Coursera Quiz

  The following image shows 4 signals in the circuit. The ground (0 volt) levels for the red, blue and green traces are all set coincidently where the blue Ch3 flag is located, 1 division from the bottom of the screen (see scale in white at right). The gain for the yellow trace (Ch 4, top) is set to 2 v/div and it’s ground level is located 3 divisions from the top of the screen (see scale in yellow). The power supply voltage for the motor is 4.3 volts. Each of these signals appears at one of the GPIO pins. 1. Green 2. Red 3. ---- 4. 0.2 amps 5. Blue 6. Yellow 7. 310 amps 8. 2 amps 9. yes 10. true 11. ----- 12. it decreases 13. ----- 14. it allows the code to read the peak current 15. ----- he following image shows 4 signals in the circuit.  The ground (0 volt) levels for the red, blue and green traces are all set coincidently where the blue Ch3 flag is located, 1 division from the bottom of the screen (see scale in white at right).  The gain for the yellow trac...

Consider the 9 scope shots labeled “Waveform 1 through Waveform 9”.   Waveform 1 shows the open loop step response of the L-C circuit model, i.e., how the output (green) looks in response to a step change in input (red) with no feedback (Kp, Kd and Ki all zero).   All waveforms use the exact same code except for a change in one of the 4 control gains (Kp, Kd, Ki and FF). The PID control is implemented in the file main.c.   In all case, consider only the rising edge and settled value as circled.  Due to circuit limitations, the falling edge response cannot be controlled properly since the input cannot go negative.   --- What was changed to the control system to create waveform 2 from waveform 1?  (Concentrate on the circled areas)   the feedforward term was increased ---Consider just the initial rising step and settled value. Compared to waveform 2, waveform 3 has:  kd set to -1000 --- What control variable changed goi...

---Which one of these semiconductor processes is unique to MEMS construction?  Bulk Micromachining ---Which one of these semiconductor tools, processes or chemicals are used in Photolithography? Resist Spin coating ---Which one of these semiconductor tools, processes or chemicals are used in Surface Micromachining? Sacrificial material layer Etching chemical Photoresist  ---Which one of these methods of wire bonding cannot possibly be done using aluminum wire? Thermosonic  ---Why is aluminum wire used for wire bonding of power electronic circuits?  Gold wire is too expensive  ---Which process can be used to perform both ball bonding and wedge bonding? Thermosonic ---What design requirements for a pressure sensor housing would lead you to construct it out of plastic material? The maximum pressure rating is one bar or below It needs to be very low cost   ---What is the purpose of the faceted mirror in the IR motion detector? It prevents visible light from hit...

---Using the empirical curves shown in the video on “Radar Level Sensors”, slide entitled “Power Loss vs. Distance, Frequency, and Antenna Diameter”, what is the absolute value of the power loss in dB using a 6 inch antenna with a 5.8 Gigahertz signal at a distance of 15 meters? (Type in an integer.) 50 ---You want to install a new pulsed radar level transmitter in your old liquid storage tank. You know that the tank is constantly being filled and emptied of fluid, which creates large ripples on the surface. In addition, the top is not flat, so you are concerned about misalignment of the antenna relative to the surface of the liquid after you install it. What frequency range should you select for the transmitter? 6-11 GHz  ---Why do LIDAR systems rotate the laser and detector? In order to limit the total energy received by any one detector   --- Why do you find it difficult to accurately detect the speed of a vehicle moving directly towards your car, while a LIDAR s...

---You decide to use the Endpoints method of linearization to linearize a Type K thermocouple curve between 1000°C and 1050°. A screen shot of the data points from the www.NIST.gov web site is shown below. What do you calculate for the slope of the line using the Endpoints Method in millivolts per °C? (Type in a 4-decimal number.)   0.039 ---You decide to use the End Points method of linearization to linearize a Type K thermocouple curve between 1000°C and 1050°. A screen shot of the data points from the www.NIST.gov web site is shown below. How far off away from the actual voltage (in positive millivolts) is your End-points line at 1025°C, the mid-point of the curve between 1000°C and 1050°C? (Type in a 4-decimal number, which represents the absolute value of the error) 0.0035   ---You decide to use the method of temperature compensation on a pressure sensor featured in our video on Temperature Compensation. You are compensating the sensor solely between the n...

1 . A piezoelectric accelerometer has a damping ratio of 0.65, a proof mass of 0.5 grams, and a spring rate of 10,000 N/mm. What is the damped natural frequency in hz of this device? (Type in an integer) Hint: Make sure your units of measure are consistent first, then use the formulae to calculate the natural and damped natural frequencies. 17104 2. A series RLC circuit has a resistance of 6.0 ohm, a capacitance of 5882 microfarads, and an inductance of 100 millihenries. What is the x location in rad/sec of the pole s1 ? (Type in a one-decimal number, make sure to use the – sign for a negative integer) Hint: Make sure your units of measure are consistent first, then use the formulae to calculate the natural and damped natural frequencies, as well as the damping ratio. 3.A series RLC circuit has a resistance of resistance of 6.0 ohm, a capacitance of 5882 microfarads, and an inductance of 100 millihenries. What is the y location in rad/sec of the pole s1. (Type ...