Tuesday 24 April 2018

TOP FIVE RECENT DEVELOPMENT IN MECHANICAL ENGINEERING !!

1.)First turbine-powered street legal motorcycle -MTT Y2K SUPERBIKE

It’s the Most powerful production bike in the world which runs on diesel with kerosene. It has Rolls Royce-Allison gas turbine engine which produces 420 HP with 678 NM torque. 2-speed automatic transmission transfers excellent power, the top speed is more than 440 kph, weighs 230 kg. The design is great and fabricated from solid billets. It obtained Guinness World Record as the most expensive production motorcycle.

2.)Car engine - most powerful up to now 

The Devel Sixteen V16 Hyper-car - The custom made the real most powerful engine in the world is Devel Sixteen V16 Hyper-car which has 5000-hp, Quad-Turbo, 12.3-Liter V16. this is craziest power ever which has red-line of 8000 - hp. It is first revealed in Dubai Motor show, it reaches PS 0-60 in 1.8 seconds, and a top speed nearing 350 mph.


3.)Toyota launches first mass-market fuel cell car - Mirai, which converts hydrogen into electricity and emits nothing but water drops. It’s going to be the breakthrough in future for other vehicles like Forklifts, trucks, buses.




4.)Self driving Car

Google’s self driving car is almost driver less(manual assist needs in some dangerous turns) with start and stop option and which uses chauffeur system. The LIDAR(combined SONAR and RADAR) technology with Google map works in a precision manner. It uses 64 typical laser beams to find the objects around the car (360 degree). Cost of this system is around US $ 1 lakh. Accuracy, precision is more in this system which enables pre safe. Top speed is 40 kph.

5.)3D printing Technology

3D- printed steam turbine turbo-machinery used to convert Seawater into drinking water which was developed by GE.
Miniaturized Turbine used to compress and stream a mixture of air, salt and water through a hyper-cooling loop that freezes seawater. By freezing the mixture, the salt naturally separates in solid form, leaving just the ice. The ice is then melted, leaving clean water.

MULTIPLE CHOICE QUESTIONS ON ENGINE LUBRICATION SYSTEM !!

1-Lubricating oil
(A) Minimizes wear in moving parts
(B) Helps in keeping the parts cool
(C) Washes away and carries away dirt
(D) All of the above
(Ans: D)
2-Viscosity index (VI) is a measure for the change of viscosity with change in
(A) Temperature
(B) Pressure
(C) Volume
(D) All of the above
(Ans: A)
3-The following type of Lubrication system is used in two stroke engines
(A) Petroil (mist) system
(B) Wet sump system
(C) Dry sump system
(D) All of the above
(Ans: D)
4-In the following system, lubricating oil is carried in separate tanks from where it is fed to the engine
(A) Mist lubrication system
(B) Wet sump system
(C) Dry sump system
(D) Splash system
(Ans: C)
5-The following type of Lubrication system is used in Aircraft Engines
(A) Mist lubrication system
(B) Wet sump system
(C) Dry sump system
(D) Splash system
(Ans: C)
6-The following type(s) of Oil pump(s) is (are) used in Engine Lubrication system
(A) Gear type
(B) Rotor type
(C) Plunger type
(D) All of the above
(Ans: D)
7-The following is (are) oil pressure gauge(s)
(A) Pressure expansion type
(B) Electric type
(C) both (A) and (B)
(D) None of the above
(Ans: C)
8-The purpose of crankcase ventilation is to
(A) remove harmful particles from the engine
(B) provide proper lubrication to the engine
(C) provide air for combustion to the engine
(D) all of the above
(Ans: A)
9-The following part(s) is(are) lubricated by splash system
(A) Piston and piston rings
(B) Tappets
(C) Cams on camshaft
(D) All of the above
(Ans: D)
10-The following part is not lubricated by Pressure feed system
(A) Timing gears
(B) Valve rods and Push rods
(C) Rocker arms
(D)  Main bearings of crankshaft
(Ans: B)

INTERVIEW QUESTIONS OF PRODUCTION TECHNOLOGY !!

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
(a) Machinability is the property of metal due to which a metal can easily be cut by cutting tools to obtain good surface finish. E.g.: Brass, Mild steel
  • (b) Malleability is the property of the metal on account of which it can be extended in all directions by hammering or rolling. E.g.: Tin, Lead

4) Define Hardness of the metal ?
It is the property of the metal which makes a metal capable to resist surface penetration by other metals .Hard metals are High carbon steel and High speed steel.
5) What is the Toughness of metal ?
Toughness is the property of metal due to which without fracture a metal is able to withstand bending or torsion. Mild steel and wrought iron are tough metals.

6) Define the following properties of metal : (a) Fusibility (b) Stiffness (c) Ductility
Fusibility. It is the property of metal due to which a metal becomes fluid when it is heated.
Stiffness. It is the property of metal due to which a metal is capable of resisting deflection due to an externally applied load.
Ductility. It is the property of metal due to which a metal can be drawn into the form of wires without rupture.
7) Why are cast iron seasoned before machining ?
For easy machining and saving the cutting edge of the tool.
8) How does carbon affects the properties of steel ?
If carbon content is higher the degree of hardness is more and the melting point is lower, If carbon percentage is lower it is easy to forging and forge welding.
9) Why are machine beds made of cast iron ?
Because it has more compressive strength and negligible shrinkage. It can easily cast into any integral shape, wear resisting and can absorb vibrations.
10) What is the difference between Wrought iron, Cast iron and Pig iron ?
Wrought iron contains less than 0.1% carbon and this is a product of puddling furnace. Cast iron is produced from cupola furnace. It contains 3­3.5% carbon in combined or free state. Pig iron is an iron carbon alloy contains 3­5% carbon along with impurities like manganese, sulphur and phosphorous. It is a product of blast furnace.