In a naturally aspirated diesel engine, the air is supplied by________________? - 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. Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?

   A. Supercharged B. Not supercharged C. Charged D. Supercharged provided its speed is low...

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. 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...

5. 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....

6. 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...

7. 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...

8. 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...

9. 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...

10. Scavenging air in diesel engine means___________________?

    A. air used for combustion sent under pres-sure B. forced air for cooling cylinder C. burnt air containing products of combustion D. air used for forcing burnt gases out of engine’s cylinder during the exhaust period E. air fuel mixture...