Distinguish between a fluid coupling and a torque converter. With neat sketch describe the working of a torque converter.
A Pelton wheel develops 6500 kW6500 \text{ kW}6500 kW at 200 rpm200 \text{ rpm}200 rpm under a head of 220 m220 \text{ m}220 m with an overall efficiency of 85%85%85%. Determine the unit speed, unit discharge and unit power, and the speed, discharge and power when the turbine is working under a head of 140 m140 \text{ m}140 m.
What is the physical significance of unit quantities on the performance of the hydraulic turbine? Derive the expressions of "unit speed" and "unit power" from the concept of unit turbine.
In a hydroelectric station, water is available at the rate of 175 m3/s175 \text{ m}^3/\text{s}175 m3/s under a head of 18 m. If the available turbines run at a speed of 150 rpm with overall efficiency of 82%, determine the number of turbine required, in case of Francis turbine with maximum specific speed of 460 rpm Kaplan turbine with maximum specific speed of 350 rpm.
Explain the significance of specific speed of water turbine.
What factors decide whether a Kaplan, Francis or a Pelton type turbine would be used in a hydroelectric project?
A Francis turbine works under a head of 25 m25\text{ m}25 m and produces 11800 kW11800\text{ kW}11800 kW while running at 120 rpm120\text{ rpm}120 rpm. The turbine has been installed at a station where atmospheric pressure is 10 m10\text{ m}10 m of water and vapor pressure is 0.2 m0.2\text{ m}0.2 m of water. Determine (i) specific speed of the turbine, and (ii) the maximum permissible height of the draft tube.
How the speed of a reaction turbine governed by servo motor, discuss with neat sketch.
Write short notes (any four) on the following:
What is governing of turbine? Explain with neat sketch, the governing of impulse turbine.
A turbine is operating under a head of 25 m25\text{ m}25 m at 200 rpm200\text{ rpm}200 rpm. The discharge is 9 m3/s9\text{ m}^3\text{/s}9 m3/s. If the efficiency is 90%90%90%, determine:
Power generated
Specific speed of the turbine, and
Type of turbine.
How the speed of a reaction turbine governed by servomotor, discuss with neat sketch.
A Kaplan turbine operating under a net head of 20 m20 \text{ m}20 m develops 100 kW100 \text{ kW}100 kW power with an overall efficiency of 85%85%85%. The speed ratio is 222 and flow ratio is 0.60.60.6. The hub diameter of the wheel is 0.350.350.35 times the outside diameter of the wheel. Determine (i) the diameter and (ii) speed of the turbine.