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.

TIPS TO REMEMBER THERMODYNAMIC PROCESSES EXPLAINED !!

In thermodynamics you might get confused with various thermodynamic processes like isobaric, isochoric, isothermal, isetropic. This video explains various tricks to remember the meaning of various thermodynamic processes.

FOUR WHEEL DRIVE VS ALL WHEEL DRIVE EXPLAINED !!

The 4WD and AWD are pretty much same, but have some variations each works best under certain conditions.

Four Wheel Drive:

• It’s the oldest one, which has two options in terms of how and when torque is supplied to each wheel called Full time 4WD and Half time 4WD. Power from the engine goes to transfer case, which splits the power between the front and rear axles so that torque is evenly applied to each wheel
• Its axles doesn’t rotate at the same speed, the option is available to choose what we need whether the torque needed for 2 wheels or 4 wheels.
• It’s good for Off road vehicles, Pickup trucks, terrain running vehicles where torque plays major role.
• It has locking differential option which gives more traction power to the wheels in off roads.
• This rugged technology has an option to turn off the drive to improve fuel economy.
• It might be dangerous once back on Tarmac from off road.
• Used in Jeeps, Landrovers, Pickup trucks.

All wheel drive:

• AWD is a car system while 4WD is a truck system, the recent innovation which is AWD drive system is on all the time used in all the cars like Audi, Nissan GTR, Mercedes-Benz E63 AMG .These are all good examples for AWD.
• ECU(Electronic control Unit) Plays a major role in the AWD system sensors on each wheel monitor traction, wheel speed, and several other data points and decide to send the power to which wheel depends to maximise the grip and driveability.
• This best AWD sends the power to each wheel using a front rear torque - split system cutting the power from the wheel to the least traction. Most of the time rear wheels have the power to move the vehicle forward and from front wheels moves freely to improve fuel economy.
• The latest technology in AWD use variable torque distribution system.
• Provides increased grip and control under all road condition, gives sportier handling and traction to a broader range of cars. Good in snowy roads, performance oriented cars.
• Not good for off road and fuel economy is less.

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