The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________?

Related Mcqs:

1. 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

2. 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.

3. 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

4. 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

5. 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

6. 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

7. Which of the following medium is compressed in a Diesel engine cylinder __________________?

   A. air aione
   B. air and fuel
   C. air and lub oil
   D. fuel alone
   E. air, fuel and lub oil

8. Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________?

   A. upto 25%
   B. upto 35%
   C. upto 50%
   D. upto 75%
   E. upto 100%.

9. A 4-stroke diesel engine needs about following amount of air_________________?

   A. 75 cc per min. per h.p.
   B. 750 cc per min. per h.p.
   C. 7500 cc per min. per h.p.
   D. 75000 cc per min. per h.p.
   E. 750000 cc per min. per h.p

10. The thermal efficiency of a diesel engine is of the order of_________________?

    A. 92%
    B. 68%
    C. 52%
    D. 34%
    E. 25%.