1) Which one of the following fuel injection systems was originally used in large stationary and marine engines and is now seldom used?
A. Air injection
B. Airless injection
C. Mechanical injection
D. Solid injection
Quick Revision Notes
Fuel Injection System: Important AMVI Points
💨 Air Injection
Old system used compressed air to inject fuel. It was used in large stationary and marine engines.
Now seldom used
⛽ Solid Injection
Fuel is injected directly by high pressure without compressed air. Common in modern diesel engines.
Also called airless injection
🔥 Injection Timing
In a C.I. engine, fuel is injected near the end of compression stroke when piston approaches TDC.
Remember: Compression end
🧪 Fuel Filter
Fuel filter removes dirt and protects the injector pump and injector from damage.
Clean fuel = better injection
Exam Shortcut Flow
Fuel tank → primary fuel filter → fuel feed pump → fine fuel filter → fuel injection pump → injector → combustion chamber.
AMVI Mock Tests and AMVI Previous Questions usually ask this topic as direct questions from fuel injection system advantages, disadvantages and timing.
AMVI Expected MCQs
Practice Questions with Answer Reveal
2) In a C.I. engine, the fuel is injected when the piston:
A. Is approaching TDC at the end of compression stroke
B. Has just passed TDC at the end of induction stroke
C. Is approaching BDC at the end of induction stroke
D. Has just passed BDC at the start of compression stroke
3) Which one of the following in a diesel engine fuel system is located just before the injector?
A. Fuel pump
B. Fuel tank
C. Fuel filter
D. Lift pump
4) Airless injection is also commonly known as:
A. Carburettor injection
B. Solid injection
C. Spark injection
D. Air blast injection
5) The main disadvantage of air injection system is:
A. It requires a compressor
B. It reduces engine weight
C. It requires a spark plug
D. It works only with petrol
6) In a diesel engine, the charge compressed during compression stroke is:
A. Petrol-air mixture
B. Diesel-air mixture
C. Air only
D. Exhaust gas only
7) The function of fuel injector in a diesel engine is to:
A. Store fuel
B. Atomize and spray fuel into combustion chamber
C. Cool the engine oil
D. Filter air
8) Which component delivers fuel from the tank towards the injection system?
A. Lift pump / feed pump
B. Radiator
C. Flywheel
D. Exhaust valve
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Yes. Fuel injection timing, air injection disadvantages, solid injection and fuel filter functions are frequently asked direct concepts.
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