250+ TOP MCQs on Systems In Modern Carburetors and Answers

IC Engines Multiple Choice Questions on “Systems In Modern Carburetors”.

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1. An SI engine sometimes continues to run for a very small period even after the ignition is switched off. This phenomenon is called?
a) idling
b) dieseling
c) throttling
d) none of the mentioned
Answer: b
Clarification: Dieseling is the phenomenon in which an SI engine sometimes continues to run for a very small period even after the ignition is switched off.

2. Dieseling may take place due to ___________
a) engine idling speed set to high
b) increase in compression ratio due to carbon deposits
c) inadequate or low octane rating
d) all of the mentioned
Answer: d
Clarification: Dieseling may take place due to engine idling speed set to high, increase in compression ratio due to carbon deposits, inadequate or low octane rating, engine overheating, too high spark plug heat range, incorrect adjustment of idle fuel-air mixture, sticking of throttle, requirement of tune up of engine and oil entry into the cylinder.

3. Dieseling may take place due to ___________
a) engine overheating
b) too high spark plug heat range
c) incorrect adjustment of idle fuel-air mixture
d) all of the mentioned
Answer: d
Clarification: Dieseling may take place due to engine idling speed set to high, increase in compression ratio due to carbon deposits, inadequate or low octane rating, engine overheating, too high spark plug heat range, incorrect adjustment of idle fuel-air mixture, sticking of throttle, requirement of tune up of engine and oil entry into the cylinder.

4. Dieseling may take place due to ___________
a) sticking of throttle
b) requirement of tune up of engine and oil entry into the cylinder
c) none of the mentioned
d) all of the mentioned
Answer: d
Clarification: Dieseling may take place due to engine idling speed set to high, increase in compression ratio due to carbon deposits, inadequate or low octane rating, engine overheating, too high spark plug heat range, incorrect adjustment of idle fuel-air mixture, sticking of throttle, requirement of tune up of engine and oil entry into the cylinder.

5. The solenoid valve operated idling circuit reduces ___________
a) engine performance
b) hydrocarbon emissions
c) co emissions
d) none of the mentioned
Answer: b
Clarification: None.

6. In order to accelerate the vehicle and consequently its engine, the mixture required is very ___________
a) rich
b) lean
c) thin
d) none of the mentioned
Answer: a
Clarification: Generally, in order to accelerate the vehicle and consequently its engine, the mixture required is very rich.

7. An economizer valve opens at ______________ throttle operation.
a) half
b) full
c) partial
d) none of the mentioned
Answer: b
Clarification: An economizer valve, generally opens at full throttle operation.

8. Economizer is also known as ___________
a) power enrichment system
b) power less system
c) power throttle system
d) none of the mentioned
Answer: a
Clarification: Another name for economizer is power enrichment system.

9. Economizer allows a large opening to the main jet when the throttle is ____________ beyond a specified limit.
a) closed
b) opened
c) partially opened
d) none of the mentioned
Answer: b
Clarification: None.

10. The metering rod used in an economizer ___________
a) is tapered
b) is not tapered
c) may be tapered
d) none of the mentioned
Answer: c
Clarification: None.