WorksheetsInternal Combustion Engine Quiz
Total questions: 10
Worksheet time: 8mins
During which stroke in a four-stroke SI engine does the compression of the air-fuel mixture occur, and what is the position of the valves?
Compression stroke; both valves closed
Power stroke; both valves open
Suction stroke; inlet valve open, exhaust valve closed
Exhaust stroke; both valves open
Explain why pressure and temperature increase during the compression stroke in a four-stroke SI engine. Use evidence from the process described.
Because the air-fuel mixture is compressed at constant volume, leading to increased pressure and temperature
Because the valves are open, allowing more air to enter
Because the piston moves away from TDC, reducing pressure
Because combustion occurs before compression
During the power stroke of a four-stroke SI engine, what happens to the pressure and temperature inside the cylinder, and why?
Both decrease due to combustion of fuel
Both increase due to compression
Both remain constant as the valves are open
Both decrease as the piston moves towards TDC
During the suction stroke of a four-stroke compression ignition engine, what happens inside the cylinder?
Fuel is injected and combustion occurs.
Air is sucked alone as vacuum is created by piston movement.
Both valves are closed and air is compressed.
Exhaust gases are expelled through the exhaust valve.
Explain how the design of the transfer port can achieve the same objective as a piston deflector in a two-stroke SI engine.
By increasing the engine speed
By properly shaping the transfer port to direct the fresh charge away from the exhaust port
By reducing the fuel consumption
By increasing the size of the exhaust port
What is the sequence of piston movement during the compression and expansion strokes in a two-stroke CI engine?
From BDC to TDC during compression, and from TDC to BDC during expansion.
From TDC to BDC during compression, and from BDC to TDC during expansion.
From BDC to TDC during both strokes.
From TDC to BDC during both strokes.
Explain why pressurized air is used in the inlet port of a two-stroke CI engine and how it affects the combustion process.
It helps expel combustion gases and ensures efficient combustion.
It cools the engine and reduces fuel consumption.
It increases the engine's weight and reduces efficiency.
It prevents the piston from moving.
Analyze the impact of the induction time on volumetric efficiency in four-stroke and two-stroke engines. Which engine type generally has higher volumetric efficiency and why?
Two-stroke engines, because they have more power strokes.
Four-stroke engines, because they have more time available for induction of charge.
Two-stroke engines, because they have ports instead of valves.
Four-stroke engines, because they have lighter flywheels.
What is the typical range of compression ratios for SI and CI engines, respectively?
6 to 10 for SI engines; 16 to 20 for CI engines.
16 to 20 for SI engines; 6 to 10 for CI engines.
Both have compression ratios from 6 to 10.
Both have compression ratios from 16 to 20.
Which cycle is used in SI engines and which in CI engines?
Otto cycle in SI engines; Diesel cycle in CI engines.
Diesel cycle in SI engines; Otto cycle in CI engines.
Both use Otto cycle.
Both use Diesel cycle.
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