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Introduction to Automotive Engineering > Introduction to Vehicle Dynamics > Flashcards

Introduction to Vehicle Dynamics Flashcards

1
Q

What is the correct formula for Newton’s Law in vehicle dynamics?
a) ΣF = mv
b) ΣF = ma
c) ΣF = m/a
d) ΣF = a/m

A

b) ΣF = ma

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2
Q

Which of the following is NOT a longitudinal force acting on a vehicle?
a) Aerodynamic Drag
b) Traction Force
c) Rolling Friction
d) Centrifugal Force

A

d) Centrifugal Force

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3
Q

The aerodynamic drag force is approximately proportional to:
a) Velocity
b) Velocity squared
c) Velocity cubed
d) Square root of velocity

A

b) Velocity squared

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4
Q

In the equation for aerodynamic drag, what does Cd represent?
a) Cross-sectional area
b) Air density
c) Drag coefficient
d) Velocity

A

c) Drag coefficient

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5
Q

Which type of acceleration is dominant at high speeds?
a) Traction Limited Acceleration
b) Engine Limited Acceleration
c) Constant Acceleration
d) Negative Acceleration

A

b) Engine Limited Acceleration

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6
Q

For engine limited acceleration at high speed, the engine force is approximated as:
a) F ≈ Hp × v
b) F ≈ Hp / v
c) F ≈ Hp + v
d) F ≈ Hp - v

A

b) F ≈ Hp / v

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7
Q

What is the correct formula for estimating top speed?
a) v_top ≈ √(Hp / (ρ Cd A))
b) v_top ≈ √(2Hp / (ρ Cd A))
c) v_top ≈ ∛(2Hp / (ρ Cd A))
d) v_top ≈ (2Hp / (ρ Cd A))

A

b) v_top ≈ √(2Hp / (ρ Cd A))

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8
Q

If you want to double the top speed of a vehicle, by how many times do you need to increase the horsepower?
a) 2 times
b) 4 times
c) 6 times
d) 8 times

A

d) 8 times

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9
Q

For the 2005 911 Carrera, what was the difference between the calculated top speed and the actual top speed?
a) 62 km/h
b) 52 km/h
c) 42 km/h
d) 32 km/h

A

a) 62 km/h

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10
Q

Which of the following is NOT mentioned as a main topic in vehicle dynamics in the lecture outline?
a) Longitudinal motion
b) Lateral motion
c) Ride
d) Fuel efficiency

A

d) Fuel efficiency

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11
Q

What is the correct formula for the differential equation of motion in vehicle dynamics?
a) dv/dt = ΣF(v,t) × m
b) dv/dt = ΣF(v,t) / m
c) dv/dt = m / ΣF(v,t)
d) dv/dt = ΣF(v,t) + m

A

b) dv/dt = ΣF(v,t) / m

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12
Q

In the equation for rolling friction (R_r), what does k represent?
a) Kinetic energy
b) Tire property
c) Air density
d) Cross-sectional area

A

b) Tire property

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13
Q

Which of the following is NOT considered a “road load”?
a) Aerodynamic drag
b) Rolling friction
c) Traction force
d) Both a and b are road loads

A

c) Traction force

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14
Q

At what speed range does traction limited acceleration predominantly occur?
a) High speed
b) Medium speed
c) Low speed
d) All speeds equally

A

c) Low speed

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15
Q

In the equation F ≈ Hp/v, what does Hp represent?
a) Horse power
b) High pressure
c) Horizontal position
d) Hydraulic pressure

A

a) Horse power

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16
Q

According to the lecture, why is the transmission (gear ratio) not included in the high-speed acceleration analysis?
a) It’s not relevant at high speeds
b) It’s too complex to model
c) Hp at the wheels and engine are approximately the same regardless of gear ratio
d) The lecture doesn’t provide this information

A

c) Hp at the wheels and engine are approximately the same regardless of gear ratio

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17
Q

What is the primary factor limiting acceleration at high speeds?
a) Engine power
b) Aerodynamic drag
c) Rolling friction
d) Tire grip

