Types of GearTrains

GearTrain Definition -

Geartrain can be defined as the combination of gears used to transmit motion from one gear to another.
A geartrain may consist of three parts :

1. Driving Gear
2. Driven Gear
3. Idlers

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Geartrain Define with its contents

 Geartrain can be defined as the combination of gears combined in such a way that they transmit motion from one gear to other.

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Injection molding and injection molding machines

 Making polymers is a fantastic science, as well as shaping plastic objects.
One of the most common methods of shaping plastic resins is a process called injection molding. Injection molding is accomplished by large machines called injection molding machines, which are classified mainly by the type of system that drives them: Hydraulic, electric, or hybrid.

Hydraulic injection machines uses ram system for its clamping mechanism. This type of machine is used by majority of molding companies.

Electric injection machines are driven by motors. Unlike the hydraulic machines, which continuously pump hydraulics to the cylinder throughout the whole molding cycle, an electric machine only makes use of energy during closing and opening of the clamping unit. It uses toggle system for its clamping mechanism in order to build up tonnage. It is also faster, quieter, and has higher accuracy, but it is also known to be more expensive.
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Special Casting Processes

Special Casting Processes:

The sand moulds may be used for casting ferrous and non-ferrous metals, but these moulds can be used only once, because the mould is destroyed after the metal has solidified. This will increase the cost of production. The sand moulds also, can not maintain the tolerance and smooth surface finish. In order to meet these requirements, following casting method may be use:

1: Permanent Mould Casting

A casting made by pouring molten metal by gravity into a mould made of some metallic alloy or other material of permanence is known as permanent mould casting.

2: Slush Casting

The slush casting is a special application involving the used of  permanent mould. It is used for casting low melting temperature alloys. This method is only adopted for ornaments and toys of non-ferrous alloys.

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“Pattern”- making, allowances and its types:

Pattern:

Pattern can be simply said as the replica of cast.A pattern may be defined as a model of desired casting which when moulded in sand forms an impression called mould. The mould when filled with the molten metal forms casting after solidification of the poured metal. The quality and accuracy of casting depends upon the pattern making. The pattern may be made of wood, metal(cast iron, brass, aluminium and alloy steel.), plaster, plastics and wax.

Pattern Allowances:

A pattern is always made larger than the required size of the casting considering the various allowances. These are the allowances which are usually provided in a pattern.

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Engineering Word Game aka Antaakshari

This is a word building game, words related to engineering only are to be typed in here.

How to Play.
Start game with any Word/Alphabet.
Look for the end alphabet in word if starting game with a word. Suppose its "D".
Then player 2 would make another word starting with letter D. For eg - Displacement

So lets Start with "L"

PS: ONLY TYPE THE WORD IN THE COMMENTS.

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Textually Active? TXT Could Be Dangerous...Practice Safe TXT!

TEXTING or SMSing as it is popularly known, has become the latest fad. As more and more youngsters resort to text messaging over voice calls, emails and other available modes of conversation, concerns are being raised over the health hazards posed by the excessive use of mobile phones for sending/ receiving SMSs.

Delhi Most Notorious!

According to a study conducted by the Associated Chambers of Commerce and Industry of India ( ASSOCHAM), Delhi tops the list of cities in text messaging, with youngsters spending a whopping INR 1,000- 1,500 every month on SMS packages. Interestingly, more girls ( 55 per cent) in the Capital were found addicted to texting.

The survey assessed the responses of youth aged between 12- 20 in Delhi, Mumbai, Chandigarh, Lucknow, Ahmedabad, Patna, Kolkata, Chennai, Bengaluru and Jaipur. The sample group, having an equal number of males and females, consisted of about 200 youngsters. The findings of the survey are quite disconcerting, if not outright alarming.

“ Excessive texting is responsible for a number of health related problems in the youngsters such as insomnia, depression, loss of appetite, isolation etc,” secretary general of ASSOCHAM D. S. Rawat said.

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Engineering definition as per an engineer

"ENGINEERING" has been chosen as the TOUGHEST course among all d courses including BCOM, Bca, IAS, IPS n MBBS; by d Guinnes Book of World Recrds, on 18Aug2010.
It hs 58 univrsty xams + 130 seris xams + 174 asignmnts wthn 4 years (max 750 wrkng dys).

All engineers should know this atleast & b proud to be an engineer!


