IES Study Material For ECE

For see paper pattern of IES ECE exam can anyone provide me its old question paper?

[Quick Sam]

You want old question paper of IES ECE exam so here I am giving you the same:

Values of the following constants may be used wherever necessary.
Electronic charge = – 1.6  10–19 Coulomb.
Free space permeability = 4   10–7 Henry/m.
Free space permittivity = (1/36 )  10–9 Farad/m;
Velocity of light in free space = 3  108 m/sec.
Boltzmann constant = 1.38  10–23 Joule/K.
Planck’s constant = 6.626  10–34 Joule.sec.

Derive the equation of a cylindrical capacitor in terms of the radii of core sheet and length. In the circuit given in the above figure find the potential difference between A and C and B and C, under steady state conditions. 15
(b) In intrinsic Ga As, the electron and hole mobilities are 0.85 and 0.04 m2/V-S respectively and corresponding effective masses are 0.068 mo and 0.5 mo respectively, where mo is the rest mass of an electron. If the energy gap of Ga As at 3000 K is 1.43 eV, calculate the intrinsic carrier concentration and conductivity. mo 9.11  10–28 gm. 15
(c) Derive the Clausius-Mossotti relation between atomic polarisability & dielectric constant for a dielectric material. 10
2. (a) Sketch the variation of the density of states function, Fermi Dirac probability distribution function and electron and hole concentration for n-type silicon where Nd = 1017/c.c. and Na = 1016/c.c. Write down the condition for charge neutrality in a compensated semiconductor at T = 300° K.

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