Session 4: Testing of Cooling System and Replacement of Defective Component
Module 2: Serviceability, Replacement or Repair of Engine Components
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The primary purpose of the cooling system in an internal combustion engine is to prevent ………………Ans: overheating of the engine.
2. The cooling system is responsible for removing approximately……………..% of the heat generated during the engine’s power stroke.
Ans: 30%.
3. The radiator is responsible for dissipating heat and cooling downthe ……………..
Ans: coolant.
4. The component responsible for regulating coolant flow based onengine temperature is called the …………………..
Ans: thermostat.
Multiple Choice Questions
1. What is the primary function of the cooling system in an internal combustion engine?
A) Increase engine efficiency
B) Enhance fuel combustion
C) Prevent overheating
D) Improve exhaust emissions
Ans: C) Prevent overheating
2. During which stroke of the internal combustion engine, the highesttemperature typically occurs?
A) Power stroke
B) Compression stroke
C) Exhaust stroke
D) Intake stroke
Ans: A) Power stroke
3. What is one of the potential consequences of high engine temperatures?
A) Improved fuel efficiency
B) Reduced exhaust emissions
C) Increased lubricant viscosity
D) Enhanced engine performance
Ans: C) Increased lubricant viscosity
4. What is the purpose of the cooling fan in the cooling system?A) Increase engine power
B) Enhance exhaust flow
C) Improve fuel combustion
D) Disperse heat and maintain engine temperature
Ans: D) Disperse heat and maintain engine temperature
Answer the following questions
Q1. Why the cooling system is important in IC Engine?
Ans: The cooling system is important because it prevents overheating, maintains proper engine temperature, reduces wear of engine parts, and ensuresefficient and safe engine operation.
Q2. Name the different component of cooling system.
Ans: Radiator, water pump, thermostat, cooling fan, radiator cap, hoses, coolant, and engine water jackets.
Q3. Name the different methods of engine cooling.
Ans: Air cooling system and water or liquid cooling system.
Q4. Difference between oil cooling system and water-cooling system.
Ans: In an oil cooling system, engine oil absorbs and carries away heat from engine parts, while in a water-cooling system, coolant circulates throughthe engine and radiator to remove heat more effectively.
Q5. What is the function of radiator in cooling system?
Ans: The radiator dissipates heat from the hot coolant into the atmosphereand helps in cooling the coolant before it is recirculated to the engine.
Q6. Why coolant is added in the radiator?
Ans: Coolant is added to improve heat transfer, prevent freezing in coldweather, avoid boiling in high temperature, and protect engine parts fromcorrosion.
Q7. What is the function of thermostats?
Ans: The thermostat controls the flow of coolant according to enginetemperature and helps the engine reach and maintain its optimum operatingtemperature.
Q8. What is the function of water pump and cooling fan?Ans: The water pump circulates coolant through the engine and radiator, while the cooling fan helps in removing heat from the radiator, especially at low vehicle speed.
Activity
Exercise: Assignment
1. Make a list of common faults in cooling systemAns:
S. No. Fault
1. Coolant leakage
2. Overheating of engine
3. Radiator blockage
4. Thermostat failure
5. Make a poster showing water/fluid cooling system of any vehicleand label all the components.
Ans: The poster should include and label the radiator, water pump, thermostat, cooling fan, radiator cap, hoses, engine block, and coolant passages.
Try yourself.
