Calculate the turbine’s thermal efficiency in a steam plant generating power which is produced by a boiler at a rate of 235,000 kg/h at an absolute pressure of 6,000 kPa and 500°C. The feedwater temperature entering the boiler is 155°C. The fuel consumption is 26, 000 kg/h. The calorific value of the fuel is 30,600 kJ/kg and the turbine develops 41 MW.
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Question 2 of 34
2. Question
Calculate the boiler efficiency in a steam plant generating power which is produced by a boiler at a rate of 235,000 kg/h at an absolute pressure of 6,000 kPa and 500°C. The feedwater temperature entering the boiler is 155°C. The fuel consumption is 26, 000 kg/h. The calorific value of the fuel is 30,600 kJ/kg and the turbine develops 41 MW.
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Question 3 of 34
3. Question
Determine the steam pressure exiting the boiler installed in a condensing steam plant with a rankine efficiency of 30%, steam leaves the boiler at 400°C. The condensers absolute pressure is 22.60 mm of mercury and the turbine exhaust is 11% wet.
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Question 4 of 34
4. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The blading efficiency.
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Question 5 of 34
5. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The power supplied.
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Question 6 of 34
6. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The axial thrust.
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Question 7 of 34
7. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The energy lost due to friction of the steam across the blades.
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Question 8 of 34
8. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The exit blade angle.
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Question 9 of 34
9. Question
Calculate the following on the basis of one kg of steam supplied per second in an impulse turbine with the theoretical enthalpy drop of the steam through the nozzles is 311.5 kJ/kg and 10% of this is lost in friction in the nozzles. The nozzle angle is 20°, the inlet angle of the blades is 35°, and the absolute velocity of the steam leaving the blades is 205 m/s in the direction of the axis of the turbine. The blade velocity to prevent steam entry shock.
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Question 10 of 34
10. Question
The steam velocity exiting the nozzles of an impulse turbine is 885 m/s and the nozzle angle is 22 degrees. The blade velocity is 310 m/s and the blade velocity coefficient is 0.80. Calculate the axial thrust taking the mass flow of 1 kg/s and symmetrical blading.
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Question 11 of 34
11. Question
The steam velocity exiting the nozzles of an impulse turbine is 885 m/s and the nozzle angle is 22 degrees. The blade velocity is 310 m/s and the blade velocity coefficient is 0.80. Calculate the diagram power taking the mass flow of 1 kg/s and symmetrical blading.
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Question 12 of 34
12. Question
The steam velocity exiting the nozzles of an impulse turbine is 885 m/s and the nozzle angle is 22 degrees. The blade velocity is 310 m/s and the blade velocity coefficient is 0.80. Calculate the driving force on the wheel taking the mass flow of 1 kg/s and symmetrical blading.
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Question 13 of 34
13. Question
The steam velocity exiting the nozzles of an impulse turbine is 885 m/s and the nozzle angle is 22 degrees. The blade velocity is 310 m/s and the blade velocity coefficient is 0.80. Calculate the blade inlet angle taking the mass flow of 1 kg/s and symmetrical blading.
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Question 14 of 34
14. Question
In a certain stage of a reaction turbine, the steam exits the guide blades and enters the moving blades at an absolute velocity of 245 m/s at a 25 degree angle to the plane of rotation and the blade velocity is 160 m/s. The moving and fixed blades have the same inlet and exit angles and the steam flow is 0.91 kg/s. Determine the stage power.
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Question 15 of 34
15. Question
In a certain stage of a reaction turbine, the steam exits the guide blades and enters the moving blades at an absolute velocity of 245 m/s at a 25 degree angle to the plane of rotation and the blade velocity is 160 m/s. The moving and fixed blades have the same inlet and exit angles and the steam flow is 0.91 kg/s. Determine the force on the blades.
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Question 16 of 34
16. Question
In a certain stage of a reaction turbine, the steam exits the guide blades and enters the moving blades at an absolute velocity of 245 m/s at a 25 degree angle to the plane of rotation and the blade velocity is 160 m/s. The moving and fixed blades have the same inlet and exit angles and the steam flow is 0.91 kg/s. Determine the inlet and exit angles of the blades.
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Question 17 of 34
17. Question
Steam exits the guide blades of a reaction turbine at 150 m/s. If the inlet angle of the moving blades is 40 degrees and the exit angles from the guide blades is 34 degrees determine the mean blade speed.
