Stronger than steel and a fraction of the weight, carbon fiber is a brilliant invention. Since its first use as a motor case on space rockets in the 1960s, it's often proclaimed as the ticket to better performance. It costs enough that it better. Despite 50 years of advancements carbon fibre remains expensively high end. But 50 years later, carbon fiber is still rare and expensive (starting at $10/pound.The rate of steel is $0.38/pound.)

Turbochargers are rarely used with petrol engines but mostly used in diesel engines. We will discuss the reason behind this in this article.

On 16 April, 1853, Indian Railways started its services and the first train travelled at a distance of 33 km from Mumbai to Thane. While travelling through train, you may have seen coloured coaches and different coloured stripes on the train coaches such as yellow or white etc. Have you ever thought why these coloured stripes are given to some of the train coaches, what does it mean? Let us study through this article about the stripes and about the colour coaches & their significance.

You have probably noticed the lines on the rear windshield of your vehicle.Have you ever wondered what those thin lines running across the length of your rear window are for? We will discuss about these lines in this post.



 

ABS which simply means Anti-Locking Braking System prevents the rear or the front wheel or both in some case from locking up which if fails, ends in a disaster.

 

1) What do you mean by Smelting ?
 
Process of extraction of iron is called Smelting.

2) What do you understand by Specific Gravity and Tenacity ?

Specific Gravity . It is the ratio of the mass of 1cubic cm. of a substance to the mass of the same capacity of water.

• Tenacity .It is the property of metal due to which a metal becomes strong enough to resist the pulling force.

3) Define the following metal properties (a) Machinability (b)Malleability

Choke valve in bikes :-

A choke valve is sometimes installed in the carburetor of internal combustion engines. Its purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine. Depending on engine design and application, the valve can be activated manually by the operator of the engine (via a lever or pull handle) or automatically by a temperature-sensitive mechanism called an autochoke.

Electric irons and certain other kinds of heating appliances have a high risk of the power cord being exposed to very high temperatures, by direct contact with the heating element. Plastic or rubber materials work great as electrical insulators, but many of them acts very poorly and fail in undesirable ways when exposed to high temperatures.

In order to prevent this kind of hazardous failure, the cord is sheathed with a material that has:

NOS or nitrous oxide - a familiar name among drag racers and those who are crazy about speed and power. This gas also called as laughing gas, was once used as an anesthetic for minor surgeries, yet now being widely used in automobiles and other propulsion systems. Many would have seen NOS system in action while racing in  the movie- fast and furious. Due to its superb property as an oxidizer, this gas is used in boosting up the performance of bikes and cars. Along with instant acceleration it also increases the horsepower of  engines.

1.Why Entropy decreases with increase in temperature?

 Ans: ds=dQ/T. Entropy is inversely proportional to the temperature so, as temp. Increases, entropy decreases.