Pre engineering model question papers

Model Question Paper (CBCS) with effect from 2015-16

First/Second Semester B.E. Degree(CBCS)Examination

Basic Electrical Engineering Time: 3 hrs. Max. Marks: 80

Note: Answer any FIVE full questions, choosing one full question from each module.

Module-1 1 a.

b.

c.

A circuit has 1000 turns enclosing a magnetic circuit in section, with the flux density is and with it is Find the mean value of the inductance between these current limits and the induced electromotive force if the current fell uniformly from

Also determine the energy stored at the end of (05 Marks) Find the value of and the current flowing through it in the circuit shown when the current in branch is zero. Workout the problem stating the reasons at different steps. (05 Marks)

Fig. Q1 (b)

When load is applied to a unknown voltage source a current of flows and when the load resistance is increased to , the current drops to If a load of is connected across the source, what is the voltage across is it? Also calculate the power dissipated in the circuit. (06 Marks)

OR 2 a.

b.

Calculate the power delivered to in the circuit shown in Fig. Q2 (a). (05 Marks)

Fig. Q2 (a)

A square coil of 10 cm side and with 100 turns is rotated at a uniform speed of 1000 rpm about an axis at right angles to a uniform field having a flux density of 0.5 T. Calculate the instantaneous value of induced emf when the plane of the coil is (a) at to the field, and (b) in the plane of the field. (05 Marks)

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USN 15ELE15/25

15ELE15/25

c. Two toroidal solenoids are wound around the same form so that the magnetic field of one

passes through the turns of the other. Solenoid 1 has 700 turns and solenoid 2 has 400 turns. When the current in solenoid 1 is 6.52 A, the average flux through each turn of solenoid 2 is 0.0320 Wb. (a) What is the mutual inductance of the pair of solenoids? (b) When the current in solenoid 2 is 2.54 A, what is the average flux through each turn of solenoid 1. (06 Marks)

Module-2 3 a.

b.

c.

Explain the principle of operation of dc motor. (05 Marks) Explain with a diagram (legible), the constructional features and operation of an induction type single phase energy meter. Show that revolutions of the disc is proportional to the energy consumed. (05 Marks) In a , compound generator the resistance of armature, shunt and series windings are

respectively. The load consists of 200 lamps each rated at Find the total electromotive force and armature current when the machine is

connected (a) long shunt; (b) short shunt. Ignore armature reaction and brush contact drop. (06 Marks)

OR 4 a.

b.

c.

Deduce the relation between back emf and voltage applied to a short shunt compound dc motor. Explain the variation of back emf and load current with respect to load changes. (05 Marks) Explain with a diagram (legible), the constructional features and operation of single phase dynamometer type wattmeter. What are its salient features? (05 Marks) A 4 pole, lap wound dc shunt generator has a useful flux of 0.08 Wb. The armature winding has 260 turns, each of resistance . Determine the terminal voltage when running at 1000 rpm and supplying an armature current of 55 A. (06 Marks)

Module-3 5 a.

b.

c.

Calculate the impedance AB and the phase angle between voltage and current in the circuit shown in Fig. Q5 (a). (05 Marks)

Fig. Q5 (a)

Explain the reason for the use of residual current circuit breaker. With relevant circuit diagram explain the operation of residual current circuit breaker. (05 Marks) When a voltage of 100 V at 50 Hz is applied to coil A, the current taken is 8 A and the power 120 W. When applied to coil B the current is 10A and the power 500 W. What current and power is taken when 100 V is applied to the two coils connected in series. (06 Marks)

OR 6 a.

b.

c.

Two voltages and at the same frequency and with a phase difference between them of act in series in a circuit. Find the voltage and its phase position relative to (05 Marks) A voltage of 125 V at 60 Hz is applied across a non – inductive resistor connected in series with a capacitor. The current is 2.2 A. If the capacitive reactive power is 256.5 VAR, calculate the resistance, capacitance, power factor and the power delivered to the circuit. Neglect the loss in the capacitor. (05 Marks) Write a short note on : (i) Miniature Circuit Breaker and (ii) Equipment Earthing (06 Marks)

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15ELE15/25

Module-4

7 a.

b.

c.

