Ignore the tickmarks in the options
Correct answer will be posted tomorrow.

The answer to this poll is



1 BCC-BCC has 48 slip systems
while FCC has 12 slip systems.

The answer to this poll is



2 FCC-Though slip systems are more in BCC it should be more ductile because to be ductile there should be more than 5 independent slip systems. But more number of slip systems in BCC causes self interferrence hence it behaves like Brittle.

The answer to this poll is


Increases- the angle is from horizontal and is inversely proportional to Sine of angle.

The answer to this poll is




2 Heat Rejection- Because heat generation is always positive generally caused by friction so, to be isentropic, the process must be heat rejection process such that Q/T equals to heat generation.

One Hint— As rake angle increases tool gets thinner, but do also think about Force.
Now try to answer.

Gate 2020 response sheet is out officially.

#Interview #concept

Take assumption oxygen is present. (To burn O2 is a must)

In Metal cutting
If higher value of Shear angle is given then it means the cutting force will be automatically lower and the shear plane will be smaller, inturn less power is required, so it will produce less heat i. e easier machining.


#Funda #Production

In general in any term where specific is used with for example - Specific weight(Weight/Volume),
So Specific power can be interpretated as Power consemed per unit volume.
So its unit will be J/mm^3.

Even if cutting velocity is unkown we will be able to find out SEC by Fc/(1000*f*d)

1000 was multiplied to convert Velocity from m/s to mm/s.