PROBLEM SOLVING FOR WIND POWER AND MICRO-HYDRO POWER SYSTEM
Wednesday, July 31, 2024
PROBLEM-SOLVING FOR WIND POWER AND MICRO-HYDRO POWER SYSTEM
A. 22.3 kW B. 25.96 kW C. 29.67 kW D. 33.38 kW
A. 1,077 W B. 577W C.
415 W D. 215 W
Calculate the hydraulic power output of a 16-bladed windmill if the wind velocity is 4 m/s. System efficiency and
rotor power coefficient are 80% and 0.3 respectively. The rotor diameter is 6 meters.
Air density is 1.2 kg/m3.
A. 217 W B. 723 W C. 317 W D.
327 W
What should be the starting
torque of an 8-meter rotor diameter wind pumping system when its running torque is
950 Newton meters.
A. 1,983 N-m B. 2983N-m C. 3983 Nm D. 1398 N-m
It
is a structure that facilitates the entry of water into the conduit system.
A. Weir B.
Intake C. Headrace D. None of the above
Answer:
B
Conveys
water from the intake to the forebay or surge tank.
A. Headrace B.
Tailrace C. Penstock D. Weir
Answer: A
A
hydraulic motor that converts the energy of water to mechanical energy.
A. Generator B. Turbine C. Dumper D.
Engine
Answer: B
The volume of container used to
measure: 50 liters
Time to fill: Trial 1 - 2 sec Trial 6 - 2 sec
Trial 2 - 2
sec Trial 7 - 2.5 sec
Trial 3 - 1.5
sec Trial 8 - 2.5 sec
Trial 4 - 1.5
sec Trial 9 – 2 sec
Trial 5 - 1.5
sec Trial 10 – 2.5 sec
What is the theoretical power that can
be generated from the fall? What is the power generated by a micro-hydropower
plant if the system efficiency is 70%? What is the power generated if the system efficiency is 70%?
A. 14.9 kW, 10.4 kW B. 24.9 kW, 17.4 kW C.
39 kW, 27.3 kW D. 49 kW,34.3kW
A barangay official from a hinterland
barangay of Agusan del Sur approached you to conduct a site assessment for a
possible micro-hydro power system in their area. The power requirement of their
barangay is 25 kW. During your
assessment, the following data were obtained. The water source is a stream with
a rocky bed and a width of 4 meters. The following depths from an X-section
were measured 0.6 m, 1.0 m, 1.3 m, 1.2 m, and 0.75 m. Using a float method to
obtain the stream velocity, for a distance of 50 meters the following times in
5 trials were recorded: 10 min, 9 min, 9 min, 11 min, 11 min. The gross head from the forebay site to the powerhouse
site is 30 meters. From the data
obtained, how many kilowatts of power is in excess? Assume a typical
efficiency.
A. 6 kW B. 9 kW C. 13kW D.
16 kW
Structure
built across the river which is used to divert the flow, and raise or maintain the
water level.
A. Headrace B. Tailrace C. Forebay
D. Weir
Answer: D
Structure designed to collect and flush sediments and other
water-suspended materials to avoid entry to the penstock and eventually to the
turbine.
A. Headrace B.
Settling Basin C. Sludge Basin D. Trash Rack
Answer: B
Structure that facilitates the entry of water to the penstock.
This serves as a temporary reservoir during the start
of the operation.
A. Forebay B.
Tailrace C. Headrace D. Weir
Answer: A
An electrical machine that converts mechanical energy to electrical
energy
A. Engine B. Generator C. Hydropower D.
None of the above
Answer: B
What is the
actual power that can be generated from
a 3.0-meter radius windpump if the average wind velocity of the place is 10
kph? The power coefficient is 0.4 and the system
efficiency is 72%. Air density is 1.2 kg/m3.
A. 205 W B. 155 W C. 105 W D. 75 W
In a pumping system, what is the approximate energy
requirement in kilowatt-hours if the daily water demand is 50 cubic
meters and the pumping head is 20 meters?
A. 1.750 kWh B. 2.725 kWh C. 3.752 kWh D.
4.527 kWh
Using the weir method in assessing the flow rate of a
stream, the following data were obtained:
Weir shape – triangular, depth of flow above the notch is 30 cm. What is the power potential of that water
resource if there is an available drop of 60 meters?
A. 20.0 kW B. 30.0 kW C. 40.0 kW D. 50.0kW
The Betz coefficient is __.
A. 18/28 B. 18/27 C. 16/28 D. 16/27
Answer: D
If you double the diameter of the rotor, the power will increase how many times?
A. 2 times
B. 4 times C. 6 times D. 8 times
Answer: B
If the wind velocity is doubled, the power will increase how many times?
A. 2 times
B. 4 times C. 6 times D. 8 times
Answer: D
The ratio of the actual power converted by the
rotor to that of the wind.
A. Power
coefficient B. Efficiency C. Power output D. None
of the above
Answer: A
What is the
tip-speed ratio of a 6-meter diameter rotor aerogenerator if the blade tip-speed is 30
m/s in a 4 m/s wind velocity?
A. 1.5 B. 7.5 C. 0.133 D. 5
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