Prove that the line voltage in a star connected RYB phase sequence three phase system leads the phase voltage by Obtain an expression for line voltage in terms of phase voltage. (05 Marks) Each of two watt meters connected to measure the input to a three phase circuit reads 10 kW on a balanced load when the power factor is unity. What does each instrument read when power factor falls to 0.866 lagging. (05 Marks) Find the number of armature turns in series per phase and the total number of armature conductors required for the armature of a 3 phase, 50 Hz, 10 pole alternator with ninety slots. The winding is to be star connected to give a line voltage of 11000V. The flux per pole is 0.16 Wb. Coil span is 9 slots. Do not make any assumption. (06 Marks)

OR 8 a.

b.

c.

A balanced three phase, 400 V system supplies a balanced delta connected load. The current in each branch circuit is 20 A and the phase angle is lagging. Draw the phasor diagram showing the voltages and currents in the lines and circuits for the three phases. Mark the angles between phasors corresponding to phase A. The phase sequence is ABC. (05 Marks) A 3 phase, 6 pole star connected alternator revolves at 1000 rpm. The stator has 90 slots and 8 conductors per slot. The flux per pole is 0.05Wb. The winding is chorded by one slot. Calculate the distribution factor, pitch factor and the line voltage generated. (05 Marks) A three phase delta connected motor operating on a 400 V supply is delivering 25 HP at an efficiency of 0.87 and power factor of 0.42. Calculate the line current, phase current and the readings of two watt meters connected to measure the input. Assume,

Check the validity of wattmeter readings with any other available data in the problem. (06 Marks)

Module-5 9 a.

b.

c.

With reasoning, for a transformer, show that

The transformer can be considered as ideal. (05 Marks) A 6 pole alternator runs at 1000 rpm, and supplies power to a 4 pole, 3 phase induction motor. The frequency of rotor of induction motor is 2 Hz. Determine the slip and speed of the motor. Also, determine the slip at no load of the induction motor, if the difference between the synchronous speed and no load speed is 10 rpm. (05 Marks) A transformer has a maximum efficiency of at three-fourth of its full load and unity power factor. The copper loss at three-fourth full load and unity power factor is Compute the efficiency of the transformer at and rated full load at the same power factor. (06 Marks)

OR 10 a.

b.

c.

Show that a three phase winding when excited by a three phase supply establishes a rotating magnetic field. (05 Marks) Obtain an expression for the load kVA at which maximum efficiency occurs in a transformer. (05 Marks) Discuss the variation in rotor emf frequency of three phase induction motor as the load changes. Derive any formula used to substantiate the variation. (06 Marks)

* * * * *

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Basic Electronics Time: 3 hrs. Max. Marks: 80


Module-1 1 a.

b.

c.

Define following diode parameters: i) PIV ii) Knee voltage iii) Dynamic resistance. (06 Marks) With neat circuit diagram and waveforms, explain the working of a half wave rectifier. (06 Marks) Draw common emitter circuit and sketch the input and output characteristics. Also explain operating regions by indicating them on characteristics curve. (04 Marks)

OR 2 a.

b.

c.

Explain zener diode voltage regulator circuit with no load and with load. (06 Marks) The i/p to the Full wave rectifier is v(t) = 200 sin50t. If RL is 1kΩ and forward resistance of diode is 50Ω, find: i) D.C current through the circuit ii) The A.C (rms) value of current through the circuit iii) The D.C output voltage iv) The A.C power input v) The D.C power output vi) Rectifier efficiency. (06 Marks) Derive the relationship between α and β. Calculate the value of Ic, Ie for a transistor that has

= 0.98 and Ib = 100µA. (04 Marks)

Module-2 3 a.

b.

c.