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MDU

MDU (MahaRishi Dayanand University)

MAHARSHI DAYANAND

Maharshi Swami Dayanand Saraswati
[1824 – 1883]

 

Maharshi Dayanand Saraswati, before becoming a sanyasi, bore the name of Moolshankar. He was born on Sept. 02, 1824 at Tankara in the then Morvi state in Kathiyawar region of Gujarat. His father Karshanji Lalji Tiwari was an orthodox Brahmin, and a devout worshiper of Lord Shiva. Moolshankar’s Sanskrit education began at the age of five. He was invested with the sacred thread in his eighth year. By the time he was fourteen, he had committed to his memory the whole of the Yajurveda and several portions of other Vedas. Once, on a Shivaratri day, when Moolshankar was only in his fourteenth year, his father commanded him to participate in the night-long vigil in the temple of Lord Shiva. His father and other devotees soon fell asleep. Young Moolshankar, now and then, bathed his eyes with cold water to resist sleep. Then, suddenly, gripped his mind a hideous doubt as to whether the stone image of Shiva before him, bestriding a bull with a trident in one hand and a drum in the other, and allowing live rats to crawl over His body, could indeed be the Lord of Kailash, the Supreme being. He roused his father from sleep and asked him to clear his doubts. His father, in the usual manner, explained, “Shiva can not be perceived directly in this Kali Age, and hence people have to consecrate the idol representing the God by reciting Vedic mantras for the purpose of worship”. The boy was not satisfied with such an explanation and went home. He put an end to his vigil and broke his fast, as he had made up his mind to break away once and for all from idol worship.

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Arc Welding and its types.

Arc Welding:
The arc welding is a fusion welding process in which the welding heat is obtained from an electric arc struck between the work(or base metal) and an electrode. The temperature of the heat produced by the electric arc is of the order of 6000°C to 7000°C. Both the direct current (D.C) and alternating current(A.C) may be used for arc welding, but the direct current is preferred for most purposes. When the work is connected to the positive terminal of the D.C welding machine and the negative terminal to an electrode holder, the welding set up is said to have straight polarity. On the other hand, when work is connected to negative and the electrode to a positive terminal, then the welding set up is said to have reversed polarity. The straight polarity is preferable for some welds while for other welds reversed polarity should be used.
Following are the two types of arc welding depending upon the type of electrode:
(A): Un shielded arc welding:
When a large electrode or filler rod is used for welding, it is said to be un- shielded arc welding.
(B): Shielded arc welding:
When the welding rods coated with fluxing material are used, then it is called shielded arc welding.

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Electrical Resistance Welding

 Electric Resistance Welding
It is a type of pressure welding. It is used for joining pieces of sheet metal or wire. The welding heat is obtained at the location of the desired weld by the electrical resistance through the metal pieces to a relatively short duration, low voltage, high ampere electric current. The amount of current can be regulated by changing the primary turns of the transformer. When the area to be welded is sufficiently heated, the pressure varying from 25MPa to 55MPa is applied to the joining area by suitable electrodes until the weld is solid. The various types of electric resistance welding are as follows:

(1) Spot welding
It is used for welding lap joints, joining components made from plate material having 0.025 to 1.25 mm in thickness. The plate to be joined together are places between the two electrode tips of copper or copper alloy.

(2) Roll spot and seam welding
When the spot welds on two over lapping pieces of metal are spaced, the process of welding is known as roll spot welding. If the spot welds are sufficiently made close, then the process is called seam welding. This process is best for metal thickness ranging from 0.0.25 to 3 mm.

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Measuring Utility - Ways to measure Utility

Defining the term Utility was a very difficult work to do. But with the passage of time and involvement of many professionals in it. Finally the definition was found due to all of them.

Most important were Chapman and Prof. Boulding.

But now it was the time to found out a way to measure it. It was really a difficult task as consumers have different wants and their wants vary with respect to their abilities. Even now there is no exact way to find it out. But due to some considerations and Facts applied. Two ways are found to measure it.

• As per the Money -
  Needs have to be satisfied as per the Money. For example - if a consumer have certain amount of money then he/she had to manage her needs and to fulfill them within that certain amount of money.
• As per the Time -
  Want satisfying quality of a good or service always changes with time. As firstly a commodity is liked much by us, but with continuous supply our needs starts to get less fulfilled by that. Exeptions - alcoholic people = Drunkards need more and more alcohol with the continuous supply.

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Types of Utility with Proper Explanations

Utility is basically classified in two parts:

• Total Utility
• Marginal Utility

But we also consider third utility for our own simplifications.
Initial Utility.

So now we shall describe all of these below.

Initial Utility -
It is the utility which is consumed from the first unit consumed by the consumer. It is always positive. For example - A consumer consumes first unit of commodity, from that he gets 10 utility. That is considered as initial utility. SO in above case initial utility is 10.

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Utility - Economics Term - Best Explanation

Utility - Quality of a good or a service that satisfies our wants.

According to Chapman:
Utility is the want satisfying power of a commodity.

For example - Eating first slice of bread would provide 14 utility, but as we eat second slice utility gained decreases to 10. So the total utility consumed from the Bread is 14+10=24. Utility in simple terms as per in bread example can be termed as Hunger of consumer.
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