The pressure on the two sides of the impulse wheel of a steam turbine_____?

Related Mcqs:

1. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?

   A. 0.6
   B. 0.578
   C. 0.555
   D. 0.5457

2. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?

   A. 0.555
   B. 0.578
   C. 0.5457
   D. 0.6

3. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?

   A. 20 kgf/cm2
   B. 50 kgf/cm2
   C. 100 kgf/cm2
   D. 150 kgf/cm2

4. In case of impulse steam turbine_____________?

   A. there is enthalpy drop in fixed and moving blades
   B. there is enthalpy drop only in moving blades
   C. there is enthalpy drop in nozzles
   D. none of the above

5. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?

   A. pvls=C
   B. pv1126 = C
   C. pv1A = C
   D. pv = C

6. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?

   A. pv = C
   B. pv1A = C
   C. pv1i = C
   D. pv

7. Steam turbines commonly used in steam power station are__________?

   A. condensing type
   B. non-condensing type
   C. none of the above

8. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

   A. increase in exit velocity from the nozzle
   B. decrease in exit velocity from the nozzle
   C. no change in exit velocity from the nozzle
   D. increase or decrease depending upon the exit quality of steam

9. The effect of considering friction in steam nozzles for the same pressure ratio leads to_________?

   A. increase in dryness fraction of exit steam
   B. decrease in dryness fraction of exit steam
   C. no change in the quality of exit steam
   D. decrease or increase of dryness fraction of exit steam depending upon inlet quality

10. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?

    A. higher
    B. lower
    C. same as long as initial pressure and temperature is unchanged
    D. none of the above