What is a Dc load line? Explain Base biased method with necessary equations. (05 Marks) Explain the characteristics of an Ideal Op-amp. Mention two applications of Op-Amp. (06 Marks) With a neat circuit diagram, explain the Voltage Divider Bias circuit using approximate analysis. (05 Marks)

OR 4 a.

b. c.

Design the voltage divider bias circuit to operate from 12 V supply. The bias conditions are VCE=3V, VE=5V, and Ic = 1mA. (05 Marks) Derive the expression of 3 input summing amplifier. (05 Marks) Explain voltage follower with neat circuit and necessary equations. (06 Marks)

Module-3 5 a.

b. c.

Convert (1101101)2 = ( )10 and (69)10 = ( )2. (04 Marks) Convert (1010111011110101)2 = ( )16 and (FA876)16 = ( )2 (04 Marks) State and prove Demorgan’s Theorem. (08 Marks)

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USN 15ELN15/25

15ELN15/25

OR

6 a.

b. c.

Factorise the following Boolean equations ABBA 1Y , ))((2 BACCABY . (06 Marks) Realise half adder using NAND gates only. (05 Marks) Write a note on Full Adder. (05 Marks)

Module-4 7 a.

b. c.

Write a short note on clocked RS Flip-Flop. (04 Marks) Explain the architecture of 8051 microcontroller. (06 Marks) Explain the operation of NOR gate latch using its truth table. (06 Marks)

OR 8 a.

b.

c.

What is a RS Flip-Flop? Explain using its circuit diagram, logic symbol and truth table. (06 Marks) Using a block diagram, explain microcontroller based stepper motor control system. (06 Marks) Draw the traditional and IEEE logic symbol of AND, NOT, NOR, XOR and XNOR. (04 Marks)

Module-5 9 a.

b. c.

With a neat block diagram, explain the elements of communication systems. (05 Marks) Explain the construction and the principle of operation of LVDT. (05 Marks) Bring out the differences between amplitude modulation and frequency modulation. (06 Marks)

OR 10 a.

b. c.

Explain frequency modulation with neat waveforms. (05 Marks) Derive equations for Amplitude Modulation and sketch the necessary waveforms. (05 Marks) A500 W, 100KHz carrier is modulated to depth of 60% by modulating signal of frequency 1KHz.Calculate the total power transmitted. What are the side band components of the AM wave? (06 Marks)

* * * * *

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USN 15CED14/24

First/Second Semester B.E. Degree (CBCS) Examination

COMPUTER AIDED ENGINEERING DRAWING

Time: 3 Hours (COMMON TO ALL BRANCHES) Max. Marks:80

Note: l.Answer three full questions 2. Use A4 sheets supplied 3. Draw to actual scale 4. Missing data, if any, may be suitably assumed

1. a. A point is lying on HP, 20 mm behind VP and 25 mm in front

of RPP. Draw its projections and name the side view.

10 Marks

b. A line AB measuring 70 mm has its end A 15 mm in front of VP and 20 mm above HP and the other end B 60 mm in front of VP and 50 mm above HP. Draw the projections of the line and find the inclinations of the line with the both the reference planes of projection

OR

15 Marks

1. A pentagonal lamina of edges 25mm is resting on HP with one of its corners such that the edge opposite to this corner is 20mm above HP and makes an angle of 45o with VP. Draw the top and front views of the lamina in this position. Determine the inclination of the lamina with HP.

25 Marks

2. A hexagonal pyramid 25mm side of base and 50mm axis length rest on HP on one of its slant edges. Draw the projections of pyramid when the axis is inclined at 45o with VP. Show all three views.

30 Marks

3. A regular pentagonal pyramid of side of base 35mm and altitude 65mm has its base on HP with a side of base perpendicular to VP. The pyramid is cut by a section plane which is perpendicular to VP and inclined at 30o to HP. The cutting plane meets the axis of the pyramid at a point 30mm below the apex. Draw the development of the remaining part of the pyramid.