A

b) Aerodynamic drag

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18
Q

How many times more horsepower does the Bugatti Veyron have compared to the 2005 911 Carrera?
a) 2 times
b) 3 times
c) 4 times
d) 5 times

A

b) 3 times

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19
Q

Which of the following is NOT mentioned as a component of vehicle dynamics in the lecture outline?
a) NVH (Noise, Vibration, and Harshness)
b) Handling
c) Fuel consumption
d) Longitudinal motion

A

c) Fuel consumption

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20
Q

In the equation for estimating top speed, what does ρ represent?
a) Engine power
b) Air density
c) Drag coefficient
d) Vehicle mass

A

b) Air density

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21
Q

What is the primary focus of the “Longitudinal” section in the lecture outline?
a) Acceleration and Braking
b) Handling and Steering
c) Noise and Vibration
d) Fuel Efficiency

A

a) Acceleration and Braking

22
Q

According to the lecture, what is the correct relationship between velocity (v) and acceleration (a)?
a) v = da/dt
b) a = dv/dt
c) v = a/dt
d) a = v/dt

A

b) a = dv/dt

23
Q

In the equation for aerodynamic drag, what does A represent?
a) Air pressure
b) Acceleration
c) Cross-sectional area
d) Altitude

A

c) Cross-sectional area

24
Q

Which of the following factors does NOT affect the aerodynamic drag of a vehicle?
a) Shape of the car
b) Cross-sectional area
c) Air density
d) Engine horsepower

A

d) Engine horsepower

25
Q

What is the primary difference between engine limited acceleration and traction limited acceleration?
a) The speed range at which they occur
b) The type of engine used
c) The road surface condition
d) The vehicle’s weight

A

a) The speed range at which they occur

26
Q

According to the lecture, what happens to the engine force (F) as speed increases at high speeds?
a) It increases
b) It remains constant
c) It decreases
d) It fluctuates randomly

A

c) It decreases

27
Q

In the equation for estimating top speed, what does Cd represent?
a) Car density
b) Drag coefficient
c) Drive ratio
d) Dynamic pressure

A

b) Drag coefficient

28
Q

How many times more expensive is the Bugatti Veyron compared to the 2005 911 Carrera?
a) About 5 times
b) About 10 times
c) About 12.5 times
d) About 15 times

A

c) About 12.5 times

29
Q

What is the difference between the calculated and actual top speed for the Bugatti Veyron?
a) 50 km/h
b) 75 km/h
c) 100 km/h
d) 125 km/h

A

c) 100 km/h

30
Q

Which of the following is NOT mentioned as a component of vehicle dynamics in the “Ride” section of the lecture outline?
a) Suspension system
b) Tire characteristics
c) Road surface quality
d) Engine vibration

A

d) Engine vibration

31
Q

Which of the following is NOT a basic motion of a vehicle?
a) Pitching
b) Rolling
c) Yawing
d) Drifting

A

d) Drifting

32
Q

What is the term for the angle between a tire’s actual direction of travel and its intended direction?
a) Yaw angle
b) Slip angle
c) Steering angle
d) Camber angle

A

b) Slip angle

33
Q

In vehicle dynamics, what does understeer refer to?
a) The vehicle turns more than intended
b) The vehicle turns less than intended
c) The vehicle maintains a neutral steering behavior
d) The rear wheels lose traction before the front wheels

A

b) The vehicle turns less than intended

34
Q

Which of the following is NOT a typical name for Electronic Stability Control systems?
a) StabiliTrac
b) AdvanceTrac
c) Vehicle Stability Control
d) Anti-Lock Braking System

A

d) Anti-Lock Braking System

35
Q

What is the main purpose of a Four-Wheel Steering (4WS) system?
a) To increase fuel efficiency
b) To improve handling at both low and high speeds
c) To reduce tire wear
d) To enhance acceleration

A

b) To improve handling at both low and high speeds

36
Q

In the context of NVH, what does the term “Harshness” typically refer to?
a) Loud noises
b) Continuous vibrations
c) Treatments of transient frequencies or shock
d) Air-borne sounds

