Fuel system in CI engines

 

TOTAL MECHANICAL ENGINEERING

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

Fuel system in CI engines

Quiz

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1. Advantages of air injection system is
   1.   Cheaper fuels can be used
   2.   MEP is high
   3.   fine atomization and distribution of fuel
   4.   all of these
2. Commonly used injection system in automobiles is
   1.   Air injection
   2.   solid injection
   3.   combination of (a) and (b)
   4.   none of these
3. Fuel injection pressure in solid injection system is around
   1.   < 10 bar
   2.   10-20 bar
   3.   30-50 bar
   4.   200-250 bar
4. Fuel filters do not use generally
   1.   Paper
   2.   oil
   3.   cloth
   4.   felt
5. Fuel is injected in a four stroke CI engine
   1.   At the end of suction stroke
   2.   At the end of expansion stroke
   3.   at the end of compression stroke
   4.   at the end of exhaust stroke
6. Injector system in which the pump and the injector nozzle is combined in one housing is known as
   1.   Common rail system
   2.   distributor system
   3.   unit injector system
   4.   individual pump and nozzle system
7. Main advantage of pintaux nozzle is
   1.   Better cold starting
   2.   ability to distribute fuel
   3.   good penetration
   4.   good atomization
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. Multi-point fuel injection system uses
   1.   Direct injection
   2.   port injection
   3.   throttle body injection
   4.   both (b) and (c)
10. D-MPFI system uses
    1.   Port injection
    2.   manifold injection
    3.   direct injection
    4.   throttle body injection
11. L-MPFI system uses
    1.   Port injection
    2.   manifold injection
    3.   direct injection
    4.   throttle body injection
12. Common rail injection system uses injection pressures of the order
    1.   100-200 bar
    2.   200-400 bar
    3.   400-600 bar
    4.   1500 bar
13. Continuous injection system usually has
    1.   Plunger pump
    2.   rotary pump
    3.   gear pump
    4.   vane pump
14. ECU is an electronic injection system used for
    1.   Calculating the appropriate injection timing
    2.   Meeting only certain operating conditions
    3.   closing the injection valve only
    4.   none of these
15. With EFI of diesel engines
    1.   Sharp start and stop is not possible
    2.   Very high injection pressure can be obtained
    3.   sudden cylinder cut-off is impossible
    4.   diagnostic properties are poor
16. EFI system can achieve
    1.   Proper injection timing
    2.   proper injection quantity
    3.   proper injection pressure
    4.   all of these
17. The cold start injector
    1.   Maintain stoichiometric air-fuel ratio
    2.   Provides lean air-fuel ratio
    3.   gives rich air-fuel ratio
    4.   is not used for any of the above functions