29_11_FSG
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
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
2. You are accelerating straight proportional with 6m/s^2 in your FS Car which offers you perfect traction conditions. What is the velocity [m/s] in the tire Point B after the acceleration event distance? [m/s]
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:
Current
Power
Voltage
Temperature Coefficient
Resistance
Accuracy
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
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.
7. Calculate the force FBx for the given bracket when a force F=880 N is applied at the point of the thick red arrow, given the dimensions l1=45mm and l2=55mm. Answer in Newton and round to 0 decimal places. (Picture 2)
720
-720
1076
-880
-1076
880
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).
9. Given a vehicle with an inner wheel steering angle (si) of 25 degrees, a wheelbase of l=2586 mm, a trackwidth of j=719 mm and a scrub radius of 0. Calculate the outer wheel steering angle (sAa) in degrees (round to 2 decimal places) using the given "Ackermann-Equation". (Picture 1)
22,97
22,86
22,34
22,43
22,13
22,52
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.
183
103
100
180
106
109
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.
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