A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. Can you explain this answer?

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The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:

(i) the specific speed

(ii) the degree of reaction

Assume values for the hydraulic and overall efficiencies are 94% and 92% respectively.

a)
83.25 and 83.25 %
b)
48.71 and 83.25%
c)
83.25 and 48%
d)
48.71 and 47.8%

Correct answer is option 'C'. Can you explain this answer?

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A water turbine is stated to have 50 percent degree of reaction. What...

The statement that a water turbine has a 50 percent degree of reaction implies that the pressure drops in the rotor and guide blades are equal. The value of degree of reaction characterizes the design of a turbomachine. In a pure impulse turbine, there is no change of static pressure and degree of reaction R = 0. For a Francis runner: 0 < r="" />< 1.="" for="" a="" kaplan="" runner:="" 0.5="" />< r="" />< 1.="" the="" specific="" speed="" of="" a="" turbine="" increases="" with="" an="" increase="" in="" its="" degree="" of="" />

Assuming axial discharge, hydraulic efficiency,

∴ Rotor vane angle at inlet, β₁ = tan⁻¹ 4.58 = 77.68° Degree of reaction,

= 0.48 or 48%

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A water turbine is stated to have 50 percent degree of reaction. What...

Assuming axial discharge, hydraulic efficiency,

∴ Rotor vane angle at inlet, β₁ = tan⁻¹ 4.58 = 77.68° Degree of reaction,

= 0.48 or 48%

Answered by Engineers Club · View profile

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A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. Can you explain this answer?

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A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. 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 A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. 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 A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. Can you explain this answer?.

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If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A water turbine is stated to have 50 percent degree of reaction. What is the physical meaning of this statement? Classify the Pelton, Francis and Kaplan runners according to the ranges of degree of reaction. Does the specific speed increase or decrease with an increase in the degree of reaction of a hydraulic turbine?The velocity and pressure head at the entrance to the volute casing of a Francis turbine are 10 m/s and 240 m, and the elevation above tail race is 5 m. The shaft is vertical and the machine discharges 15 m3⁄s when turning 450 revolutions per minute. The mean diameter for the runner blades is 2 m and the width at inlet is 28 cm. If the discharge is to be axial, calculate:(i) the specific speed(ii) the degree of reactionAssume values for the hydraulic and overall efficiencies are 94% and 92% respectively.a) 83.25 and 83.25 %b) 48.71 and 83.25%c) 83.25 and 48%d) 48.71 and 47.8%Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.

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