Ôn Tập Cuối Học Kì 2 Lớp 11

What is the smallest task of lubricating oil for internal combustion engines?

• Reduce friction.

• Cool the engine.

• Clean metal shavings.

• Seal small gaps.

When the forced lubrication system operates, what causes the lubricating oil to pass through the cooler?

• Due to oil pressure.

• Due to increased oil viscosity.

• Due to increased resistance of the control valve.

• Due to thermal contraction of the spring and ball in the control valve.

Which of the following statements is FALSE regarding the application of the Lubrication System (HTBT) on internal combustion engines?

• HTBT by mixing oil into fuel is arranged on two-stroke gasoline engines.

• HTBT by splash can be combined with forced lubrication on four-stroke engines.

• Forced HTBT is arranged on both two-stroke and four-stroke engines to lubricate parts on the engine block such as rocker arms, valves...

• Forced HTBT is commonly used on four-stroke engines such as motorcycles, cars...

How many inlets and outlets does the thermostat in the closed-loop water cooling system have?

• 1 inlet and 1 outlet.

• 2 inlets and 1 outlet.

• 1 inlet and 2 outlets.

• 2 inlets and 2 outlets.

When using lubricating oil for the engine, after a certain period of operation, it is necessary to change the lubricating oil for what reason?

• The lubricating oil is diluted.

• The lubricating oil is thickened.

• The lubricating oil is depleted.

• The lubricating oil is dirty and its viscosity is reduced.

After starting the engine, the cooling system has almost no effect to reduce the engine temperature, it is designed this way to ensure:

• Durability for the engine and cooling efficiency.

• The engine temperature quickly rises to the cooling temperature limit.

What is the purpose of working to reduce the engine temperature?

• Durability for the engine and cooling efficiency

• Engine temperature quickly rises to the cooling temperature limit

• The system only operates after the engine has been running for a while

• Save energy for the cooling system to operate stably

Which area on the internal combustion engine must be cooled?

• Area surrounding the exhaust gas outlet

• Area surrounding the crankcase

• Area surrounding the combustion chamber

• Area surrounding the intake

What is the task of the fuel and air supply system in a diesel engine?

• Provide clean fuel and air into the cylinder suitable for the engine's operating modes.

• Provide clean mixture into the engine cylinder suitable for the engine's operating modes.

• Provide gasoline, oil, and clean air into the cylinder suitable for the engine's operating modes.

• Provide diesel, oil, and clean air into the cylinder suitable for the engine's operating modes.

What is the role of the injector in the fuel system of a diesel engine?

• Filter out small dirt particles.

• Increase fuel pressure into the cylinder.

• Provide high-pressure fuel into the cylinder.

• Return excess fuel to the fuel tank.