250+ TOP MCQs on Fuel Injector and Answers

IC Engines Multiple Choice Questions on “Fuel Injector”.

1. Quick and complete combustion is ensured by a well designed _____________
a) governor
b) fuel injector
c) throttle
d) none of the mentioned
Answer: a
Clarification: Generally, quick and complete combustion is ensured by a well designed fuel injector.

2. By atomizing the fuel into very fine droplets, it _____________ the surface area of the fuel droplets.
a) increases
b) decreases
c) unpredictable
d) none of the mentioned
Answer: a
Clarification: When the fuel is atomized into very fine droplets, it increases the surface area of the fuel droplets.

3. _____________ is done by forcing the fuel through a small orifice under high pressure.
a) Vacuum
b) Atomization
c) Carburation
d) None of the mentioned
Answer: b
Clarification: Generally, atomization is done by forcing the fuel through a small orifice under high pressure.

4. The injector assembly consists of ___________
a) a needle valve
b) a compression spring
c) a nozzle and an injector body
d) all of the mentioned
Answer: d
Clarification: The injector assembly consists of
i) a needle valve
ii) a compression spring
ii) a nozzle
iv) an injector body.

5. When the fuel is supplied by the injection pump, it exerts sufficient force against the spring to lift the ___________
a) nozzle valve
b) throttle valve
c) mechanical valve
d) none of the mentioned
Answer: a
Clarification: When the fuel is supplied by the injection pump, it exerts sufficient force against the spring to lift the nozzle valve as only through nozzle the fuel is sprayed.

6. _____________ is sprayed into the combustion chamber in a finely atomized particles.
a) Air
b) Fuel
c) Water
d) None of the mentioned
Answer: b
Clarification: Generally, fuel is sprayed into the combustion chamber in finely atomized particles.

7. The spring tension and the valve opening pressure is controlled by adjusting the screw provided at the ___________
a) top
b) bottom
c) center
d) none of the mentioned
Answer: a
Clarification: None.

8. For proper lubrication between the nozzle valve and its guide a small quantity of fuel is allowed to leak through the clearance.
a) True
b) False
Answer: a
Clarification: None.