The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?

Related Mcqs:

1. The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?

   A. increase first at fast rate and then slow
   B. increase first at slow rate and then fast
   C. decrease continuously
   D. first increase, reach maximum and then decrease
   E. none of the above

2. The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called__________________?

   A. pressure ratio
   B. pressure coefficient
   C. degree of reaction
   D. slip factor
   E. stage factor

3. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

   A. remain same
   B. decrease
   C. increase
   D. unpredictable
   E. none of the above

4. 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

5. The vloumetric efficiency of compressor with increase in compression ratio will ___________________?

   A. increase
   B. decrease
   C. remain same
   D. may increase/decrease depending on clearance volume
   E. none of the above

6. An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?

   A. one adiabatic, two isobaric, and one constant volume
   B. two adiabatic and two isobaric
   C. two adiabatic, one isobaric and one constant volume
   D. one adiabatic, one isobaric and two constant volume
   E. two isobaric, two adiabatic and one constant volume

7. An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?

   A. one adiabatic, two isobaric, and one constant volume
   B. two adiabatic and two isobaric
   C. two adiabatic, one isobaric and one constant volume,
   D. one adiabatic, one isobaric and two constant volume
   E. two isobaric, two adiabatic and one constant volume

8. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

   A. less
   B. more
   C. same
   D. more/less depending on compressor capacity
   E. unpredictable

9. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

   A. 0.1%
   B. 0.5%
   C. 1.0%
   D. 5%
   E. 10%.

10. The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

    A. 0.1%
    B. 0.5%
    C. 1%
    D. 5%
    E. 10%.