POWER STEERING

POWER STEERING:

Power steering assists the driver of an automobile in steering by directing a portion of the vehicle’s power to traverse the axis of one or more of the road wheels. As vehicles have become heavier and switched to front wheel drive, particularly using negative offset geometry, along with increases in tire width and diameter, the effort needed to turn the steering wheel manually has increased often to the point where major physical exertion is required. To alleviate this, auto makers have developed power steering systems: or more correctly power-assisted steering on road going vehicles there has to be a mechanical linkage as a fail safe. There are two types of power steering systems hydraulic and electric/electronic.

What is DTSI Technology & DTS-Si Technology ?

What is DTSI Technology & DTS-Si Technology ?

In DTSi, instead of 1 we are using 2 spark plugs. Flame front formed is able to consume more air-fuel mixture as compared with 1 spark plug, thus more complete burning and more efficiency.

In DTS-Si, with addition of 2nd spark plug, what they are doing is relocating valves position. With proper designing of inlet and outlet valves you can induce extra swirl for inoming air fuel mixture. Due to turbulence, extra efforts are provided for proper mixing of air and fuel. (We can not allow petrol to go in liquid droplet form, it should be finely atomized). With well atomized air fuel mixture, efficiency increases.

Slider Crank and Slotted Lever Quick return motion mechanism

Slider Crank and Slotted Lever Quick return motion mechanism

 

 

What is the difference between nozzle and diffuser?

What is the difference between nozzle and diffuser?

A nozzle is a device that increases the velocity of a fluid at the expense of pressure.
A diffuser is a device that increases the pressure of a fluid by slowing it down.

Degree of Freedom

Degree of Freedom :-

The degree of freedom can be defined as the minimum number of independent coordinates which can specify the position of the system completely.
There are total 6 degree of freedom.
Among them 3 are Transnational, 3 are rotational.
The degree of freedom of a body decreases by applying constrains for the body.

Injection molding

Injection molding :-

Injection molding is a manufacturing process for producing parts by injecting material into a mold. Injection molding can be performed with a host of materials, including metals, glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers.

Material for the part is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the cavity.

Injection molding is used to create many things such as wire spools, packaging, bottle caps, automotive dashboards, pocket combs, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products available today. Injection molding is the most common modern method of part manufacturing; it is ideal for producing high volumes of the same object.

Thermoelectrically operated fan using a candle

Thermoelectrically operated fan using a candle.

( Operate a fan with the candle during power cuts/ villages where there is no power!!)

Innovation at its best.

W engines - what does the W stand for?

W engines - what does the W stand for?
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With the aim of building even more compact units with a large number of cylinders, the design features of the V and VR engines were combined to produce the W engines.
As with the V engines, the cylinders are distributed to two banks. In the W8 and W12 engines, these banks of cylinders are aligned at a V-angle of 72° in relation to one another. As in the VR engine, the cylinders within each bank maintain an angle of 15°.

When the W engine is viewed from the front, the cylinder arrangement looks like a double-V. Put the two Vs of the right and left cylinder banks together, and you get a W. This is how the name "W engine" came about.

Honing

Honing :
Honing is an abrasive machining process that produces a precision surface on a metal workpiece by scrubbing an abrasive stone against it along a controlled path. Honing is primarily used to improve the geometric form of a surface, but may also improve the surface texture.
Typical applications are the finishing of cylinders for internal combustion engines, air bearing spindles and gears. There are many types of hones but all consist of one or more abrasive stones that are held under pressure against the surface they are working on.
In terms of sharpening knives, a honing steel does not actually hone knives, but simply realigns the metal along the edge.

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS:-

1.). What is anisotropy ?

Ans: The phenomenon of different properties in different directions is called anisotropy.

2.)What is vapour pressure and when it becomes important ?

Ans: Vapour pressure is the partial pressure created by the vapour molecules when evaporation takes place within an enclosed space. It becomes important when negative
pressures are involved.

3.)Explain absolute viscosity ?

Ans: It is the ratio of shear stress and the gradient of velocity with distance between a fixed plate and moving plate (Its unit is Pa . s).

4.)What do you understand by acoustic velocity ?

Ans: Acoustic velocity is the speed of a small pressure (sound) wave in a fluid.