# ET372 Final

- A golfer estimates that his golfball is 250 yards to the hole. At the hole, another golfer has dropped a water bottle that is reflecting light back to the golfer and his ball. What is the approximate time difference based on golfers distance to the hole/water bottle?
- A CdS photocell has a resistance versus light intensity as shown in the following graph. The cell has a time constant of 25 ms. At
*t=0*, the cell is exposed to a sudden change of light intensity 20 W/m^{2}to 80 W/m^{2}. What is the sensor resistance after 20 ms? Figure 1: CdS Resistance Versus Light Intensity - A force of 120 pounds-force is used to open a valve. What is the are of the diaphragm is a control gauge of 90 kPa (~ 13 psi) must provide this force?
- A processing plant is being proposed and will need to use of the city’s water system to be sucessful. The plant will need a minimum of 2500 gallons of water per minute (gpm) for its operation. The city’s current water supply pipe to the proposed plant is 12 inches in diameter with a water velocity of 1.5 m/s. Will the city’s current water supply meet the plant’s needs or will it need to be upgraded? Show calculations to verify your answer.
- From the figure below, construct the truth table for the logic diagram. What function does this represent?

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- A golfer estimates that his golfball is 250 yards to the hole. At the hole, another golfer has dropped a water bottle that is reflecting light back to the golfer and his ball. What is the approximate time difference based on golfers distance to the hole/water bottle?
- A CdS photocell has a resistance versus light intensity as shown in the following graph. The cell has a time constant of 25 ms. At
*t=0*, the cell is exposed to a sudden change of light intensity 20 W/m^{2}to 80 W/m^{2}. What is the sensor resistance after 20 ms?

Figure 1: CdS Resistance Versus Light Intensity

- A force of 120 pounds-force is used to open a valve. What is the are of the diaphragm is a control gauge of 90 kPa (~ 13 psi) must provide this force?
- A processing plant is being proposed and will need to use of the city’s water system to be sucessful. The plant will need a minimum of 2500 gallons of water per minute (gpm) for its operation. The city’s current water supply pipe to the proposed plant is 12 inches in diameter with a water velocity of 1.5 m/s. Will the city’s current water supply meet the plant’s needs or will it need to be upgraded? Show calculations to verify your answer.
- From the figure below, construct the truth table for the logic diagram. What function does this represent?

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