Quiz „General Engineering“

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1. Calculate the cornering speed during Skidpad (you can use the centerline radius in the rules) using following information:

μ_y = 1.4, m = 240 kg, c_L = 3.2, A = 1 m^2, ρ = 1.1 kg/m^3

It is assumed, that there is no weight transfer and all 4 tires are at the optimal grip level. Answer in m/s rounded to one decimal place.

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2. The previous season you could recuperate only 25% of your initially stored energy, but this season a big improvement in your drivetrain allows you to recuperate 63% of the initially stored energy. Knowing that you had 9.6 kWh of energy in your accumulator during the last season, how much energy must your new accumulator have, if you assume, that it’s the same length and speed? Give answer in kWh to one decimal place.

E_new = E_old * (1+0.25)/(1+0.63)

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3. A racing car rolls to a stop on a horizontal course with an initial speed of v. It deceleratesonly by friction with a rolling resistance of μF, which is supposed to be independent ofthe current velocity.What is the distance s the car needs to stop?v = 300 km/h, μF = 0.15, g = 9.81 m/s2.Give your answer in meters, rounded to four significant places.

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4. Calculate the Normal force on the rear left tyre during the first skidpad lap. You can assume, that your vehicle is in a steady-state condition and that there is no longitudinal acceleration. Further it can be assumed, that all 4 wheels have a lateral grip coefficient of 1.4. You can use the centerline radius stated in the rules. Following information regarding the vehicle are given. Give answer to nearest whole number in Newtons.

m = 220 kg

Cl = 3.8

A = 1 m^2

Rho = 1.1 kg/m^3

Wheelbase: L = 1.53

Trackwidth:t = 1.2 m

Height of CG: h = 0.2 m

Weight distribution/COP: 50%

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5. A vehicle with the mass 190kg, wheelbase 1,56m and tyre static radius 222mm is weighed. Scales measure 83kg (front) and 107kg (rear) when the car measured on the perfectly flat ground and the same values when the front axle is elevated by 0,85m. What is the car’s COG height? Give answer to the nearest whole number in mm

Fb‘ = m*g (at rear axle while front tyres are lifted)

Fb = m*g (at rear axle while car standing on ground)

Fg = m*g (at COG)

L = wheel base

sin(θ) = H/L

r= radius of tyre

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6. Three inductors are connected as shown in the following figure:

Given that L1 = 2L2, find L1 and L2 such that the equivalence inductance is L = 0.7 H.Give your answers in Henry, rounded to three decimal places separated by a comma (L1, L2)

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7. Before the endurance you pump nitorgen in your tires at a temperature of 20°C and 0.7 bar relative pressure. Knowing, that during the endurance the maximal tyre temperature will be around 60°C, what will be the maximal relative pressure of the tyre? Give answer in bar to two decimal places.

p2 = p1 * (T2/T1)

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8. During last year acceleration a top speed of 100 km/h was reached. Due to big improvements in the new drivetrain, the new vehicle reaches a top speed of 120 km/h. The aerodynamics chief has some worries about the stability of the rear wing bracing due to the higher aerodynamics load. Given the geometry below, by how much % does the bearing force in point A change in comparison to last year? (The aerodynamic package did not change and therefore some values can be assumed for both vehicles). Give answer rounded to one decimal place.

CL=3.8 CD=1.2 A=1 m² rho=1.1 kg/m³ L1=50 mm L2= 100 mm H1= 125 mm H2= 165mm

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9. A spring in a car’s suspension has elastic potential energy store 226 J. If the spring constant is 8.1N/mm, find the extension. Give answer in meters to three significant figures.

E = 0.5 * k * e^2

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10. A spring in a church clock has a spring constant of 10 N/m. What is its elastic potential energy store if it is stretched 8 m? Give answer in Joules to three significant figures.

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Quiz „Electrical“

1. Which of the following requirements of the brake light assembly must be met to be rules compliant? (multiple choice)

See FSG rules 2023: T6.3

2. A thin circular, isolated wire made of copper with radius R lies on a table with its endsconnected to a Volt meter. Another, straight wire lies exactly along a diameter of thecircular wire, connected to an alternate current source i(t) = I0 sin(wt).The experimental setup is shown in the following Figure:

Which effective voltage Ueff does the Volt meter display?R = 10 cm, maximum current I0 = 1 A, f = 50 Hz.Give your answer in Volts with three decimal places

The magnetic field lines H around the straight, current-carrying wire run in concentric circles, with their centres lying on the wire axis. The field lines thus enter the wire perpendicularly in one half of the circle and leave it perpendicularly in the opposite half. This means that one semicircle of the induction loop is penetrated by the time-varying magnetic flux (t), while the opposite semicircle is penetrated by exactly the opposite flux -(t) for reasons of symmetry. The total flux at any time is zero at all times, which means that no induction voltage and thus no effective voltage Ueff is indicated at any time. The specification of the data in the task was therefore completely superfluous.

