Autotronics Services

تقدم نقابة المهندسين الأردنيين العديد من الخدمات لمنتسبيها
و تهتم أيضا بتعزيز هذه الخدمات ل

كونوا بالقرب للمزيد من التفاصيل عن الخدمات النقابية للمهندسين الشباب :)

How to read tire side wall

كل المهندسين المتخرجؤن حديثا او طلاب سنة خامسة كونو موجودين رح يساعدكم البرنامج التأهيلي اتحضير أنفسكم لسوق العمل و معرفة حقوقكم

البرنامج التأهيلي (هندس مهنتك)
للمهندسين الشباب وطلاب الهندسة - السنة الخامسة
رابط التسجيل : https://goo.gl/yi6AIs

دورة للمهندسين الشباب في الشعبة الميكانيكية
رابط التسجيل : https://goo.gl/a9MDGk
شباب بنصحكم تسجلو فيها كتييير مفيدة

Tires

The tires are crucial functional elements for the transmission of longitudinal, lateral and vertical forces
between the vehicle and road. The tire properties should be as constant as possible and hence predictable by the driver.

As tires significantly affect the handling properties of vehicles, the properties of original tires – the tires
with which the vehicle is supplied to the customer –are specified by the vehicle manufacturers in conjunction
with the tire manufacturers. However, spare tires usually differ from the original tires, despite their similar designation; hence handling characteristics can change. Individual vehicle manufacturers have therefore
decided to identify tires produced in accordance with their specifications by means of a symbol on the sidewall
of the tire or to sell tires which meet the specifications of original tires at their manufacturing branches.

Interchangeability
All tires and rims are standardized to guarantee interchangeability, i.e. to guarantee the possibility of using
tires from different manufacturers but with the same designation on one vehicle and to restrict the variety of
tire types worldwide.
Within Europe, standardization is carried out by the European Tire and Rim Technical Organization or
ETRTO, which specifies the following:
_ tire and rim dimensions;
_ the code for tire type and size;
_ the load index and speed symbol.

Passenger car tires are governed by UNO regulation ECE-R 30, commercial vehicles by R 54, spare wheels by
R 64, and type approval of tires on the vehicle by EC directive 92/23/EC.

In the USA the Department of Transportation (or DOT) is responsible for the safety standards. The standards relevant here are:
The Tire and Rim Association, or TRA for short, is responsible for standardization.

In Australia, binding information is published by the Federal Office of Road Safety, Australian Motor Vehicle
Certification Board is the applicable standard.

In Germany, the DIN Standards(Deutsches Institut fu¨r Normung) and the WdK Guidelines (Wirtschaftsverband
der Deutschen Kautschukindustrie Postfach 900360, D-60443, Frankfurt am Main) are responsible for specifying
tire data.

All bodies recognize the publications of these two organizations. At the international level, the International Organization for Standardization (ISO) also works in the field of tire standardization and ISO Standards are translated into many languages.

Motor Oil Viscosity Grades
Viscosity is oil resistance to flow.
Thicker oil ; higher viscosity ; slower flow
Thinner oil ; lower viscosity ;higher flow

“W” on a viscosity rating it means that this oil viscosity has been tested at colder temperature, the number without “W” oil viscosity has been tested at 210 °F (100 °C) which is considered an approximation of engine operating temperature.

SAE 30 is same viscosity as 10-W30/5W30 at 210°F (100 °C), but difference is when viscosity tested at colder temperature.

Depending on the oil performance at cold temperature the motor oil viscosity grade will be given, If the motor passes through cold temperature or “W” specification for a SAE (15W) and at 210 °F (100 °C) flow through a viscometer like SAE 40 motor oil, then the label will read 15W-40.

5W-30 motor will performs like a SAE 5 motor oil would perform at the cold temperature specified, but still has SAE 30 viscosity.
The advantages of low “W” viscosity number; quicker the oil flows cold; less dry running; means less engine wear. The motor oil need to be thin at cold “startup” conditions. The lower viscosity; the more wear will inevitably occur.

Addition of pour point depressant additives (VI) keeps the paraffin in petroleum base oils from coalescing together when temperature drops.

Pour point depressant additives “VI” keeps the oil from being thinner at hot condition and from coalescing at cold temperature.

Electrical and electronic system in an automobie (Final Exam)
1. True or fales:
a. When the engine strats, an overrunning clutch prevents the engine flywheel from spinning the armature o the motor.
b. When the engine starts the flywheel spins the pinion faster than the armature.
c. The starting safety switch often called the neutral safety siitch is normally OPEN switch that prevents the strarting system from operating when the tramnsmission is in gear.
d. The period of during which there is primary current flow is often called DWELL.
e. The heart of the fuel injection system is compter or powertrain control module.
2.Mention starting system circuit and explain thier operating principle.
3. Heat Range for spark plugs with drawing.
4. parts of spark plug with explaination.
5. Adantage off distributorlessignition system.mention 10 points
6. Central multiport fuel injection system (CMFI) (All parts with explain ation of its work for each)
إخواني بتمنى تستفيدو من الأسئلة وراجعوا أسئلة السكند الي نزلتها على الصفحة ممكن تنعاد أسئلة أو يجي منها أسئلة و بالنسبة للصح و الخطأ الي نزلتهم الجزء الي متذكرو بس أغلبهم أجو موزعين من المادة الي بقرأ المادة منيح بحلهم و الدكتور بس بغير كلمة من الجملة عشان تتحول من صح لخطأ و اجت أسئلة املأ الفراغ مش متذكرهم بس أغلبهم من نظام الاشعال و الحقن.
وااله يوفقكم