McqMate
Chapters
1. |
Advantage of gaseous fuel is that |
A. | it can be stored easily |
B. | it can mix easily with air |
C. | it can displace more air from the engine |
D. | all of the above |
Answer» B. it can mix easily with air |
2. |
Paraffins are in general represented by |
A. | CnHn |
B. | CnH2n |
C. | CnH2n+2 |
D. | CnH2n-6 |
Answer» C. CnH2n+2 |
3. |
Paraffins have molecular structure of |
A. | chain saturated |
B. | chain unsaturated |
C. | ring saturated |
D. | ring unsaturated |
Answer» A. chain saturated |
4. |
Olefins are represented by the formula |
A. | CnH2n |
B. | CnH2n+2 |
C. | CnH2n-4 |
D. | CnH2n-6 |
Answer» A. CnH2n |
5. |
Hydrocarbons are decomposed into smaller hydrocarbons by |
A. | reforming |
B. | refining |
C. | cracking |
D. | polymerization |
Answer» C. cracking |
6. |
The molecular structure of the straight-run gasoline is changed by |
A. | cracking |
B. | reforming |
C. | reining |
D. | boiling |
Answer» B. reforming |
7. |
For SI engines fuels most preferred are |
A. | aromatics |
B. | parafins |
C. | olefins |
D. | napthenes |
Answer» A. aromatics |
8. |
For CI engine fuels most preferred are |
A. | napthenes |
B. | paraffins |
C. | olefins |
D. | aromatics |
Answer» B. paraffins |
9. |
Octane number of iso-octane is |
A. | 0 |
B. | 30 |
C. | 60 |
D. | 100 |
Answer» D. 100 |
10. |
Ignition quality of diesel fuel is indicated by its |
A. | octane number |
B. | cetane number |
C. | fash point |
D. | fire point |
Answer» B. cetane number |
11. |
Flash point of fuel oil is |
A. | minimum temperature to which1 oil is heated in order to give off inflammable vapours in Sufficient quantity to ignite momentarily when brought in contact with a flame |
B. | temperature at which it solidifies or congeals |
C. | temperature at which it catches fire without external aid |
D. | indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off |
Answer» A. minimum temperature to which1 oil is heated in order to give off inflammable vapours in Sufficient quantity to ignite momentarily when brought in contact with a flame |
12. |
Gasohol is a mixture of |
A. | 90% ethanol + 10% gasoline |
B. | 10% ethanol +90% gasoline |
C. | 40% ethanol + 60% gasoline |
D. | 50% ethanol +50% gasoline |
Answer» B. 10% ethanol +90% gasoline |
13. |
Stoichiometric air-fuel ratio of petrol is roughly |
A. | 50:1 |
B. | 25:1 |
C. | 15:1 |
D. | 1:1 |
Answer» C. 15:1 |
14. |
Venturi in the carburetor results in |
A. | decrease of air velocity |
B. | increase of air velocity |
C. | decrease of fuel flow |
D. | increase of manifold vacuum |
Answer» B. increase of air velocity |
15. |
The choke is closed when the engine is |
A. | accelerating |
B. | hot |
C. | cold |
D. | idling |
Answer» C. cold |
16. |
Lean air mixture is required during |
A. | idling |
B. | starting |
C. | accelerating |
D. | cruising |
Answer» D. cruising |
17. |
The limits of air-fuel for SI engine are |
A. | 8/1 to 18/1 |
B. | 8/1 to 50/1 |
C. | 25/1 to 50/1 |
D. | 50/1 to 100/1 |
Answer» A. 8/1 to 18/1 |
18. |
For maximum thermal efficiency, the fuel-air mixture in SI engines should be |
A. | lean |
B. | rich |
C. | stoichiometric |
D. | may be rich or lean |
Answer» A. lean |
19. |
During starting petrol engines require |
A. | stoichiometric mixture |
B. | lean mixture |
C. | rich mixture |
D. | any air-fuel ratio is alright |
Answer» C. rich mixture |
20. |
Economizer is used to provide enriched mixture during |
A. | Starling |
B. | idling |
C. | cruising |
D. | full throttle operation |
Answer» D. full throttle operation |
21. |
When the throttle is suddenly opened, the mixture of the simple carburetor tends to become |
A. | rich |
B. | lean |
C. | stoichiometric |
D. | not affected |
Answer» B. lean |
22. |
Precise petrol injection system is |
A. | direct injection |
B. | sequential injection |
C. | throttle body injection |
D. | port injection |
Answer» C. throttle body injection |
23. |
The choke in an automobile meant for supplying |
A. | lean mixture |
B. | rich mixture |
C. | stoichiometric mixture |
D. | weak mixture |
Answer» B. rich mixture |
24. |
Modern carburetors provide the correct quality of air-fuel mixture during |
A. | starting |
B. | idling |
C. | cruising |
D. | all conditions |
Answer» D. all conditions |
25. |
A simple carburetor supplies rich mixture during |
A. | starting |
B. | idling |
C. | cruising |
D. | accelerating |
Answer» D. accelerating |
26. |
Fuel injector is used for |
A. | gas engines |
B. | CI engines |
C. | SI engines |
D. | none of the above |
Answer» B. CI engines |
27. |
Advantage of air injection system is |
A. | cheaper fuels can be used |
B. | mep is high |
C. | fine atomization and distribution of the fuel |
D. | all of the above |
Answer» D. all of the above |
28. |
Commonly used injection system in automobiles is |
A. | air injection |
B. | solid injection |
C. | combination of (a) and (b) |
D. | none of the above |
Answer» B. solid injection |
29. |
Fuel injection pressure in solid injection system is around |
A. | <10 bar |
B. | 10-20 bar |
C. | 30-50 bar |
D. | 200-250 bar |
