29_11_FSG

A futuristic automotive engineering lab with advanced technology and vehicles, showcasing automotive components, calculations, and diagrams.

FSG Technical Knowledge Assessment

Welcome to the FSG Technical Knowledge Assessment! This quiz is designed to challenge your understanding of automotive engineering concepts, signal interference, forces in mechanics, and various calculations related to vehicles.

Test your knowledge with questions that cover:

Electromagnetic interference in automotive systems
Vehicle dynamics during acceleration
Calculations involving forces and pressures
Aerodynamics and sound levels in vehicles

11 Questions3 MinutesCreated by EngineeringEagle415

1. As soon as you turn on your cars inverters, you are measuring unacceptable levels of EMI interference coupling into many of your signal wires. What could be possible countermeasures to effectively reduce the interference transmission?

Wrapping sensitive electronic circuitry in aluminum foil and leave it floating

Designing ground and supply wires for all sensitive electronic circuits as long as possible and leading them away from the EMI source

Wrapping sensitive electronic circuits in grounded aluminum foil

3. Show that it is theoretically possible to use an 0603 package resistor (1,6mm x 0,8mm x 0,8mm, specific heat capacity 0,67 J/(g*K), density 3,21 g/cm^3) in you cars discharge circuit as discharge resistor by calculating the temperature rise after a one-shot discharge surge from your fully charged 450V, 320uF intermediate capacitors (assume no loss in heat absorption). Explain why it is still a bad idea to implement such a solution by selecting all properties from the list below, that could contribute to a fault as a direct cause:

4. The cat of a FSG technical inspector falls down from the fifth floor balcony (15m height to ground). The cat is oriented with its back downwards to the ground when starting to fall with no initial rotational or translational speed. Using the inertia of the tail, the cat tries to turn around the x-axis, see figure for definition, until the feet point downwards. How long does it take to turn? How long does the cat fall? The cat is assumed to have a mass of 1.5kg. The tail has an rotational moment of inertia around the x-axis of 1.125gm2, the rest of the cat without the tail has an rotational moment of inertia around the x-axis of 4.8gm2. The tail has a maximum rotational angular speed of 21 rad/s around the x-axis. It is assumed, that the tail can be accelarated in no time. The aerodynamic drag coefficient is assumed to be cw = 0.8 independently of the orientation around the x-axis. The cats aerodynamic cross sectional area is given by 0.04m2, independently of the orientation around the x-axis. The air density is assumed to be 1.2kg/m", the gravitational accelaration is defined to be 9.9m/s2

Please enter

the time needed until reaching the ground in seconds rounded to the nearest two decimals.
the time needed to turn on the feet in seconds rounded to the nearest two decimals

Give your answer in the following format: time needed until reaching the ground, time needed to turn on the feet. Example: if the time needed until reaching the ground is 12,34s and the time needed to turn on the feet is 23,45 then use 12.34, 23.45 as answer value.

6. The official standing at the finish line and waving the finish flag hears the noise (single frequency) of an FS car as it approaches the finish line of the acceleration event. After crossing the finish line the single frequency noise of the FS car, when it is driving away from the official, is a major third lower than initially heard (f1/f2=5/4). At what speed did the vehicle cross the finish line? Assume the speed of sound is c = 340m/s and the speed of the FS car is constant over time. Also assume, that the distance between the official and the longitudinal axis of the FS Car is 0 mm. Give the answer in km/h and round to one decimal.

8.To improve EMI performance you want to implement a 0...200bar pressure sensor in your car that has a 4...20mA current output signal. The maximum pressure is 160bar and the receiving circuit shall have its maximum nominal measured voltage at <4V. The sensor has a total accuracy of 1%. Taking the next smaller value shunt resistor from the E96 series (including the respective series tolerance), what is the minimum voltage you have to set your receiving circuit´s cable fault detection upper limit to, in order to prevent false detection resulting from these tolerances (rounded to full Millivolts).

10. You are standing between a combustion vehicle, which is running idle and producing a 30 Hz tone at a sound pressure level of 103 dB(C) at your position, and an electric vehicle, which is sounding its 2 kHz tone as ready-to-drive sound at a sound pressure level of 80 dB(A) at your position. What is the non weighted combined sound pressure level measured at your position, considering that the sound sources are non-coherent and there are no other sound sources present? Answer in dB and round to 0 decimal places.

11. Calculate the coordinate of center of gravity in mm (dimensions in the figure are not exactly to scale). Round your answer to 2 decimals. Given is a = 10mm. The origin (x=0,y=0) is at the red dot and the dimensions of the shape are along the positive axes. Assume an evenly distributed area mass. Give your answer in the following format: x,y. Example: if x=12.34 and y=56.78 then use 12.34, 56.78.

29_11_FSG

FSG Technical Knowledge Assessment

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