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________________?

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. 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...

3. 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...

4. With increase in engine speed, the ignition of spark in petrol engine has to be __________________?

   A. Unaltered B. Increased C. Decreased D. Advanced...

5. The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?

   A. higher B. lower C. same D. depends on size of engine E. unpredictable....

6. 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...

7. 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...

8. 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...

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

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

10. Air fuel ratio for idling speed of a petrol engine is approximately_________________?

    A. 1 : 1 B. 5 : 1 C. 10:1 D. 15 : 1 E. 20 : 1...