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Old June 16th, 2014, 04:54 PM
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Default IETE AMIETE (Old Scheme) Materials and Processes previous years question papers

Can you please give me the IETE AMIETE (Old Scheme) Materials and Processes previous years question papers?
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Old June 17th, 2014, 11:33 AM
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Default Re: IETE AMIETE (Old Scheme) Materials and Processes previous years question papers

As you want to get the IETE AMIETE (Old Scheme) Materials and Processes previous years question papers so here is the information of the same for you:

Q.1 Choose the correct or the best alternative in the following: (2 × 10)
a. The coordination number of Simple Cubic and HCP unit cells is
(A) 12, 12. (B) 6, 12.
(C) 8, 12. (D) 12, 8.

b. Which of the following elements is a covalently bonded crystal?
(A) Aluminium (B) sodium chloride
(C) Germanium (D) lead

c. Miller indices of the diagonal plane of a cube are
(A) (220). (B) (110).
(C) (010). (D) (101).

d. The residual stress and incomplete penetration in welding can be reduced by
(A) Preheating the parts to be welded and quickly cooling the welded
structure
(B) Preheating the parts to be welded and slowly cooling the welded
structure
(C) Slowly cooling the welded structure only
(D) Quickly cooling the welded structure only
e. P-type and N-type extrinsic semiconductors are formed by adding impurities
of valency
(A) 5 and 3 respectively. (B) 5 and 4 respectively.
(C) 3 and 5 respectively. (D) 3 and 4 respectively.

f. The property of a material by which it can be drawn into wires is known as
(A) Softness (B) malleability
(C) Ductility (D) tempering

g. A ferromagnetic material is one in which neighbouring atomic magnetic
moments are
(A) antiparallel and unequal.
(B) predominantly parallel.
(C) all randomly oriented.
(D) predominantly parallel in a small region of material.

h. Which of the relation gives the diffusion constant n D for electron if is the
mobility for electron, T is the temperature and B K is Boltzmann’s constant
(A)
e
T K 2
Dn n B 
(B)
T e
K 2
Dn n B



(C)
n
B
e
T K 2
Dn


(D)
e
T K
Dn n B 

i. Steel can be hardened by which of the following process
(A) Normalizing (B) Annealing
(C) Quenching (D) All of the above
j. The dielectric strength is highest in
(A) PVC. (B) Polyethylene.
(C) Mica. (D) Transformer oil.

Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. A metal having a cubic structure has a density of 1.892 gm/cm3, an atomic
weight of 132.91 gm/mol, and a lattice parameter of 6.13
o
A . One atom is
associated with each lattice point. Determine the crystal structure of the
metal. (8)

b. Does the Burger’s vector change with the size of the Burgers circuit?
Explain. (8)

Q.3 a. The density of a sample of HCP beryllium is 1.844 gm/cm3 and the lattice
parameters are o a = 0.22858 nm and o C = 0.35842 nm. Calculate
(i) the fraction of the lattice points that contain vacancies
(ii) the total number of vacancies in a cubic centimetre. (8)

b. What is tie-line rule? Explain. Show that, for correct mass balance, the
relative amount of two co-existing phases or micro constituents must be as
given by the lever rule. (8)

Q.4 a. What are the characteristics of a semiconducting material? Discuss the
properties of Silicon and germanium, as well as their uses. (8)

b. How the mobility of carrier current is related to Hall coefficient? Is the
mobility of an electron in the conduction band of a semiconductor the same
as the mobility of a hole in the valence band? (8)

Q.5 a. Show that the electrical conductivity in metals is proportional to the
density of free electrons and to the electron mobility.
(8)

b. What are Manganin and Nichrome? Give their composition, properties
and uses. (8)

Q.6 a. Explain the electric polarization, the electric susceptibility, dielectric loss
and loss angle in the context of dielectrics. (8)

b. Give the properties and classification of ferrites. Differentiate magnetically
soft ferrites and magnetically hard ferrites. (8)

Q.7 a. How the magnetic behavior of magnetic materials are classified. List their
properties to distinguish them from each other. (8)

b. A magnetic material has a coercive field of 167 A/m, a saturation
magnetization of 0.616 Tesla, and a residual inductance of 0.3 tesla. Sketch
the hysteresis loop for the material. (8)

Q.8 a. Discuss atomic model of diffusion. What is Einstein’s relationship? (8)

b. Differentiate between chemical vapour deposition and lithography (8)

Q.9 Write short notes on any TWO: (8+8)
(i) Cold and Hot working processes
(ii) Welding, soldering, and brazing processes
(iii) Full Annealing and Normalizing
(iv) Hardening and tempering.