A

c) Treatments of transient frequencies or shock

37
Q

Which of the following is NOT a way to treat structural vibrations in NVH?
a) Damping
b) Isolation
c) Amplification
d) Absorption

A

c) Amplification

38
Q

What is the primary function of Electronic Stability Program (ESP)?
a) To improve fuel efficiency
b) To increase engine power
c) To enhance cornering and control by preventing skids
d) To reduce brake wear

A

c) To enhance cornering and control by preventing skids

39
Q

In vehicle handling, what does “neutral steer” mean?
a) The vehicle understeers
b) The vehicle oversteers
c) The vehicle maintains the intended path without additional steering input
d) The vehicle cannot turn

A

c) The vehicle maintains the intended path without additional steering input

40
Q

Which of the following best describes the Ackermann steering geometry?
a) A steering system for high-speed cornering
b) A layout that allows the inner wheel to turn at a greater angle than the outer wheel
c) A system that reduces understeer
d) A method to eliminate tire slip angle

A

b) A layout that allows the inner wheel to turn at a greater angle than the outer wheel

41
Q

What is the primary function of the Ackermann steering geometry?
a) To reduce tire wear during cornering
b) To allow the inner wheel to turn at a greater angle than the outer wheel
c) To increase stability at high speeds
d) To minimize understeer in all conditions

A

b) To allow the inner wheel to turn at a greater angle than the outer wheel

42
Q

In the context of vehicle dynamics, what does “yawing” refer to?
a) Rotation around the lateral axis
b) Rotation around the longitudinal axis
c) Rotation around the vertical axis
d) Linear motion along the vehicle’s path

A

c) Rotation around the vertical axis

43
Q

Which of the following best describes the “slip angle” of a tire?
a) The angle between the wheel’s rotational axis and the road surface
b) The angle between the tire’s actual direction of travel and its intended direction
c) The angle of the steering wheel during a turn
d) The angle between the front and rear wheels during cornering

A

b) The angle between the tire’s actual direction of travel and its intended direction

44
Q

What is the main difference between structure-borne and airborne noise in NVH?
a) Structure-borne noise is generally below 1000 Hz, while airborne noise is above
b) Structure-borne noise is always louder than airborne noise
c) Airborne noise can only be treated with damping, while structure-borne noise requires barriers
d) Structure-borne noise is only present in electric vehicles

A

a) Structure-borne noise is generally below 1000 Hz, while airborne noise is above

45
Q

Which of the following is NOT a typical method for treating unwanted airborne sound?
a) Barriers
b) Absorbers
c) Amplifiers
d) Isolators

A

c) Amplifiers

46
Q

In the context of vehicle handling, what does “turn-in” refer to?
a) The point where the driver begins to apply steering input
b) The moment when oversteer begins
c) The process of reducing speed before entering a corner
d) The act of straightening the wheels after exiting a turn

A

a) The point where the driver begins to apply steering input

47
Q

What is the primary purpose of a scanning laser vibrometer in automotive NVH analysis?
a) To measure engine temperature
b) To detect and analyze structural vibrations
c) To improve fuel efficiency
d) To calibrate the steering system

A

b) To detect and analyze structural vibrations

48
Q

Which of the following best describes the function of a torsional vibration damper?
a) It reduces lateral movement of the vehicle body
b) It minimizes rotational vibrations in the drivetrain
c) It improves the vehicle’s aerodynamics
d) It increases the responsiveness of the steering system

A

b) It minimizes rotational vibrations in the drivetrain

49
Q

What is the main advantage of a Four-Wheel Steering (4WS) system at low speeds?
a) Improved fuel efficiency
b) Enhanced stability during highway driving
c) Reduced turning radius and improved maneuverability
d) Increased traction on slippery surfaces

A

c) Reduced turning radius and improved maneuverability

50
Q

In the context of Electronic Stability Control (ESP), what does the system primarily use to maintain vehicle stability?
a) Adjusting the suspension stiffness
b) Modifying the engine’s power output
c) Applying individual wheel brakes
d) Altering the steering ratio

A

c) Applying individual wheel brakes

Introduction to Automotive Engineering (5 decks)

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