The air-fuel ratio in petrol engines-is controlled by__________________? - PakMcqs

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1. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?

   A. lean mixture B. chemically correct mixture C. rich mixture D. unpredictable E. none of the above...

2. The air-fuel ratio of the petrol engine is controlled by__________________?

   A. fuel pump B. governor C. injector D. carburettor E. scavenging...

3. Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?

   A. Lean mixture B. Chemically correct fuel air ratio C. Rich mixture D. Unpredictable...

4. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

   A. lean mixture B. chemically correct mixture C. rich mixture D. unpredictable E. none of the above...

5. In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?

   A. 0.85 B. 1 C. 1.1 to 1.3 D. 1.2 to 1.5...

6. Diesel engines as compared to petrol engines require ______________________?

   A. bigger flywheel B. smaller flywheel C. same size flywheel D. no flywheel E. flywheel whose size may be less or more depending on several other fac-tors...

7. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?

   A. higher B. lower C. remain unaffected D. unpredictable E. none of the above...

8. Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?

   A. it is properly designed B. best quality fuel is used C. can not work as it is impossible D. flywheel size is proper E. engine cooling is stopped...

9. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

   A. not true B. true at full load C. true at part load D. true at both part and full load E. there could not be any such criterion...

10. Air fuel ratio at which a petrol engine can not work is_________________?

    A. 8 : 1 B. 10 : 1 C. 15 : 1 D. 20 : 1 and less E. will work at all ratios...