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Question 18 of 34
18. Question
Steam exits the nozzles of a single stage impulse turbine at 1100 m/s, the angle of the jet is 21 degrees to the direction of the movement of the blades. If the blade speed is 310 m/s determine the magnitude and direction of the absolute velocity of the steam at the exhaust.
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Question 19 of 34
19. Question
Steam exits the nozzles of a single stage impulse turbine at 1100 m/s, the angle of the jet is 21 degrees to the direction of the movement of the blades. If the blade speed is 310 m/s determine the inlet angle of the blades.
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Question 20 of 34
20. Question
Steam exits the nozzles of a single stage impulse turbine at 1100 m/s, the angle of the jet is 21 degrees to the direction of the movement of the blades. If the blade speed is 310 m/s determine velocity of whirl.
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Question 21 of 34
21. Question
The mean blade diameter on a single stage impulse turbine is 610 mm with a blade velocity of 110 m/s. Determine the axial component of the steam at the blades inlet if the nozzle angle is 19 degrees and the enthalpy drop across the nozzles is 470 kJ/kg.
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Question 22 of 34
22. Question
The mean blade diameter on a single stage impulse turbine is 610 mm with a blade velocity of 110 m/s. Determine the rotational speed of the turbine if the nozzle angle is 19 degrees and the enthalpy drop across the nozzles is 470 kJ/kg.
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Question 23 of 34
23. Question
The mean blade diameter on a single stage impulse turbine is 610 mm with a blade velocity of 110 m/s. Determine the blade inlet angle if the nozzle angle is 19 degrees and the enthalpy drop across the nozzles is 470 kJ/kg.
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Question 24 of 34
24. Question
Steam exits the nozzles at 480 m/s. The steam approaches at an angle of 19 degrees to the direction of blade movement and has an entrance angle of 34 degrees relative to the blades. The mean diameter of the rotor block assembly is 740 mm. Determine the turbines RPM.
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Question 25 of 34
25. Question
Steam exits the nozzles at 480 m/s. The steam approaches at an angle of 19 degrees to the direction of blade movement and has an entrance angle of 34 degrees relative to the blades. The mean diameter of the rotor block assembly is 740 mm. Determine the linear blade velocity.
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Question 26 of 34
26. Question
500 kPa steam enters a convergent-divergent nozzle. There is a 170 kJ/kg heat drop between the entrance and the throat where the pressure drops to 225 kPa. Determine the nozzle throat area required for a steam flow of 13 kg per minute
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Question 27 of 34
27. Question
13 kg/s steam at 500 kPa 250°C is expanded in a group of nozzles to 100 kPa. If the isentropic efficiency of the turbine is 0.91 determine the exit area of the nozzles.
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Question 28 of 34
28. Question
13 kg/s steam at 500 kPa 250°C is expanded in a group of nozzles to 100 kPa. If the isentropic efficiency of the turbine is 0.91 determine the steam velocity.
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Question 29 of 34
29. Question
Steam enters the nozzle of a turbine at 1000 kPa and 300°C. Steam exits the nozzle at 750 kPa and 0.98 dry. If the area of the nozzle outlet is 330 mm2, determine the mass of steam traveling through the nozzle per minute.
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Question 30 of 34
30. Question
Steam enters the nozzle of a turbine at 1000 kPa and 300°C. Steam exits the nozzle at 750 kPa and 0.98 dry. Determine the velocity of the steam at the nozzle outlet.
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Question 31 of 34
31. Question
2000 kPa steam at 400°C enters a steam turbine nozzle and exits at 1500 kPa 96% dry. Determine the mass of steam discharged per minute if the exit area is 325 mm2.
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Question 32 of 34
32. Question
2000 kPa steam at 400°C enters a steam turbine nozzle and exits at 1500 kPa 96% dry. Determine the steam exit velocity.
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Question 33 of 34
33. Question
1450 kPa steam at 300°C enters the nozzle of a turbine and leaves at 1300 kPa dry and saturated. Determine the weight of steam discharged per minute if the exit area is 4.25 cm2
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Question 34 of 34
34. Question
1450 kPa steam at 300°C enters the nozzle of a turbine and leaves at 1300 kPa dry and saturated. Determine the velocity of the steam at the nozzle exit.
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