Quiz Preparation – UMD Racing e.V.

Quiz „Basics“

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1. What needs to be considered when entering the Dynamic Area?

a. Wearing dynamic vests

b. Having the car nearby

c. Wearing a Helmet: FIA 8860-2010, FIA 8860-2018

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2. Which of the following requirements is a must for all types of vehicles, when moving the vehicle on the competition site?

a. A registered driver wearing the required driver equipment as defined in T 13.3 including helmet, arm restraints and balaclava having full control of steering and braking

b. Two team members walking on either side of the vehicle

c. Detached master switch

d. Vehicles must be pushed at a normal walking pace by means of a red pushbar, equipped with a fire extingusher

See FSG Rules 2023 A.6.7

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

a. 250 mm

b. 150 mm

c. 50 mm

d. 200 mm

See FSG Rules 2023 T12.2.2 and T12.1.2

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4. How many percentage of points are the Finances in the Business Plan Presentation Event?

a. 20 %

b. 15 %

c. 25 %

d. 10 %

See FSG Rules 2023 S1.4.1

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

a. 60.75

b. 10

c. 50.0

d. 115

See FSG Rules 2023 S2.10.1

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6. Which of the following is true about presenting the vehicle for static judging?

a. The vehicle may be presented without having passed Technical Inspection

b. The vehicle must have passed Technical Inspection

c. The vehicle must be presented without bodywork

7 / 10

7. How many numbers of skidpad runs does a team have?

a. 4

b. 2

c. 1

8 / 10

8. What is the minimum tread depth of the rain tires?

a. 2.3 mm

b. 2.2 mm

c. 2.1 mm

d. 2.4 mm

See FSG Rules 2023 T2.6.1

9 / 10

9. What is the penatly for driving off course during acceleration?

a. 2 secs

b. disqualified

c. did not finish

d. 30 secs

See FSG Rules 2023 D9.1.7

10 / 10

10. How many different tyre sizes can be used on a car during an Autocross run?

a. 4

b. 2

c. Isn’t mentioned in the rules

d. 1

See FSG Rules 2023 T2.6.2

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Quiz „Electrical“

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1. 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

2 / 10

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

a. Both layers of the fire wall including the material that bonds them together

b. Spare TSAC

c. A device above the segments to prevent arc flashes

d. A dividing element between the main fuse, the AIRs and the rest of the TSAC

e. Every wire used inside of the TSAC

f. An LV energy storage with a lithium iron phosphate chemistry

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

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3. Which of the following statements regarding the Brake System is false?

a. The brake over travel-switch must be of the type single pole, single throw switch

b. The first 90 % of the brake pedal travel may be used to regenerate brake energy without actuating the hydraulic brake system. The remaining brake pedal travel must directly actuate the hydraulic brake system, but brake energy regeneration must not remain active

c. Unarmored plastic brake lines are prohibited

d. The brake pedal and its mounting must be designed to withstand a force of 2kN without any failure of the brake system

See FSG rules 2023: T6.1.10

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

a. The brake light must be functioning even if HV- or LV-power supply failed or is being disconnected

b. The brake light must be a red light on a black surface

c. Clearly visible from the back at bright sunlight with a viewing angle of at least 30°

d. The brake light measures least 10 cm2 with an even level of brightness

e. The brake light must be illuminated when driving into the driver change area

f. The shape of the break light can be a square or a circle

See FSG rules 2023: T6.3

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

a. Both

b. Only VHDL

c. Neither of these

d. Only Verilog

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6. 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

a. 6 compartments in series with 4p28s configurations

b. 4 compartments in series with 6p26s configurations

c. 4 compartments in series with 4p32s configurations

d. 5 compartments in series with 4p22s configurations

7 / 10

7. Your BSPD has been triggered although the driver did not touch the driving pedal. What could have gone wrong? (multiple choice)

a. Sensors are out of range

b. The AMS signals a power of over 5kW and triggers the BSPD

c. A sensor input is shorted to Ground

d. The springs from the driving pedal are torn in two

e. Software parameters are set wrong

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8. 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->0,17A
As 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

