Automotive Engineering I (Exercise Questions)

1-What are the units of the following quantities ؟(ما وحدات الكميات التالية)

Engine brake power (P_b)

Clutch torque capacity (T_c)

Engine angular speed (w)

Engine rotation speed (N)

Engine torque (T_e)

Engine indicated power (P_i)

Engine swept volume (V_e)

Clutch coefficient of friction (m)

Engine mechanical efficiency (h_m)

Force (F)

Pressure (p)

Stroke (L)

2- Rewrite the following units in other forms:

- Watt =

- Joule =

- Newton =

- Pascal =

3- The following data of a 4-stroke engine is known as:
The indicated mean effective pressure (imep), the cylinder bore (d_cy), and the stroke (L), the number of cylinders (n).

-Write down the following quantities using the above symbols

(أكتب الكميات التالية باستخدام الرموز الموجودة بعالية):

* The cylinder swept volume (V_c)

* The engine swept volume

* The force exerted on the piston (F)
* The indicated power (P_i)

* The work done by the force (W)
* The torque (T)

4- What are the differences between the following (ما العلاقة بين التالي) ?

- Engine Indicated (P_i) & Brake (P_b) powers
- Fuel consumption (FC) & Specific fuel consumption (SFC)

- Gross brake power  & Net brake power

- Engine Power & Engine Torque

- force & torque

- force & pressure

- force & work

- work & Power

5- What do those curves represent?

(ما الذي تمثله تلك المنحنيات)

And what are their units (وما وحداتها) ?

A:                               [        ]

B:                               [        ]

6- What are the differences between the following:

         4WD & AWD

         2-stroke engine & 4-stroke engine

7- A double-plate clutch has the following data:
The driven (frictional) plates have the following dimensions; the outer radius is (r_o), the inner radius (r_i). The driven plate lining has a coefficient of friction (m). If the spring force is (F_s), find the following:

Write down the following quantities using the above symbols

(اكتب الكميات التالية باستخدام الرموز الموجودة بعالية):

* The mean friction radius (r_m).

* The friction force (F_f) acting on the driven plate due to the normal force.

* The torque capacity (maximum transmitting torque) of the clutch (T_c)

8-Compare the following systems

	Advantages	Disadvantages
Front engine & rear-wheel drive
Front engine & front-wheel drive
Rear engine & rear-wheel drive
Four wheel drive

9- How to increase the following(كيف نزيد من قيمة التالي) ?

- Clutch torque capacity (T_c)

- Engine thermal efficiency (h_th)

10- (A) What are the parts of the friction clutch and what is the function of each part?

1-

2-

3-

11- The clutch friction plate shown has the following:

r_i = 0.07  m              , r_o = 0.09 m                  , m = 0.4

If this plate will fit with a single plate clutch with

multiple springs with total normal force (F_n) of

2800 N. Find:

a- the mean friction radius (r_m).

b- the friction force (F_f) acting on the plate due to

    the normal force.

c- the torque transmitted (T) by this clutch

12- The clutch friction plate shown has the following:

r = 0.08  m              , m = 0.4

If this plate will fit with a double-plate clutch with

a diaphragm spring. The torque of the clutch is

found to be 240 N.m. The clutch has a design

factor of 1.6. Find:

a- the normal force of the springs (F_n),

b- the engine torque,

c- the outer radius of the friction plate (r_o) if the inner

    radius (r_i) is 0.06 m.

13- (A) The following data of a four stroke engine is known as:

Cylinder clearance volume (V_c), number of cylinders (n), cylinder volume (V_s), indicated mean effective pressure (imep), engine rpm (N), engine brake power (P_b), specific fuel consumption (SFC).

- Write down the following quantities using the above symbols:

* The engine compression ratio (r)

* The engine indicated power (P_i)

* The mechanical efficiency (h_m)

B) What is the job of the clutch in the car?

C) What are the friction surfaces of the friction clutch?

14- The clutch friction plate shown has the following:

r_m = 0.10  m              , m = 0.3

If this plate will fit with a double-plate clutch

with multi springs. The total friction force (F_f)

is 1200 N. Find:

a- the normal force (f_n).

b- the clutch torque (T_c)

c- the design factor (f_d) if the engine torque is 100 N.m

15- (A) The following data of a four stroke engine is known as:

Engine swept volume (V_e), number of cylinders (n), compression ratio (r)

indicated power (P_i), engine rpm (N), engine brake power (P_b),

- Write down the following quantities using the above symbols:

* The cylinder clearance volume (V_C)

* The engine mechanical efficiency (h _m)

*The indicated mean effective pressure (imep)

B) What is the job of diaphragm spring in the friction clutch?

C) What are the friction surfaces of the surfaces of the friction clutch?