Q.1 Choose the correct or best alternative in the following: (2 × 10)
a. Covalent bonds in solids are formed by
(A) Electrical dipoles. (B) Sharing of electrons.
(C) Transfer of electrons. (D) Gravitational forces.

b. A plane in a unit cell is described by its Miller indices (632). The plane
intersects x, y, z respectively at points whose distances from origin are
(A) 6, 3 and 2 units (B) 1/3, 2/3 and 1 units
(C) 1/3, 1/2 and 1/1 units (D) 1/6, 1/3 and 1/2 units

c. The unit of diffusion coefficient is
(A) m2 s1. (B) m2 s–1
(C) m2 s–2 (D) m2 s2

d. In a single component system, the maximum number of phases that can
coexist in equilibrium are
(A) 5 (B) 7
(C) 3 (D) 2

e. If the mobility of electrons in a metal increases, the resistivity
(A) Decreases
(B) increases.
(C) First decreases and then increases
(D) First increases and then decreases

f. Burger’s vector of an edge dislocation is
(A) Parallel to dislocation line
(B) Perpendicular to dislocation line
(C) At any angle with dislocation line including 0 and 90°
(D) None of the above

g. In photoelectric effect the number of electrons emitted is proportional to
(A) work function of cathode
(B) velocity of incident beam
(C) frequency of incident beam
(D) intensity of incident beam

h. The fastest cooling rate is achieved when steel is quenched in
(A) air (B) oil
(C) water (D) brine water

i. The temperature below which certain materials are ferromagnetic and above
which they are paramagnetic is called
(A) Neel temperature (B) Curie temperature
(C) Weiss temperature (D) None of these

j. A Zener diode is used as
(A) a coupler (B) a rectifier
(C) an amplifier (D) a voltage regulator

Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Increasing the temperature of a semiconductor breaks covalent bonds. For
each broken bond, two electrons become free to move and transfer
electrical charge.
(i) What fraction of valence electrons are free to move and
(ii) What fraction of the covalent bonds must be broken in order that
5 1015 electrons conduct electrical charge in 50 gm of silicon? (8)

b. Calculate the atomic radius in cm for the following:
(i) BCC metal with ao=0.3294 nm and one atom per lattice point.
(ii) FCC metal with ao = 4.0862 and one atom per lattice point. (8)

Q.3 a. Explain phase rule and what does it indicate? Show that eutectoid reaction
is non-variant. (8)

b. What are crystal imperfections? Discuss Burger’s vector. (8)

Q.4 a. Explain with suitable diagrams the atomic model of diffusion. How does
drift current differ from diffusion current? What is Einstein’s relation? (8)

b. Iron is often coated with a thin layer of zinc if it is to be used outside.
Explain why? What are the precautions which should be considered while
handling or recycling this product? (8)

Q.5 a. What material can be used for the electrical contacts in an electrical
switching device which opens and closes frequently and forcefully? What
properties should the contact material possess? Would Al2O3 be a good
choice? Explain. (8)

b. Discuss, briefly, various properties and applications of dielectric
materials. . (8)

Q.6 a. In a semiconductor the effective mass of an electron is 0.07 mo and that of
a hole is 0.4 mo, where mo is the free electron mass. Assuming that the
average relaxation time for the holes is half that for the electrons, calculate
the mobility of the holes when the mobility of the electrons is
0.8 m2volt –1 s–1 (8)

b. State and explain Hall effect. What are its applications? (8)

Q.7 a. Discuss properties and applications of following
(i) Bakelite. (ii) Mica. (8)

b. The density of nickel is 8.90 × 103 kg/m3. Avogadro’s number is 6.023 ×
23 10 atoms/mol. Atomic weight of Ni is 58.71 gm/mol. Calculate (i) the
saturation magnetization (ii) the saturation flux density. (8)

Q.8 a. Explain why ferromagnetic materials can be permanently magnetized
whereas paramagnetic ones cannot? (8)

b. In the context of processing of electronic materials, explain oxidation,
diffusion and metallization. (8)

Q.9 a. Explain the term ‘welding’. Describe the process of extrusion giving its
advantages. (8)

b. Briefly describe the process and purpose of the following heat treatment
operations
(i) Hardening.
(ii) Tempering (8)
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