Ram compression in turbojet involves____________________? - PakMcqs

Related Mcqs:

1. Turbo propeller has the following additional feature over the turbojet __________________?

   A. peopeller B. diffuser C. intercooler D. turbine and combustion chamber E. starting engine...

2. The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?

   A. less B. more C. same D. may be less or more depending on ambient conditons E. unpredictable...

3. Which of the following fuels can be used in turbojet engines _____________________?

   A. liquid hydrogne B. high speed diesel oil C. kerosene D. demethylated spirit E. methyl alcohol...

4. The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?

   A. 550 km/hr B. 1050km/hr C. 1700 km/hr D. 2400km /hr E. 4000 km/hr...

5. Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?

   Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke...

6. The advantage of multistage compression over single stage compression is ________________?

   A. lower power consumption per unit of air delivered B. higher volumetric efficiency C. decreased discharge temperature D. moisture free air E. all of the above...

7. For minimum work in multistage compression, assuming same index of compression in all stages_________________?

   A. work done in first stage should be more B. work done in subsequent stages should increase C. work done in subsequent stages should decrease D. work done in all stages should be equal E. work done in any stage is no criterion for minimum work but depends on other factors...

8. For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?

   A. increase B. decrease C. remain unaffected D. other factors control it E. unpredictable...

9. Ram-jet engine__________________?

   A. is self-operating at zero flight speed B. is not self-operating at zero^flight speed C. requires no air for its operation D. produces a jet consisting of plasma E. none of the above...

10. For a compressor, least work will be done if the compression is________________ ?

    A. isentropic B. isothermal C. polytropic D. somewhere in between isentropic and isothermal E. none of the above...