Fuel systems for SI engines

 

TOTAL MECHANICAL ENGINEERING

Section 1	Section 2	Section 3	Section 4
Section 5	Section 6	Section 7	Section 8

Fuel systems for SI engines

Quiz

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1. The throttle valve controls the supply of
   1.   Air only
   2.   fuel only
   3.   air-fuel mixture
   4.   none of these
2. In carburetor lean mixture is required during
   1.   Idling
   2.   starting
   3.   accelerating
   4.   cruising
3. The choke is closed when the engine is
   1.   Accelerated
   2.   cold
   3.   hot
   4.   idling
4. Petrol engine employ
   1.   Quality governing
   2.   quantity governing
   3.   quality and quantity governing
   4.   none of these
5. In SI engine for maximum power the relative fuel-air ratio is
   1.   1.5
   2.   1.2
   3.   0.8
   4.   0.6
6. A simple carburetor supplies rich mixture during
   1.   Starting
   2.   idling
   3.   cruising
   4.   accelerating
7. During starting petrol engine require
   1.   Stochiometric mixture
   2.   lean mixture
   3.   rich mixture
   4.   any A:F ratio is ok
8. Advantages of fuel injection in SI engine is
   1.   Low initial cost
   2.   low maintenance requirement
   3.   increased volumetric efficiency
   4.   none of these
9. Stochiometric air-fuel ratio for a petrol engine is approximately
   1.   50:1
   2.   25:1
   3.   5:1
   4.   15:1
10. When the throttle is suddenly opened, the mixture from the simple carburetor tends to become
    1.   Rich
    2.   lean
    3.   stochiometric
    4.   not affected
11. Venturiin the carburetor results in
    1.   Increase in air velocity
    2.   decrease in air velocity
    3.   decrease of fuel flow
    4.   increase of manifold
12. For maximum thermal efficiency, the fuel-air mixture in SI engines should be
    1.   Lean
    2.   rich
    3.   stoichiometric
    4.   may be rich or lean
13. Economizer is used to provide enriched mixture during
    1.   Starting
    2.   idlig
    3.   cruising
    4.   full throttle operation
14. Modern carburetors provide the correct quality of air-fuel mixture during
    1.   Starting
    2.   idling
    3.   cruising
    4.   all conditions
15. Precise petrol injection system is
    1.   Direct injection
    2.   sequential injection
    3.   throttle body injection
    4.   port injection
16. The choke in automobile is meant for supplying
    1.   Lean mixture
    2.   rich mixture
    3.   stoichimetric mixture
    4.   weak mixture