OR

25 Marks

3. A regular pentagonal prism of base sides 30mm and axis 60 mm is mounted centrally over a cylindrical block of 80mm diameter and 25mm thick. Draw the isometric projection of the combined solids.

25 Marks

* * * * *



Elements of Civil Engineering and Engineering Mechanics Time: 3 hrs. Max. Marks: 80


Module-1 1 a.

b. c.

Explain briefly the role of Civil Engineers in the infrastructure development of a country. (06 Marks) Draw typical cross section of a road and explain its components. (06 Marks) Define Couple. Explain its characteristics. (04 Marks)

OR 2 a.

b. c.

Explain briefly the scope of the following Civil Engineering fields. i) Structural Engineering ii) Geotechnical Engineering. (04 Marks) Distinguish between gravity dams and arch dams, with neat sketches. (05 Marks) Replace the force and couple system by an equivalent force and moment at ‘A’ shown in fig.Q2(c) (07 Marks)

Module-2 3 a.

b.

Two locomotives moving on opposite banks of a canal can pull a vessel parallel to the banks by means of two ropes. The force in the ropes are 20kN and 24kN, while the total angle between them is 600. Find the resultant pull on the vessel and the angles α and β. (08 Marks) State and prove parallelogram law of forces. (08 Marks)

OR 4 a.

b. c.

State and prove Lami’s theorem. (04 Marks) Explain with sketches i) Cone of friction ii) Angle of repose. (04 Marks) Find the magnitude, direction and position of the resultant with respect to the point ‘A’ for the force system shown in the fig.Q4(c). (08 Marks)

Module-3 5 a.

b. c.

State and prove Varigon’s theorem. (05 Marks) Explain the different types of loads in the analysis of beams. (03 Marks) Determine the support reactions in the simply supported beam shown in the fig.Q5(c). (08 Marks)

OR 6 a.

b.

Calculate the support reactions at A, for the beam shown in fig. Q6(a). The beam is hinged at point A and supported by cable CD. Self – weight of the beam is 2kN/m (udl) as indicated. (08 Marks) Determine the reactions at the contact points in the fig.Q6(b). (08 Marks)

Module-4 7 a.

b.

State and prove parallel axis theorem. (08 Marks) Determine the centroid of the lamina shown in fig. Q7(b). (08 Marks)

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USN 15CIV13/23

15CIV13/23

OR 8 a.

b.

Determine the moment of inertia of the shaded area shown in fig. Q8(a) about the x-x axis. (08 Marks) Derive the expressions of centroid of a semi – circle by method of integration. (08 Marks)

Module-5 9 a.

b. c.

Define i) Displacement ii) Velocity iii) Speed iv) Acceleration. (04 Marks) What is Super elevation and what is its necessity? (04 Marks) A projectile is fired from the top of a cliff 150m height with an initial velocity of 180m/sec at an upward angle of 300 to horizontal. Neglecting air resistance determine the horizontal distance from the gun point to the point where the projectile strikes the ground. (08 Marks)

OR 10 a.

b.

Two objects A and B are projected vertically at 130m above the ground level. A is projected up with a velocity of 30m/sec and B is projected downwards with the same velocity. Find the time taken by each object to reach the ground. (08 Marks) A pulley 300mm in diameter is wounded round by a rope with one of the ends of rope fixed to pulley and the other end is fixed to a weight freely hanging as shown in fig.Q10(b). The weight moves down by 8m after starting from rest in 4 seconds. Find the angular velocity of the pulley. Find also the total distance moved by the weight to make the pulley to rotate 400 revolutions. (08 Marks)

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15CIV13/23

* * * * *

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Elements of Mechanical Engineering Time: 3 hrs. Max. Marks: 80


Module-1 1 a.

b.

