A wind turbine with a rotor diameter of 77 m produces 1.5 MW of electrical power at a wind speed of 
What
What will be an ideal response?
The kinetic energy per unit mass of the wind approaching the turbine is 
The volumetric flow rate of air approaching the turbine is given by the velocity times the cross-sectional area: 
If the density of the air is 
then the mass flow rate is:
If this has a kinetic energy of 
then the total power available is 
The efficiency of the turbine (electrical energy output divided by kinetic energy of the approaching air) is 1.5/5.03 = 0.30.
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An ideal gas, initially at 30°C and 100 kPa, undergoes the following cyclic processes in a closed system:
What will be an ideal response?
(a) In mechanically reversible processes, it is first compressed adiabatically to 500 kPa, then cooled at a constant pressure of 500 kPa to 30°C, and finally expanded isothermally to its original state.
(b) The cycle traverses exactly the same changes of state, but each step is irreversible with an efficiency of 80% compared with the corresponding mechanically reversible process. Note: The initial step can no longer be adiabatic.
Calculate Q, W, ?U, and ?H for each step of the process and for the cycle. Take 
and 
The reproductive potential of bobwhite quail is higher than the pronghorn antelope
a. True b. False Indicate whether the statement is true or false
Identify three types of sight issues that you may encounter when you are selecting a location for a solar energy system
What will be an ideal response?
A gear type coupling is used:
A. for extremely heavy loads. B. when the unit can't be moved. C. where alignment is not critical. D. none of the above.