3. Your head of powertrain has found a battery cell with excellent specifications and yet cheap. He decides upon a 142s2p accumulator configuration using the cells with a capacity of 5.8 Ah. The manufacturer specifies an internal impedance of 1.5 mOhm. However, after a while you notice the cells are of horrible quality and their real capacity varies significantly leading to an unbalanced accumulator.

He performed experiements to find an approximation of the cells SoC relation to their open-circuit voltage (EMF) as shown in the following figure:

Assume due to imbalance, exactly half of the accumulators cells are at 40% SoC and half at 80% SoC. What current will be drawn at the maximum allowed power usage? Give answer in Amps to nearest whole number

40% SoC -> 3.7V and 1.6 mΩ and 80% SoC -> 3.8V and 1.2 mΩ, total open-circuit voltage

71*3.7 + 71*3.8 = 532.5V

Total impedance = 71 * (1.6m/2) + 71*(1.2m/2) = 99.4mΩ

V*I = I^2*R * 80kW

I = 155 A

4. Which of these HV- and LV-components have to be fire-retardant? (Multiple Choice)

See FSG rules 2023: EV5.3.4, EV5.4.6, EV5.5.12

5. How long will it take to discharge C1 below 60V using the following constant current sink if it is initially charged at 565V? (MOSFET’s VGSth: 4V) Give answer to two decimal places in secs.

Circuit’s current: MOSFET will operate in linear zone, close to the activation voltage. Therefore, as VGSth is 4V, VS can be taken as 8V. From these 8V and the 47R current limiting resistor, the discharge current of the circuit will be 8/47->0,17AAs the constant current discharge of a capacitor depends on capacity, as V=i·t/C->t=V·C/i=(565-60)·0,0012/0,17=3,56s

6. The following processes have to be measured by the AMS. (Multiple choice)

See FSG rules 2023: EV5.8.1, EV5.8.1 & EV5.8.3, EV5.8.10

7. Your team is considering two languages, Verilog and VHDL, for programming an FPGA. Which languages could be used?

8. The previous season you could recuperate only 27% of your initially stored energy, but this season a big improvement in your drivetrain allows you to recuperate 69% of the initially stored energy. Knowing that you had 6.3 kWh of energy in your accumulator during the last season, how much energy must your new accumulator have, if you assume, that it’s the same length and speed? Give answer in kWh

E_new = E_old * (1+0.27)/(1+0.69)

9. Which statements about the travel of the driving pedal is correct

FSG Rules 2023: T11.8.1, T11.8.5

10. You want to drive with a Lithium Polymer Cell with 3.2 Ah and weighing 70 g. Which of the following configurations would be allowed by the rules? Hint: Unorm = 3.7 V, Umax = 4.2 V

Quiz „Intermediate“

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1. To build your race car you need a part what can be bought on the public market for 400 EUR per piece. Your plan is to sell 1300 race cars the next five years. If you will manufacture the part by yourself, you need an investment of 400.000 EUR for the installation. Furthermore, you need to pay 25.000 EUR per year for the machine operator. The material costs are 75 EUR per piece. The machine cannot be sold after the usage. What is the cost of one piece of the own manufactured parts? Give answer as one whole number

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2.

The Electrical System Officer must: (Multiple Choice)

See FSG Rules 2023 A4.3.6, IN9.2.2 (& A4.3.3, A6.7.2), D7.5.2 & A4.4.2

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3. Your team recieves 59.3 points for their autocross run. The fastest time overall was 71.9 secs. How long was your team’s fastest run? Round to one decimal place.

See FSG Rules 2023 D6.3.2 & D9.1.7

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4. How many points are assigned for the pitch video in the Business Plan Presentation Event?

See FSG Rules 2023 S1.4.1

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5. What is the volume of the smallest allowed head restraint? Give answer to two decimal places in m^3

See FSG rules 2023:

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6. How many sets of dry tyres are allowed to be used during one event?

See FSG Rules 2023 D3.2.4

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7. What is the maximum length of time allowed for the driver change in endurance, in order to recieve no penatly?