With a neat sketch briefly explain the Hydro-electric power plant. (08 Marks) Write the difference between Renewable & Non Renewable energy resources. (08 Marks)

OR 2 a.

b.

Briefly explain the construction & working of Lancashire Boiler with a neat sketch. (08 Marks) Define: i) Wet Steam; ii) Enthalpy of wet steam; iii) Dryness fraction. (08 Marks)

Module-2 3 a.

b.

Explain the De Laval’s Turbine and Parson’s Turbine with a neat sketch. (08 Marks) With a neat sketch explain the working principle of Pelton wheel turbine. (08 Marks)

OR 4 a.

b.

With a neat sketch Briefly explain the 4 stroke Diesel engine. (08 Marks) The following observations were obtained during a trial on a 4 stroke diesel engine. Cylinder diameter =25 cm, stroke of the piston = 40cm, crankshaft speed = 250 rpm, Brake load = 70 kg, brake drum diameter = 2m, Mean Effective pressure = 6 bar, Diesel oil consumption = 0.1 m3/ min, Specific gravity of diesel = 0.78, Calorific value of diesel = 43,900 kJ/kg. Find Break Power, Indicated Power, Friction Power, Mechanical Efficiency, Break Thermal Efficiency, and Indicated Thermal Efficiency. (08 Marks)

Module-3 5 a.

b.

Briefly Explain the following machining processes on a lathe with the help of neat sketches: i) Knurling ii) Facing iii) Drilling. (08 Marks) Explain with a neat sketch the taper turning by swivelling compound rest method and also the countersinking process in a lathe. (08 Marks)

OR 6 a.

b.

Briefly explain the different types of Automation. (08 Marks) Sketch the polar and Cartesian coordination of Robotic Configuration. (08 Marks)

Module-4 7 a.

b.

Write a note on Ferrous Alloys.( Any Two) (08 Marks) Briefly explain the types and applications of Non-ferrous alloys.( Any three) (08 Marks)

OR 8 a.

b.

With a neat sketch briefly explain the Oxy-acetylene Welding method. (08 Marks) With a neat sketch briefly explain the Soldering Method. (08 Marks)

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USN 15EME14/24

15EME14/24

Module-5

9 a. b.

Briefly explain the construction & working of Vapor Compression Refrigeration. (08 Marks) Differentiate between Vapour Absorption and Vapour Compression Refrigeration. (08 Marks)

OR 10 a.

b.

What is air-conditioning? How is it achieved in a domestic air conditioner? (08 Marks) Explain the properties of good refrigerant. (08 Marks)

* * * * *

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First/Second Semester B.E. Degree(CBCS)Examination,

Engineering Chemistry Time: 3 hrs. Max. Marks: 80


Module-1 1 a.

b. c.

Derive Nernst equation for electrode potential. (05 Marks) Discuss the construction and working of calomel electrode. (05 Marks) Explain the following characteristics of battery: i)cell potential ii) current and iii) cycle life. (06 Marks)

OR 2 a.

b. c.

What is electrolyte concentration cell? The cell potential of concentration cell of copper was measured 0.0592V. One of the concentrations of the CuSO4 solutions was 0.001M. Calculate the concentration of other CuSO4 solution. (05 Marks) Discuss the construction and working of Li-MnO2 battery. (06 Marks) Discuss the construction and working of methanol-oxygen fuel cell. (05 Marks)

Module-2 3 a.

b. c.

Explain the following factors affecting the rate of corrosion: i) ratio of anodic to cathodic area ii) nature of metal and iii) conductivity of medium. (06 Marks) Discuss the sacrificial anodic method of control of corrosion. (05 Marks) Discuss the electroplating of nickel using Watt’s bath. (05 Marks)

OR 4 a.

b.

c.

Explain the pitting and waterline corrosion. (05 Marks) Explain the following factors influencing the nature of electro-deposit: i) current density ii)concentration of electrolyte and iii) pH of plating bath. (06 Marks) Explain the manufacturing process of double sided PCB with copper. (05 Marks)

Module-3 5 a.

b. c.

