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Consider the following statements with regard to hydraulic turbines:
1. Kaplan turbines are most efficient at part load operations.
2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.
3. The flow ratio of Francis turbines are in the range of 0.1-0.3.
Which of the above statements is/are correct?
- a)1, 2 and 3
- b)1 and 2 only
- c)1 and 3 only
- d)2 and 3 only
Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements with regard to hydraulic turbines:1...
Kaplan turbines are the most efficient turbines under part load conditions. If n is the number of jets in the Pelton turbine, then Q α n and hence power α n. since specific speed is α √ power. So, specific speed α √n. Therefore statement (II) is wrong. The flow ratio is defined as the ratio of velocity of flow at inlet to theoretical jet velocity and it is in the ratio of 0.1-0.3 for the Francis turbine.
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Consider the following statements with regard to hydraulic turbines:1...
Statement 1: Kaplan turbines are most efficient at part load operations.
- Explanation: Kaplan turbines are a type of axial flow turbine that are commonly used for low head and high flow rate conditions. They have adjustable blades that allow them to operate efficiently over a wide range of flow rates and heads.
- At part load operations, where the flow rate is lower than the rated flow rate, the Kaplan turbine is able to adjust its blades to provide optimal efficiency. Therefore, statement 1 is correct.
Statement 2: If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n^2.
- Explanation: The specific speed of a turbine is a dimensionless parameter that represents the speed at which the turbine operates for a given head and flow rate. It is defined as the speed at which a geometrically similar turbine would operate under unit head and unit flow rate conditions.
- For a Pelton turbine, the number of jets (n) is a design parameter that affects the specific speed. However, the specific speed is not directly proportional to n^2. The relationship between the specific speed and the number of jets in a Pelton turbine is more complex and depends on other factors such as the bucket shape, jet diameter, and jet spacing. Therefore, statement 2 is incorrect.
Statement 3: The flow ratio of Francis turbines are in the range of 0.1-0.3.
- Explanation: The flow ratio of a turbine is defined as the ratio of the actual flow rate to the design flow rate. For Francis turbines, which are a type of mixed flow turbine, the flow ratio is typically in the range of 0.1-0.3. This means that the actual flow rate is 10-30% of the design flow rate. The flow ratio affects the efficiency and performance of the turbine, with lower flow ratios generally resulting in higher efficiencies. Therefore, statement 3 is correct.
In conclusion, the correct statements are 1 and 3, so the answer is option C) 1 and 3 only.
- Explanation: Kaplan turbines are a type of axial flow turbine that are commonly used for low head and high flow rate conditions. They have adjustable blades that allow them to operate efficiently over a wide range of flow rates and heads.
- At part load operations, where the flow rate is lower than the rated flow rate, the Kaplan turbine is able to adjust its blades to provide optimal efficiency. Therefore, statement 1 is correct.
Statement 2: If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n^2.
- Explanation: The specific speed of a turbine is a dimensionless parameter that represents the speed at which the turbine operates for a given head and flow rate. It is defined as the speed at which a geometrically similar turbine would operate under unit head and unit flow rate conditions.
- For a Pelton turbine, the number of jets (n) is a design parameter that affects the specific speed. However, the specific speed is not directly proportional to n^2. The relationship between the specific speed and the number of jets in a Pelton turbine is more complex and depends on other factors such as the bucket shape, jet diameter, and jet spacing. Therefore, statement 2 is incorrect.
Statement 3: The flow ratio of Francis turbines are in the range of 0.1-0.3.
- Explanation: The flow ratio of a turbine is defined as the ratio of the actual flow rate to the design flow rate. For Francis turbines, which are a type of mixed flow turbine, the flow ratio is typically in the range of 0.1-0.3. This means that the actual flow rate is 10-30% of the design flow rate. The flow ratio affects the efficiency and performance of the turbine, with lower flow ratios generally resulting in higher efficiencies. Therefore, statement 3 is correct.
In conclusion, the correct statements are 1 and 3, so the answer is option C) 1 and 3 only.
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Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'C'. Can you explain this answer?
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Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect 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 Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect 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 Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'C'. Can you explain this answer?.
Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect 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 Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect 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 Consider the following statements with regard to hydraulic turbines:1. Kaplan turbines are most efficient at part load operations.2. If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.3. The flow ratio of Francis turbines are in the range of 0.1-0.3.Which of the above statements is/are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'C'. Can you explain this answer?.
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