• By using a separate oil reservoir.

• By relying on natural lubrication from the air.

• By mixing oil with the fuel

What are some common applications of two-stroke engines?

• Motorcycles, scooters, chainsaws, outboard motors, and small boats

• Airplanes and helicopters

• Lawnmowers and garden equipment

• Cars, trucks, and SUVs