Exam. 1-B |
Automotive Engineering II |
1 |

Student Name: |
Student No. 101- - |

__1- A) Define the
following:__

a- Coefficient of air
resistance (air drag coefficient)- C_{d}

b- Car wheel base (b)

c- Car inertia resistance (IR)

d- Lateral stiffness (C_{a})

e- Tail wind

f- Neutral Steer

2- A) Draw the FBD of a car
of mass (m), moving up hell having a slope (θ)^{o}, if the car has
a wheel base (b), and the height of the center of gravity (CG) is (h) m from
the ground, and (x) m behind the front axle.

b) Find the weight on the
front and rear axles (W_{f}, W_{r}), if:

m |
1200 kg |

θ |
10 |

b |
3.2 m |

h |
0.6 m |

x |
1.2 m |

3- A) A car has mass (m) 1300
kg, and coefficient of rolling resistance (f_{r}) of 0.018, and a
frontal area (A_{f}) of 2.0 m^{2}. If its drag coefficient (C_{d})
is 0.5, and the air density (ρ) is 1.2 kg/m^{3}. The car velocity
at maximum tractive effort at direct drive is 81 km/h. Find

a- __The rolling resistance
of the car (RR) __

b- __The air resistance of the
car__ (AR), if it is moving against wind (head wind) of 9 km/h

c- __The maximum
acceleration__ (a) in this condition if the maximum tractive effort (TE) at
that velocity is 1200 N.

4- __Find the inner angle (δ _{i})__
of steering if the outer steering angle (δ