The rating of a diesel engine, with increase in airintlet temperature, will ___________________? - PakMcqs

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

   A. feeding more fuel B. increasing flywheel size C. heating incoming air D. scavenging E. supercharging...

6. 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...

7. 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...

8. In a typical medium speed, 4-stroke cycle diesel engine ___________________?

   A. fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center B. fuel injection starts at top dead center and ends at 20° after top dead center C. fuel injection starts at just before top dead center and ends just after top deac center D. may start and end...

9. 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%....

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

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