Explain the determination of calorific value of a solid fuel using bomb calorimeter.(06 Marks) Discuss the synthesis of petrol by Fishcher-Tropsch process. (05 Marks) Discuss the construction and working of PV cells. (05 Marks)

OR 6 a.

b. c.

Explain the modules, panels and arrays of PV cells. (06 Marks) Discuss the production of solar grade silicon by union carbide process. (05 Marks) 0.85g of coal sample (carbon 90%, H2 5% and ash 5%) was subjected to combustion in a bomb calorimeter. Mass of water taken in the calorimeter was 2500cm3 and the water equivalent of the calorimeter was 650cm3. The rise in temperature was found to be 3.2°C. Calculate the gross and net calorific values of the sample. Latent heat of steam = 2.457 KJg-1 and specific heat of water = 4.187 KJ Kg-1 K-1. (05 Marks)

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USN 15CHE12/22

15CHE12/22

Module-4

7 a. b.

c.

Explain the types of polymerization with example. (04 Marks) Explain the following factors influencing the Tg: i) inter molecular forces ii) flexibility and iii) branching & cross linking. (06 Marks) Write the synthesis reactions of following polymers: i)PMMA ii) polyurethane and iii) polycarbonate. (06 Marks)

OR 8 a.

b.

c.

A polymer sample contains 100, 200, 300 and 400 molecules having molecular mass 1000, 2000, 3000 and 4000 respectively. Calculate the number average and weight average molecular masses of the polymer. (05 Marks) What is conducting polymer? Explain the mechanism of conduction in polyaniline. (06 Marks) Write the synthesis reactions and properties of silicone rubber. (05 Marks)

Module-5 9 a.

b.

c.

Explain the scale and sludge formation in boiler. (05 Marks) Explain the determination of dissolved oxygen content in water by Winkler’s method. (06 Marks) Write a note on fullerenes. (05 Marks)

OR 10 a.

b.

c.

Explain desalination of sea water by ion selective electro dialysis process. (05 Marks) Explain the synthesis of nano material by chemical vapour condensation and precipitate methods. (06 Marks) Write a note on dendrimers. (05 Marks)

* * * * *

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Engineering Mathematics-I Time: 3 hrs. Max. Marks: 80


Module-1

1

a.

b.

c.

d.

Find the nth derivative of (04 Marks) Find the angle between the radius vector and the tangent for the curve

and also find the slope of the tangent at (04 Marks) Find the angle of intersection between the curves r2sin2 and r2=16 sin2 . (04 Marks) Obtain the Pedal equation of the curve (04 Marks)

OR 2 a.

b.

c.

If prove that (06 Marks) Find the pedal equation , rn=an cosn (05 Marks) Show that the radius of curvature of the curve x3 + y3 =3axy at (05 Marks)

Module-2 3 a.

b.

c.

d.

Expand in powers of ( up to fourth degree term. (04 Marks)

Evaluate (04 Marks)

If prove that (04 Marks)

If , then prove that (04 Marks)

OR

4

a.

b.

c.

Prove that (06 Marks)

If u= f(x-y, y-z, z-x) then prove that (05 Marks)

If (05 Marks)

Module-3 5 a.

b.

A particle moves along the curve x=1-t3, y=1+t2 and z= 2t-5, find the velocity and acceleration. Also find the components of velocity and acceleration at t=1 in the direction 2i+j+2k. (08 Marks) Find the constants so that the vector field is irrotational. (08 Marks)

OR 6 a.

b.

If kzjyixu 222 and kxyjxziyzv

then prove that is a solenoidal vector. (08 Marks) Find and if . (08 Marks)

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USN 15MAT11

15MAT11

Module-4

7

a.

b. c.

