1. A pump delivers 50 L/s of water and consumes 10HP of power by the pump system. Determinehead developed by the pump.2. A pump receives 8 kgs of water at 220 kPa and 110°C and discharges it at 1100 kPa. Compute thepower required in kW.3. A water pump develops a total head of 200 ft. The pump efficiency if 80%and the motor efficiencyis 87.5 %. If the power rate is 1.5 cents per kw-hr, what is the power cost for pumping 1000 gal?4. A hydraulic turbine receives water from a reservoir at an elevation of 100 m above it. What is theminimum water flow in kg/s to produce a steady turbine output of 50 MW?5. A hydro-electric plant discharges water at the rate of 0.75 m³/s and enters the turbine at 0.35 mpswith a pressure of 275 kPa. Runner inside diameter is 550 mm, speed is 520 rpm, and the turbineefficiency is 98%. Find the turbine speed factor.6. A double overhung impulse turbine of 85% efficiency is direct connected to a 30,000 kWgenerator of 95% efficiency. Elevation of headwater level is 2730 ft. above sea level, elevation oftailwater level is 1260 ft. above sea level, turbine setting is 12 ft., velocity of flow in penstock is equalto 0.025/2gh, loss of head due to friction is 2% of gross head. Compute the flow through theturbine in ft³/s.7. A Pelton type turbine was installed 30 m below the head gate of the penstock. The head loss dueto friction is 15% of the given elevation. The length of the penstock is 80 m, and the coefficient offriction is 0.00093. Determine the power output in kW.

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1. A pump delivers 50 L/s of water and consumes 10HP of power by the pump system. Determine head developed by the pump.

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Fluid Kinematics

The branch of science that deals with objects which are either in motion or stationary are studied under the branch of classical mechanics. Fluid mechanics is a subcategory of classical mechanics that deals with the behavior of fluids at rest (fluid statics) or in motion (posing some velocity). In fluid kinematics, studies focus on the associated motion of fluid particles or groups of particles, and its associated parameters like displacements, velocity, and acceleration without concerning about the forces that caused the motion. All the laws of classical mechanics are applied in the study of fluid kinematics.

Question

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1. A pump delivers 50 L/s of water and consumes 10HP of power by the pump system. Determine
head developed by the pump.
2. A pump receives 8 kgs of water at 220 kPa and 110°C and discharges it at 1100 kPa. Compute the
power required in kW.
3. A water pump develops a total head of 200 ft. The pump efficiency if 80%and the motor efficiency
is 87.5 %. If the power rate is 1.5 cents per kw-hr, what is the power cost for pumping 1000 gal?
4. A hydraulic turbine receives water from a reservoir at an elevation of 100 m above it. What is the
minimum water flow in kg/s to produce a steady turbine output of 50 MW?
5. A hydro-electric plant discharges water at the rate of 0.75 m³/s and enters the turbine at 0.35 mps
with a pressure of 275 kPa. Runner inside diameter is 550 mm, speed is 520 rpm, and the turbine
efficiency is 98%. Find the turbine speed factor.
6. A double overhung impulse turbine of 85% efficiency is direct connected to a 30,000 kW
generator of 95% efficiency. Elevation of headwater level is 2730 ft. above sea level, elevation of
tailwater level is 1260 ft. above sea level, turbine setting is 12 ft., velocity of flow in penstock is equal
to 0.025/2gh, loss of head due to friction is 2% of gross head. Compute the flow through the
turbine in ft³/s.
7. A Pelton type turbine was installed 30 m below the head gate of the penstock. The head loss due
to friction is 15% of the given elevation. The length of the penstock is 80 m, and the coefficient of
friction is 0.00093. Determine the power output in kW.

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