Quiz is on the Honor System:
You can look over any notes, websites, etc you wish.
But we are expecting that your answers will be your own,
and not developed in consultation with fellow students
unless you want to submit your answers as a team.

Grading: If you as an individual answer 6/10 questions
correctly you will pass; if your team answers 8/10
correctly both members of the team will pass.

If you pass, you will be awarded a Get-Out-FTQ-Free card that
you can use once in the future. You should use the card before the FTQ
is asked, to conserve question-making energy.

Try to fill in the answers on this form: hand in under my office door at class on Monday.
Deadline for handing in answers is 10a.m. Monday Nov 22.

1. (a) What does the S in NHTSA stand for?

(b) What events led NHTSA to mandate by when that all tires on cars sold in the US should have pressure-sensing and report capability?

2. Go to the Lectures section of the EN123 website and access the PowerPoint slide presentation of John Powning. Print out slide 8, on bulk micromaching. Mark on the right side figure where the strain gauges are placed.

3. What microprocessor (TI part) is used to process information in the pressure-sensing system? The microprocessor in programmed in Embedded C.

4. Reference slide 9 in the online presentation of Powning's talk. Remember how area and distance between plates determines capacitance. In the diagaram on the lower left of slide 9, what causes the capacitance to change as a function of pressure?

5. At what UHF frequency is pressure information from the TI sensor transmitted to a data storage and display unit?

6. Over what temperature range do the NHTSA specs say the pressure sensor must operate?

7. Do batteries have a harder time at the lowest or highest temperature of the spec range?

8. What kind of circuit are the diffused resistors of the sensor placed in?
a. Voltage divider
b. Wye-Pi circuit
c. Wheatstone bridge
d. Op-amp feedback
e. Superconducting Quantum Interference Device (SQUID)

9. What brand of digital multimeter is used in the Laboratory Test System of TI?

10. Since each tire transmits pressure on the same UHF frequency to a central data receiver in the car, how can the system know which tire is transmitting which packet of data?