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

Related Mcqs:

1. 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

2. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?

   A. same
   B. more
   C. less
   D. less or more depending on operating conditions
   E. unpredictable

3. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?

   A. 5:25:30:50
   B. 25:35:5:35
   C. 25:5:10:60
   D. 40:30:15:15
   E. 25:5:35:35

4. 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

5. 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

6. A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?

   A. uniform throughout the mixture
   B. chemically correct mixture
   C. about 3-5% rich mixture
   D. about 10% rich mixture
   E. about 10% lean mixture

7. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?

   A. 250°C
   B. 500°C
   C. 1000°C
   D. 150CPC
   E. 2000°C

8. High carbon content in diesel oil used for diesel engine leads to_________________?

   A. production of highly corrosive gases corroding the cylinder walls and exhaust system
   B. excessive engine wear
   C. damaging of both the storage tank and the engine
   D. deposition on engine parts
   E. none of the above.

9. The pressure at the end of compression in the case of diesel engine is of the order of___________________?

   A. 6 kg/cm
   B. 12kg/cmz
   C. 20 kg/cmz
   D. 27.5 kg/cmz
   E. 35 kg/cm

10. A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?

    A. more efficient
    B. less efficient
    C. equally efficient
    D. unperdictable
    E. other factors will decide it