10. An impulse turbine discharges water at the rate of 0.75 m³/s and enters the turbine at 0.35m/s with a pressure of 275 kPa. If the turbine efficiency is 88 % , determine the brake power develop by the turbine.
a. 154.34 Kw
c. 181.54 Kw
b. 166.72 Kw
d. 217.33 Kw
12. A reaction turbine develops 500 BHP, flow through the turbine is 50 ft³ / sec. Water enters at 20 ft/sec with 100 ft. pressure head. Elevation of the water at turbine inlet above the tail water is 10 ft. what is the turbine efficiency?
a. 75.8 %
c. 85.1 %
b. 81.2 %
d. 88.1 %
13. A hydraulic turbine receives water from a reservoir at an elevation of 350 ft. above it. What is the minimum water flow in kg per second to produce a steady turbine output of 55 MW
a. 39 861
c. 52 544
b. 47 602
d. 68 083
14. An existing hydroelectric power plant has the following data;
Gross head................... 25m
Flow rate..................... 2.5 m³/s
Length of penstock....... 25 m
Penstock diameter........ 1.2 m
Coefficient of friction..... 0.023
Find the effective head used by the turbine.
a. 11.2 m
c. 14.3 m
b. 13.1 m
d. 15.7 m
15. A river 65 m wide and 2.5 m deep flows at 2 m/s. A hydro plant develops a pressure of 2250 mm Hg just before the turbine, what maximum power in MW is possible:
a. 78.4
c. 88.2
b. 82.6
d. 97.5