If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?

Related Mcqs:

1. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?

   A. same B. less C. more D. more or less depending on power rating E. unpredictable...

2. The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio

   A. Higher B. Lower C. Equal D. None of these Submitted by: Faheem Zaman Dhaunroo...

3. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?

   A. increase B. decrease C. remain unaffected D. increase/decrease depending upon engine capacity E. first increase and then decrease...

4. The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?

   A. more B. less C. same D. more upto some load and then less E. it may be less or more depending on several other factors...

5. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?

   A. increase B. decrease C. be independent D. may increase or decrease depending on other factors E. none of the above...

6. 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...

7. 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...

8. 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...

9. 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....

10. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?

    A. same B. less C. more D. variable E. more/less depending on engine capacity....