Consider the energy content of the different fossil fuels and their EROI. Discuss why it will be difficult to shift the global energy system away from these resources.
What will be an ideal response?
Very simply, the high energy content of fossil fuels, as well as the infrastructure that has evolved over time to process and extract them, creates a very high energy returned on energy invested. We get much more energy from our time and effort from fossil fuels than from renewables.
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What does the following drawing show?
a. A through hole with a counterbore
b. A blind hole with a spotface
c. A through hole with a countersink
Which of the following are considered to be man-made features?
a. Streams b. Trees c. Reservoir dams d. Rivers
In order to determine superheat what information is NOT required?
A. The evaporator inlet temperature. B. The evaporator outlet temperature. C. The suction pressure. D. The saturation temperature as determined from the refrigerant pressure temperature charts.
The circuit of Figure 12.40 is used to provide regenerative braking in a traction motor. The motor constant is 0.25 V/rpm, and the supply voltage is 550V. The armature resistance is Ra = 0.15 ?. The motor speed is 1,000 rpm, and the motor current is 200 A.
a. Determine the duty cycle ? of the converter.
b. Determine the average power fed back to the battery.
