Correct Answer : Option (B) : x- component of V(r2) – blade velocity
Explanation : By constructing velocity triangle we come to know that whirl velocity of jet is equal in magnitude to that of x- component of V r2 – blade velocity.
Correct Answer : 90.91
Explanation : The definition of Hydraulic efficiency in a Kaplan turbine states that it is the ratio between the Runner power to the shaft power. If input water power is 1.10 times the runner power, the runner power is 1/1.10 = 0.90909 Times the water power. Hence, hydraulic efficiency = 90.91%.
Correct Answer : Hydraulic efficiency
Explanation : The definition of Hydraulic efficiency in a Kaplan turbine states that it is the ratio between the Runner power to the shaft power. Hence, the correct option is Hydraulic efficiency.
Correct Answer : Kaplan turbine
Explanation : As the head for Kaplan turbine is low, the discharge of water through the turbine is high and hence, blade resistance should be low. That’s why Kaplan turbine will have the lowest number of blades.
