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The runner of an inward flow reaction turbine is of 45 cm diameter and 5 cm width at the outer periphery; the corresponding dimensions at the inner periphery are 30 cm and 7.5 cm respectively, and vanes occupy 8% of the periphery. The guide vane angle is 25° to the tangent to the runner and the moving vanes have an inlet angle of 95° (vanes inclined forward to the direction of motion) and an exit angle of 30°. Hydraulic and mechanical friction losses respectively amount to 10% and 5% of the supply head, and the pressure in the outer casing is 55 cm more than that at discharge from the runner. You are required to work out the speed of the runner for no shocks at entry and the power available at the turbine shaft.
Refer to Fig. for nomenclature and the vector diagrams.
  • a)
    614 rpm and 86 kW
  • b)
    656 rpm and 90 kW
  • c)
    613 rpm and 90 kW
  • d)
    500 rpm and 86 kw
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The runner of an inward flow reaction turbine is of 45 cm diameter an...
From continuity considerations, (area at inlet) × Vf1 = (area at outlet) × Vf2
From energy balance, Head supplied= work done or head utilized + energy at outlet (The head loss in the runner is being neglected)
Power developed by the turbine,
= 9810 × 0.42 × 0.524 × (6.48)2
= 90657 W
Since the mechanical losses amount to 5% Brake power = 90657 × 0.95 = 86124 W ≈ 86 kW
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Most Upvoted Answer
The runner of an inward flow reaction turbine is of 45 cm diameter an...
From continuity considerations, (area at inlet) × Vf1 = (area at outlet) × Vf2
From energy balance, Head supplied= work done or head utilized + energy at outlet (The head loss in the runner is being neglected)
Power developed by the turbine,
= 9810 × 0.42 × 0.524 × (6.48)2
= 90657 W
Since the mechanical losses amount to 5% Brake power = 90657 × 0.95 = 86124 W ≈ 86 kW
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Community Answer
The runner of an inward flow reaction turbine is of 45 cm diameter an...
From continuity considerations, (area at inlet) × Vf1 = (area at outlet) × Vf2
From energy balance, Head supplied= work done or head utilized + energy at outlet (The head loss in the runner is being neglected)
Power developed by the turbine,
= 9810 × 0.42 × 0.524 × (6.48)2
= 90657 W
Since the mechanical losses amount to 5% Brake power = 90657 × 0.95 = 86124 W ≈ 86 kW
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The runner of an inward flow reaction turbine is of 45 cm diameter and 5 cm width at the outer periphery; the corresponding dimensions at the inner periphery are 30 cm and 7.5 cm respectively, and vanes occupy 8% of the periphery. The guide vane angle is 25° to the tangent to the runner and the moving vanes have an inlet angle of 95° (vanes inclined forward to the direction of motion) and an exit angle of 30°. Hydraulic and mechanical friction losses respectively amount to 10% and 5% of the supply head, and the pressure in the outer casing is 55 cm more than that at discharge from the runner. You are required to work out the speed of the runner for no shocks at entry and the power available at the turbine shaft.Refer to Fig. for nomenclature and the vector diagrams.a) 614 rpm and 86 kWb) 656 rpm and 90 kWc) 613 rpm and 90 kWd) 500 rpm and 86 kwCorrect answer is option 'A'. Can you explain this answer?
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The runner of an inward flow reaction turbine is of 45 cm diameter and 5 cm width at the outer periphery; the corresponding dimensions at the inner periphery are 30 cm and 7.5 cm respectively, and vanes occupy 8% of the periphery. The guide vane angle is 25° to the tangent to the runner and the moving vanes have an inlet angle of 95° (vanes inclined forward to the direction of motion) and an exit angle of 30°. Hydraulic and mechanical friction losses respectively amount to 10% and 5% of the supply head, and the pressure in the outer casing is 55 cm more than that at discharge from the runner. You are required to work out the speed of the runner for no shocks at entry and the power available at the turbine shaft.Refer to Fig. for nomenclature and the vector diagrams.a) 614 rpm and 86 kWb) 656 rpm and 90 kWc) 613 rpm and 90 kWd) 500 rpm and 86 kwCorrect answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The runner of an inward flow reaction turbine is of 45 cm diameter and 5 cm width at the outer periphery; the corresponding dimensions at the inner periphery are 30 cm and 7.5 cm respectively, and vanes occupy 8% of the periphery. The guide vane angle is 25° to the tangent to the runner and the moving vanes have an inlet angle of 95° (vanes inclined forward to the direction of motion) and an exit angle of 30°. Hydraulic and mechanical friction losses respectively amount to 10% and 5% of the supply head, and the pressure in the outer casing is 55 cm more than that at discharge from the runner. You are required to work out the speed of the runner for no shocks at entry and the power available at the turbine shaft.Refer to Fig. for nomenclature and the vector diagrams.a) 614 rpm and 86 kWb) 656 rpm and 90 kWc) 613 rpm and 90 kWd) 500 rpm and 86 kwCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The runner of an inward flow reaction turbine is of 45 cm diameter and 5 cm width at the outer periphery; the corresponding dimensions at the inner periphery are 30 cm and 7.5 cm respectively, and vanes occupy 8% of the periphery. The guide vane angle is 25° to the tangent to the runner and the moving vanes have an inlet angle of 95° (vanes inclined forward to the direction of motion) and an exit angle of 30°. Hydraulic and mechanical friction losses respectively amount to 10% and 5% of the supply head, and the pressure in the outer casing is 55 cm more than that at discharge from the runner. You are required to work out the speed of the runner for no shocks at entry and the power available at the turbine shaft.Refer to Fig. for nomenclature and the vector diagrams.a) 614 rpm and 86 kWb) 656 rpm and 90 kWc) 613 rpm and 90 kWd) 500 rpm and 86 kwCorrect answer is option 'A'. Can you explain this answer?.
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