Ulangan Online SiSTEM Pendingin 1

Explanation
The correct answer is "Sistem pendingin" (cooling system). A cooling system is necessary in a combustion engine to reduce the heat absorbed by its components, preventing damage to the motor. It also helps in regulating and stabilizing the working temperature of the motor.

Explanation
A thermostat is needed to regulate the temperature of the cooling water in the engine. It helps to speed up the warming process of the engine by allowing the coolant to circulate through the engine block when it is still cold. Once the engine reaches its optimal operating temperature, the thermostat will open and allow the coolant to flow through the radiator to cool down the engine. This helps to maintain the engine at a consistent and efficient temperature.

Explanation
The correct answer is 80 oC - 92 oC. This range of temperatures indicates the temperature at which the thermostat operates. When the temperature reaches 80 oC, the thermostat will turn on and start cooling the system until it reaches 92 oC, at which point it will turn off. This temperature range ensures that the system stays within a desired temperature range and prevents overheating.

Explanation
The securing tab is the only part mentioned that is not directly related to the functioning of the radiator. The pressure valve, bottom seal, pressure valve spring, and jiggle valve are all components that play a role in regulating the pressure and flow of coolant in the radiator. The securing tab, on the other hand, is used to secure or fasten the radiator in place, but it does not have a direct impact on the radiator's performance or functionality.

Explanation
When a vehicle is moving slowly, such as when climbing or in heavy city traffic, the cooling system may struggle to dissipate heat effectively. The radiator is responsible for cooling the engine coolant by transferring heat from the coolant to the air passing through it. Therefore, to prevent excessive heat buildup in the cooling system during slow driving conditions, the radiator needs to be equipped to efficiently cool the heated coolant.