9 / 10

9. Which of the following statements about LV battery packs with lithium based chemistry other than LiFePo4 is not true?

a. They must be enclosed in a non-conductive, waterproof and acid resistant container

b. They must be in a rigid and sturdy casing

c. They must be protected from short circuits, not more than 100 mm from ungrounded terminals

d. They must include overcurrent protection that rips at or below the maximum specified discharge current of the cells

See FSG rules 2023 T11.7.7

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10. How much current flows when 99 C passes down a wire in 11 s? Give answer in amps as a whole number.

Q = I * t

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Quiz „General Engineering“

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In a cylinder, air is compressed isothermally at ambient temperature (

θ_U=20∘C)

p_{1} = 0.1 MPa

p_{2} = 0.5 MPa

Calculate the change in the specific entropy of the air in the cylinder.

Round to two decimal numbers sperated by a point. Input in J/(kgK). (Example -365.26)

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2. 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

draw all forces working on car and create balanced equation.
Fb‘ * L*cosθ – Fg * |AC| = 0 (rotated around point at A)
|AC| = |AB| + |BC| = (h – r) * sinθ + a * cosθ
a = L * (Fb/Fg)
Final formula: h = (Fb‘- Fb)/Fg × L × cot(θ) + r

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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3. A water tank under a pressure of p = 117.72 kPa has three pipes connected to it, which are sealed 5 meters below the water surface by three plates with areas A₁, A₂, and A₃.
Task:
Sort the pressures p₁, p₂, and p₃ according to their magnitude.

a. p2>p1>p3

b. p1>p2>p3

c. p2=p1>p3

d. p1=p2=p3

e. p2>p3>p1

4 / 10

An air stream

dot{M}_L = 5.5 kg/s,

cp_L=1 kJ/(kgK)

is to be heated in a plate heat exchanger from

θ_L′=20∘C

θ_L′′=150∘C

. For this purpose, a flue gas stream

dot{M}_R = 7.22

cp_R=1.1 kJ/(kgK)

with a temperature of

θ_R′=300∘C

is available. The overall heat transfer coefficient is

W/(m^2*K)

.
What is the required heating surface AAA if the fluid streams are arranged in counterflow?

a. 314,12 m^2

b. 328,1 m^2

c. 281,7 m^2

5 / 10

5. 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.

Formula for max corning speed:
(m*g + 0.5*rho*A*Cl*v^2)*μ = m * (v^2)/R

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6. 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.

E = 0.5 * k * e^2

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7. A refrigeration unit cools water of mass 3 kg by 33 °C. Find the thermal energy removed from the water. The specific heat capacity of water is 4186 J/kg celsius. Give answer to three significant figures in kJ.

density (rho) = m / V

8 / 10

A metal piece heated to

θ_1,M=1000∘C

with a mass of

M_M=6.5 kg

was cooled in a completely heat-insulated iron container filled with water. The mass of the water in the container is

M_W=10 kg

and the mass of the container is

M_B=2 kg.

The initial temperatures of the water and the container were the same and amounted to

θ_1,W=10∘C

. After complete thermal equilibrium between the immersed metal piece, the water, and the container, a temperature of

was established.
What is the average specific heat capacity of the metal piece

c

in the temperature range between

and

Input the result in kJ/(kg*K), round to 3 decimal numbers sperated by a point (example: 0.136).

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9. 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

Create an equation with all forces rotated at point B: Fl*L1 + Fd*H2 + Fa*(L2-L1) = 0
Rearrange for Fa
Calculate force Fa with previous year speed
Calculate force Fa with this years speeed
Calculate the change in force in percentage.

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10.

What temperature would occur at the stagnation point of an aircraft flying at a speed of

V_{1} = 2000 km/h

, assuming that the air behaves as an ideal gas under these conditions? The temperature of the undisturbed air is theta_1 = -30°C.

a. 308,.64°F

b. 177.06°F

c. 254.53°F

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