See FSG Rules 2023 D7.5.4

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8. To build your race car you need a part what can be bought on the public market for 450 EUR per piece. Your plan is to sell 1200 race cars the next five years. If you will manufacture the part by yourself, you need an investment of 400.000 EUR for the installation. Furthermore, you need to pay 20.000 EUR per year for the machine operator. The material costs are 50 EUR per piece. The machine cannot be sold after the usage. What is the cost of one piece of the own manufactured parts? Give answer as one whole number

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9. How far is the car tipped during the tilt test?

See FSG Rules 2023 IN7.1.3

See FSG Rules 2023. Correct answers:

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10. Which statements are correct? (multiple choice)

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11. Your team completes their best autocross run in 71.9 secs but goes off course once and knocks over two cones. The fastest team overall completed their run in 73.2 secs. How many points did your team recieve for autocross? Round to one decimal place.

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12. How many percentage of points is the Cost Understanding in the Overall Cost and Manufacturing Event?

See FSG Rules 2023 S2.10.1

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13. What is the minimum height of the characters of the car number?

See FSG Rules 2023 T12.1.2

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14. In which currency must the costs be displayed in the CBOM?

See FSG Rules 2023 S2.6.4

Steps:

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15.

Assuming the skid pad event has only two participants, both EV without driverless. Team A and Team B: calculate the score rounded to two decimals for the team scoring the lower amount of points using the following data.

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16. What are requirements of using a standard Impact Attenuator?

See FSG rules 2023: T3.19.1 & T3.19.4

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17. What is the maximum duration of the Business Plan Presentation?

See FSG Rules 2023 S1.2.1

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18. Your team completes their best manual skidpad run in 5.1 secs but goes off course. The fastest team overall completed their run in 4.6 secs. How many points did your team recieve for skidpad? Round to one decimal place.

See FSG Rules 2023 D4.4.3 & D9.1.7

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19. What does the yellow and red striped flag mean during Endurance and Autocross Event?

See FSG Rules 2023 D2.1.10

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20.

The following items have to be on or attached to the push bar, if you are an EV team. (multiple choice)

See FSG 2023 Rules T13.1

Quiz „Basics“

1. What is the diameter of the outside skidpad circle?

See FSG Rules 2023 D4.1.2

2. The car is tipped to 60° during the tilt test?

3. How far is the car tipped during the tilt test?

4. What is the minimum tread depth of the wet tires?

See FSG Rules 2023 T2.6.1

5. What is the minimum allowed static ground clearance, including driver?

See FSG Rules 2023 T2.2.1

6. In which currency must the costs be displayed in the CBOM?

7. What is the minimum height of the university name and the car number added together?

See FSG Rules 2023 T12.2.2 and T12.1.2

8. What is the length of the acceleration track?

See FSG Rules 2023 D5.1.1

9. How long is water sprayed on the car during the rain test?

See FSG Rules 2023 IN9.2.7

10. How many points are assigned for the BOM and BOM discussion in the Cost and Manufacturing Event?

11. Each team must have two 0.8kg fire extinguishers.

See FSG Rules 2022 T13.4.1

12. Which of the following requirements are a must for all non DV electric cars with wings, when moving the vehicle on the competition site? (Multiple choice)

See FSG Rules 2023 A.6.7

13. What is the maximum amount of points a EV team can recieve at an event?

See FSG Rules 2023 A1.2.5

14. How many events may a driver drive during a competition?

See FSG Rules 2023 D1.1.2

15. What does a black flag mean?

See FSG Rules 2023 D2.1.3

16. Which of the following documents is directly evaluated during Engineering Design Event?

See FSG Rules 2023 S3.4.1

17. An official has the right to remove the scrutineering sticker from the car, if the car is no longer rule compliant.

18. How many pages of text are allowed in the Engineering Design Report? (Multiple choice)

See FSG Rules 2023 S3.2

19. How many sets of dry tyres are allowed to be used during one event?

20. What is the penatly for driving off course during endurance?

See FSG Rules 2023 D9.1.7

You only have 10 mins to answer all 4 questions!

Sorry, times up!

Quiz „FSG Multiple Choice“

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1. In the following there are multiple statements abount the rules. Which statements are correct?

See FSG Rules 2023

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2. According to the FS Rules and the competition handbook: Which statements are true?

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3. Mark all true statements according to the FS Rules

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4. In which cases will team members be denied their on-site member pass?Mark all correct answers!