As you want to download Objective Solved Question Papers of ECE Branch for IES Exam conducted by UPSC, so here I am providing following paper:

UPSC IES Exam Objective Solved Question Papers for ECE Branch
(a) With the help of r-k diagram explain the difference between direct and indirect bandgap
semiconductors. Identify the following semiconductors in the above categories
(i) Si
(ii) Ge
(iii) GaAs
(iv) GaP
(v) InSb

(b) ( i) Draw the structure of Schottky-barrier photodiode.
(ii) Draw the geometrical structure of an Avalanche Photodiode and its electrical field profle.
(iii) Draw the V-1 characteristics of GaAs and explain the significance of negative resistance.

(c) Two independent signals x 1 (.t) and xz(t) are periodic with a period Tc,• Show that the
product of the two periodic signals is also periodic with the same time period T0

(d) A student, while measuring the frequency of a waveform from a square wave generator, set the trigger input of a CRO in "LINE" mode. He adjusted the input frequency to 396 Hz to
get a stable display on the screen. What is the actual frequency of the mains supply ?

2. (a) State Law.
A copper disk with a diameter of 2 em and thickness of 25 mm has a resistivity of 70 n n m. The disk conducts heat from an electronic device to a heat sink at a rate of 10 W. Estimate the value of the temperature drop across the disk neglecting heat losses from the surface.

(b) ( i) What is a soft magnetic material ? Give examples of soft magnetic materials and
list their applications

(ii) With the help of magnetization characteristics (M vs. B curves) explain the
difference between Type I and Type II superconductors.

(d) (i) What is Kerr effect? How does it differ . from Pockels effect ?

(ii) What is Fresnel reflection loss ? Light falls on a GaAs substrate at 850 nm from air. Calculate the Fresnel reflection loss at the air-GaAs interface for normal incidence.

UPSC IES Exam Objective Solved Question Papers for ECE Branch

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