Obtain the reduction formula for . (06 Marks) Solve . (05 Marks) Find the Orthogonal trajectories of the family of cardioids where is the parameter. (05 Marks)

OR

8

a.

b.

c.

Evaluate . (06 Marks) Solve (05 Marks) If a substance cools from 370k to 330k in 10minutes, when the temperature of the surrounding air is 290k. Find the temperature of the substance after 40 minutes. (05 Marks)

Module-5 9 a.

b.

c.

Solve the following system of equations by Gauss elimination method

(06 Marks) Use power method to find the largest eigen value and the corresponding eigen vector of the matrix taking as initial eigen vector

(05 Marks) Show that the transformation

is non-singular. Find the inverse transformation (05 Marks)

OR 10 a.

b.

c.

Solve the following system of equations by Gauss-Seidel method

(05 Marks) Reduce the following matrix to the diagonal form

(05 Marks)

Reduce the quadratic form to the canonical form by orthogonal transformation. (06 Marks)

* * * * * 2 of 2



Engineering Physics Time: 3 hrs. Max. Marks: 80

Note: 1. Answer any FIVE full questions, choosing one full question from each module. 2. Physical Constants: Velocity of light, c = 3x108m/s, Planck’s constant,

h = 6.625x10-34 JS; Mass of electron m= 9.1x10-31kg; Boltzmann constant, k = 1.38x10-23 J/K; Avagadro number, NA = 6.02X1026/K mole

Module-1

1 a. b.

c.

State Planck’s law of black body radiation. Show that Planck’s law reduces to Wien’s law and Rayleigh Jeans law at lower and higher wavelength limits respectively. (07 Marks) Based on Heisenberg’s uncertainty principle, show that electrons cannot exist within the nucleus. (05 Marks) Calculate the de Broglie wavelength of an electron moving with a K.E. of 50 Kev. (04 Marks)

OR 2 a.

b.

c.

What is phase velocity and group velocity? Show that group velocity is equal to particle velocity. (05 Marks) Obtain the solution of Schrodinger’s time independent wave equation for a particle in a one dimensional potential box of infinite height. (07 Marks) X-rays of wavelength 0.75 Å are scattered from a target at an angle of 45o. Calculate the wavelength of scattered X-rays. (04 Marks)

Module-2 3 a.

b. c.

What is Fermi level? Describe the variation of Fermi factor with temperature. (05 Marks) What is Meissner effect? Write a note on Type – I and Type – II super conductors. (07 Marks) For intrinsic gallium arsenide, the room temperature electrical conductivity is 10-6 ohm-1m-1. The electron and hole mobilities are respectively 0.85 m2/Vs and 0.04 m2/Vs. Calculate the intrinsic carrier concentration at room Temperature. (04 Marks)

OR 4 a.

b. c.

Explain the BCS theory of super conductivity. (05 Marks) State law of mass action. Obtain an expression for the intrinsic carrier density. (07 Marks) Calculate the probability of finding an electron at an energy level 0.02 eV above Fermi level at 300K. (04 Marks)

Module-3 5 a.

b. c.

Explain the construction and working of carbon dioxide Laser. (08 Marks) Obtain an expression for the numerical aperture of an optical fiber. (04 Marks) The average power output of a laser beam of wavelength 6500 Å is 10 mw. Find the number of photons emitted per second by the laser source. (04 Marks)

OR 6 a.

b. c.

What is holography? Explain the principle and method of recording an image on a hologram. (06 Marks) Explain the different types of optical fibers. (06 Marks) An Optical signal propagating in a fiber retains 85% of input power after travelling a distance of 500 m in the fiber. Calculate the attenuation coefficient. (04 Marks)

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USN 15PHY12/22

15PHY12/22

Module-4 7 a.

b.

c.

