Working Cycles of Internal Combustion Engines

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How many strokes are required for the four-stroke cycle engine to produce one power stroke?

One
Four (correct)
Two
Three

During which stroke does the piston move upward, compressing the mixture in the combustion chamber?

Intake Stroke
Power Stroke
Exhaust Stroke
Compression Stroke (correct)

What is the purpose of the intake stroke in the four-stroke cycle engine?

To open the exhaust valve
To ignite the mixture in the combustion chamber
To compress the mixture in the combustion chamber
To draw a mixture of gasoline and air into the cylinder (correct)

What opens the inlet and exhaust valves in a four-stroke cycle engine?

Camshafts (C) Signup and view all the answers

Which type of internal combustion engines include two-stroke and four-stroke cycles?

Spark ignition engines (A) Signup and view all the answers

Which type of engine was developed before the two-stroke engine?

Four-stroke cycle engine (C) Signup and view all the answers

In the four-stroke cycle engine, which stroke is responsible for generating useful power?

Power Stroke (B) Signup and view all the answers

What function do the piston rings serve in a four-stroke engine?

To limit the amount of oil entering the combustion chamber (B) Signup and view all the answers

How is the lubrication of a two-stroke engine different from that of a four-stroke engine?

Four-stroke engines are lubricated by mixing oil with gasoline (A) Signup and view all the answers

What distinguishes a two-stroke engine from a four-stroke engine in terms of power output?

Two-stroke engines produce more power at low speeds (C) Signup and view all the answers

What is a notable difference in the working cycle of a two-stroke engine compared to a four-stroke engine?

Two-stroke engines produce a power stroke for every crankshaft revolution (C) Signup and view all the answers

What is the main difference in the method of intake between two-stroke and four-stroke engines?

Four-stroke engines draw in air and fuel through ports uncovered by the piston (D) Signup and view all the answers

What is a disadvantage of the four-stroke engine compared to a two-stroke engine?

It is more mechanically complex (A) Signup and view all the answers

How does the two-stroke engine lubricate its parts?

By mixing a special lubricating oil with the gasoline in the tank (B) Signup and view all the answers

Which part of the engine assists in pushing the exhaust gases through the exhaust port in a two-stroke engine?

Piston (A) Signup and view all the answers

Why does the two-stroke engine not produce twice as much power as a four-stroke engine of the same size and speed?

It is less efficient at exhaust gas scavenging (C) Signup and view all the answers

What is a notable characteristic of the two-stroke cycle engine?

Functions by utilizing three openings in its cylinder wall (B) Signup and view all the answers

Which statement describes the impact of the piston movement in a two-stroke engine?

The upward movement of the piston uncovers exhaust port E, which releases cylinder pressure and discharges most of the burned gases (C) Signup and view all the answers

What is the function of spark plug G in the two-stroke cycle engine?

To ignite the compressed mixture near the upper end of the stroke (B) Signup and view all the answers

What is a distinguishing feature of the four-stroke engine?

'Produces good fuel economy and high torque at low speeds' (C) Signup and view all the answers