A stoichiometric air-fuel ratio is______________________? - PakMcqs

Related Mcqs:

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. 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...

3. 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...

4. 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...

5. 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...

6. Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio__________________?

   A. lean mixture has high reaction time B. rich mixture has high reaction time C. chemically correct mixture has mini-mum reaction time D. all of the above E. non of the above...

7. The theoretically correct air fuel ratio for petrol engine is of the order of___________________?

   A. 6 : 1 B. 9 : 1 C. 12 : 1 D. 15 : 1 E. 20 : 1...

8. 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...

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

   A. controlling valve opening/closing B. governing C. injection D. carburettion E. scavenging and supercharging...

10. 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...