Session 6: Servicing of CRDI and Non CRDI System
Module 2: Serviceability, Replacement or Repair of Engine Components
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The main purpose of a Common Rail Direct Injection (CRDI)system is to inject fuel directly into the ……………
Ans: combustion chamber.
2. A turbocharger increases engine power by forcing more…………… into the combustion chamber.
Ans: air.
3. The Electronic Control Module (ECM) is responsible forcontrolling the …………… of the diesel engine.
Ans: fuel injection and engine operation.
4. The role of a fuel injector nozzle is to spray fuel into the cylinderin …………… form for proper combustion.
Ans: atomized.
Multiple Choice Questions
1. What is the main function of a Common Rail Direct Injection(CRDI) system in a diesel engine?
a) Controlling the engine speed
b) Storing fuel
c) Filtering air for combustion
d) Injecting fuel into the cylinder
Ans: d) Injecting fuel into the cylinder
2. What is the purpose of a turbocharger in an engine?
a) Increase the size of the engine
b) Improve fuel efficiency
c) Generate electricity
d) Force more air into the combustion chamber
Ans: d) Force more air into the combustion chamber
3. What is the role of the Electronic Control Module (ECM) in adiesel engine’s fuel supply system?
a) Filtering the fuel
b) Storing excess fuel
c) Controlling the engine speed
d) Injecting fuel into the cylinder
Ans: c) Controlling the engine speed
4. What is the purpose of a fuel injector nozzle in a diesel engine?a) Storing excess fuel
b) Controlling the engine speed
c) Filtering the fuel
d) Spraying fuel into the cylinder in an atomized form
Ans: d) Spraying fuel into the cylinder in an atomized formAnswer the following questions
1. What is the full form of CRDI?
Ans: Common Rail Direct Injection.
2. What are the main components of CRDI?
Ans: Fuel tank, low-pressure fuel pump, high-pressure pump, commonrail, fuel injectors, sensors, and Electronic Control Module.
3. What are the advantages of CRDI over Conventional Diesel system?
Ans: CRDI provides better fuel efficiency, higher engine power, smoother engine operation, reduced noise, and lower exhaust emissions.
4. What are the disadvantages of CRDI over Conventional Diesel system?
Ans: CRDI system is expensive, sensitive to fuel quality, and requiresskilled technicians for maintenance and repair.
5. What precaution to be taken while working on CRDI system?
Ans: High fuel pressure must be released, battery should be disconnected, clean fuel and tools must be used, and safety guidelines should be strictlyfollowed.
6. Explain the use of turbo charger.
Ans: A turbocharger uses exhaust gas energy to compress intake air, allowing more air into the combustion chamber, which increases engine powerand efficiency
Activity
1. Make a list of components of CRDI system
Ans:
S. No. Advantage
1. Fuel tank
2. High-pressure fuel pump
3. Common rail
4. Fuel injector
5. Make a poster showing CRDI system and its components
Ans: The poster should show and label the fuel tank, fuel pump, commonrail, injectors, sensors, ECM, and fuel lines clearly.
Try yourself.