Answer» D. 200-250 bar |
30. |
Fuel filters do not use generally |
A. | oil |
B. | paper |
C. | cloth |
D. | felt |
Answer» B. paper |
31. |
Fuel is injected in a four-stroke CI engine |
A. | at the end of suction stroke |
B. | at the end of expansion stroke |
C. | at the end of compression stroke |
D. | at the end of exhaust stroke |
Answer» C. at the end of compression stroke |
32. |
Injection system in which the pump and the injector nozzle is combined in one housing is known as |
A. | common rail system |
B. | distributor system |
C. | unit injector system |
D. | individual pump and nozzle system |
Answer» C. unit injector system |
33. |
Main advantage of pintaux nozzle is |
A. | better cold starting performance |
B. | ability to distribute the fuel |
C. | good penetration |
D. | good atomization |
Answer» A. better cold starting performance |
34. |
the most accurate gasoline injection system is |
A. | direct injection |
B. | port injection |
C. | throttle body injection |
D. | manifold injection |
Answer» B. port injection |
35. |
Advantage of fuel injection in SI engine is |
A. | low initial cost |
B. | low maintenance requirements |
C. | increased volumetric efficiency |
D. | none of the above |
Answer» C. increased volumetric efficiency |
36. |
‘MPFI’ stands for |
A. | Multi point fuel injection |
B. | Multi port fuel injection |
C. | Manifold point fuel injection |
D. | Manifold port fuel injection |
Answer» A. Multi point fuel injection |
37. |
In carburetor, Choke is incorporated |
A. | Before the venturi |
B. | After the venturi |
C. | In the venturi |
D. | Any of the above |
Answer» A. Before the venturi |
38. |
The following factors affect the process of carburetion |
A. | Engine speed |
B. | The temperature of incoming air |
C. | The volatility of fuel |
D. | All of the above |
Answer» D. All of the above |
39. |
In MPFI _____ is used to spray fuel into engine. |
A. | Engine vacuum |
B. | Suction pressure of engine |
C. | Electric pump |
D. | None of the above |
Answer» B. Suction pressure of engine |
40. |
L-MPFI system uses |
A. | port injection |
B. | direct injection |
C. | manifold injection |
D. | throttle body injection |
Answer» A. port injection |
41. |
D-MPFI system uses |
A. | port injection |
B. | manifold injection |
C. | direct injection |
D. | throttle body injection |
Answer» B. manifold injection |
42. |
Common rail injection system uses injection pressures of the order |
A. | 100-200 bar |
B. | 200-400 bar |
C. | 400-600 bar |
D. | 1500 bar |
Answer» D. 1500 bar |
43. |
Continuous injection system usually has |
A. | plunger pump |
B. | rotary pump |
C. | gear pump |
D. | vane pump |
Answer» B. rotary pump |
44. |
The cold start injector |
A. | maintain stoichiometric air-fuel ratio |
B. | provides lean air-fuel ratio |
C. | gives rich air-fuel ratio |
D. | is not used for any of the above functions |
Answer» C. gives rich air-fuel ratio |
45. |
ECU is an electronic injection system used for |
A. | calculating the appropriate injection timing |
B. | meeting only certain operating conditions |
C. | closing the injection valve only |
D. | none of the above |
Answer» A. calculating the appropriate injection timing |
46. |
With EFI (ELECTRONIC FUEL INJECTION) of diesel engines |
A. | sharp start and stop is not possible |
B. | very high injection pressure can be obtained |
C. | sudden cylinder cut-off is impossible |
D. | diagnostic properties are poor |
Answer» B. very high injection pressure can be obtained |
47. |
EFI system can achieve |
A. | proper injection timing |
B. | proper injection quantity |
C. | proper injection pressure |
D. | all of the above |
Answer» D. all of the above |
48. |
The first vehicle in India equipped with MPFI system in Indian automobile industry |
A. | Tata Indica |
B. | Daewoo Matiz |
C. | Maruti Alto |
D. | Chevrolet spark |
Answer» B. Daewoo Matiz |
49. |
The fuel in diesel engine is normally injected at pressure of |
A. | 5-10 kg/cm2 |
B. | 20-25 kg/cm2 |
C. | 60-80 kg/cm2 |
D. | 90-130 kg/cm2 |
Answer» D. 90-130 kg/cm2 |
50. |
The specific fuel consumption per BHP hour for diesel engine is approximately |
A. | 0.15 kg |
B. | 0.2 kg |
C. | 0.25 kg |
D. | 0.3 kg |
Answer» B. 0.2 kg |
51. |
The specific fuel consumption per BH hour for a petrol engine is approximately |
A. | 0.15 kg |
B. | 0.2 kg |
C. | 0.25 kg |
D. | 0.3kg |
Answer» C. 0.25 kg |
52. |
The air-fuel ratio of the petrol engine is controlled by |
A. | fuel pump |
B. | governor |
C. | injector |
D. | carburettor |
Answer» D. carburettor |
53. |
Pour point of fuel oil is the |
A. | minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame |
B. | temperature at which it solidifies or congeals |
C. | it catches fire without external aid |
D. | indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off |
Answer» B. temperature at which it solidifies or congeals |
54. |
A 5 BHP engine running at full load would consume diesel of the order of |
A. | 0.3 kg/hr |
B. | 1 kg/hr |
C. | 3 kg/hr |
D. | 5 kg/hr |
Answer» B. 1 kg/hr |
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