Maximum work is done in compressing air when the compression is_________________? - PakMcqs

Related Mcqs:

1. The- most efficient method of compressing air is to compress it_________________?

   A. isothermally B. adiabatically C. isentropically D. isochronically E. as per law pV...

2. The work done per unit mass of air in compression will’be least when n is equal to______________?

   A. 1 B. 1.2 , C. 1.3 D. 1.4 E. 1.5...

3. 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...

4. 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...

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 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...

8. Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?

   A. higher B. lower C. equal D. can’t be compared E. unpredictable...

9. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

   A. lean mixture B. chemically correct mixture C. rich mixture D. unpredictable E. none of the above...

10. The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?

    A. 1 : 1.2 B. 1 : 2 C. 1 : 5 D. 1 : 10 E. 1 : 1...