Obtain an expression for the inter planar distance in a cubic crystal in terms of Miller indices. (05 Marks) What is atomic packing factor? Calculate the atomic packing factor for SC, FCC and BCC structures. (07 Marks) First order spectrum is formed when X - rays of wavelength 1.5 Å is incident on a crystal at a glancing angle 0f 120. Calculate the inter planar distance. If the Miller indices of the plane is ( 1 0 1 ) , then find the lattice constant. (04 Marks)

OR 8 a.

b. c.

With the help of a neat diagram explain the crystal structure of diamond and calculate its atomic packing factor. (06 Marks) Explain allotropy and polymorphism. (06 Marks) Draw the crystal planes ( 1 2 0 ) and ( 1 0 1 ) in a cubic crystal. (04 Marks)

Module-5 9 a.

b.

c.

What is Mach number? Explain the difference between ultra sonic and acoustic Waves? (04 Marks) What is a carbon nano tube? Explain how it is synthesized using pyrolysis method. (06 Marks) Explain the working of SEM with the help of a neat diagram. (06 Marks)

OR 10 a.

b. c.

Briefly explain the Rankine – Hugonit shock equations. (05 Marks) Explain the Sol - Gel method of synthesis of nano materials. (07 Marks) Write a note on applications of carbon nano tubes. (04 Marks)

* * * * *

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Programming In C and Data Structures Time: 3 hrs. Max. Marks: 80


Module-1 1 a.

b.

Here is list of possible names for variables in C language. Which are valid names and invalid names? If name is invalid, explain why? i) 1999_space ii) _apple iii) iNtEL v) one_2 v) for vi) #12 vii) i.b.m viii) help+me (08 Marks) What is the purpose of a printf() statement? Explain the formatted printf() along with the respective examples. (08 Marks)

OR

2 a.

b. c.

Write a C program to find area of a triangle when we know the lengths of all three of its sides. (05 Marks) Write a C program that computes the size of int, float, double and char variables. (05 Marks) What are Operators? Explain the relational and logical operators supported in C language. (06 Marks)

Module-2 3 a.

b.

Explain the Syntax of nested if …else statement. Write a C program to find largest of three numbers using nested if … else statement. (08 Marks) Explain the syntax of do-while statement. Write a C program to find the factorial of a number using while loop, where the number n is entered by the user. (Hint: factorial of n = 1*2*3*….*n). (08 Marks)

OR

4 a.

b.

Write a C Program to find GCD of two numbers using ternary operator and for loop. (08 Marks) Write a calculator program in C language to do simple operations like addition, subtraction, multiplication and division. Use switch statement in your program (08 Marks)

Module-3 5 a.

b.

c.

What is an array? Explain the declaration and initialization of single dimensional array with example. (05 Marks) Write a C Program to concatenate two strings without using built in function strcat( ). (05 Marks) Write a C program to check a number is a prime number or not using recursion. (06 Marks)

OR

6 a.

b. c.

What is function? Write a C program to find cube of a Number using function. (05 Marks) List string manipulation library functions and explain any two of them with example (05 Marks) Write a C Program to find greatest number from two dimensional array (06 Marks)

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Module-4 7 a.

b. c.

What is a structure? Explain the C syntax of structure declaration with an example. (04 Marks) What is a file? Explain file open and close functions with arguments. (04 Marks) Explain fputc( ),fputs( ), fgetc( ) and fgets() functions with syntax. (08 Marks)

OR

8 a.

b.

c.

Write a C program to store Name, USN, subject name and IA Marks of students using structure. (05 Marks) Explain how the structure variable passed as a parameter to a function with example. (05 Marks) Write a C program to read and display a text from the file. (06 Marks)

Module-5 9 a.

b. c.

Write and explain any five preprocessor directives in C. (05 Marks) Write a C program to swap two numbers using call by pointers method. (05 Marks) Explain malloc( ), calloc( )functions with examples. (06 Marks)

OR

10 a.

b.

Explain stack and queue related terms and give their applications. (08 Marks) What is pointer? Give the advantages and disadvantages of pointer data type. (08 Marks)

* * * * *

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Education

Pre engineering model question papers