250+ TOP MCQs on Fuel Injection In S.I. Engine and Answers

IC Engines Multiple Choice Questions on “Fuel Injection In S.I. Engine”.

1. The injection of fuel into a SI engine can be done by ___________
a) direct injection of fuel into the cylinder
b) injection of fuel close to the inlet valve
c) injection of fuel into the inlet manifold
d) all of the mentioned
Answer: d
Clarification: The injection of fuel into a SI engine can be done by
i) direct injection of fuel into the cylinder
ii) injection of fuel close to the inlet valve
iii) injection of fuel into the inlet manifold.

2. _____________ injection is adopted when manifold injection is contemplated.
a) Continuous
b) Timed
c) Continuous & Timed
d) None of the mentioned
Answer: a
Clarification: When manifold injection is contemplated, generally, continuous injection is adopted.

3. In _____________ injection, fuel is injected only during induction stroke over a limited period.
a) continuous
b) timed
c) continuous & timed
d) none of the mentioned
Answer: b
Clarification: Generally, in timed injection, fuel is injected only during induction stroke over a limited period.

4. Fuel injection in an SI engine _____________ volumetric efficiency.
a) increases
b) decreases
c) maintains constant
d) none of the mentioned
Answer: a
Clarification: Generally, the fuel injection in an SI engine increases volumetric efficiency.

5. By using fuel injection in an SI engine, better _____________ efficiency is obtained.
a) thermal
b) mechanical
c) unpredictable
d) none of the mentioned
Answer: a
Clarification: Better thermal efficiency is obtained, by using fuel injection in an SI engine.

6. By using fuel injection in an SI engine, lower _____________ is obtained.
a) exhaust emission
b) thermal efficiency
c) unpredictable
d) none of the mentioned
Answer: a
Clarification: Lower exhaust emission is obtained by using fuel injection in an SI engine.

7. Which is the most accurate gasoline injection system?
a) direct injection
b) port injection
c) throttle body injection
d) manifold injection
Answer: b
Clarification: Of all the gasoline injection system, the most accurate gasoline injection system is port injection.

8. What is the advantage of fuel injection in an SI engine?
a) low initial cost
b) low maintenance requirements
c) increased volumetric efficiency
d) none of the mentioned
Answer: c
Clarification: The main advantage of fuel injection in SI engine is increased volumetric efficiency.