Which of the following statements is/are true for Impulse turbines? i. They are a specific type of hydraulic turbine that harnesses the kinetic energy of high velocity water sprays or steam to generate electrical power. ii. Water strikes the blades normally within the impulse turbines, leading to its alternate name, the normal turbine.
- AOnly (i)Correct
- BOnly (ii)
- CBoth (i) and (ii)
- DNeither (i) nor (ii)
Solution
Concept
Working principles of impulse turbines
Formula
NONE
Step-by-step solution
1. Impulse turbines convert the kinetic energy of high-velocity water jets into mechanical energy, but statement ii incorrectly describes their operation and naming. Answer: A
Explanation
Impulse turbines utilize high-velocity jets of water or steam to strike runner blades and harness kinetic energy for electrical power generation. Water strikes tangentially rather than normally, so statement ii is incorrect. Therefore, option A is correct.
Why the other options are wrong
B) Statement (ii) is incorrect because impulse turbines are not called normal turbines. C) Both statements (i) and (ii) present incorrect descriptions of hydraulic impulse turbines.
Shortcut
Impulse turbines involve tangential flow (e.g., Pelton wheel), not normal flow (only statement i is true).
Common mistake
Selecting option C by believing impulse turbines are also referred to as normal turbines based on jet striking direction.
Correct answer: A) Only (i)