SOLID STATE DEVICES AND SEMICONDUCTOR (SSDC)

SOLID STATE DEVICES AND SEMICONDUCTOR (SSDC)
SEM-IV, 2013
UTU PREVIOUS YEAR QUESTION PAPERS

TIME: 2 hour

Max. Marks: 50

Note: Attempt all the questions. Assume suitable data if necessary.

 Attempt any four parts of the following:

1. Explain briefly about the Zener diode as shunt regulator.
2. Describe about the superconductor materials.
3. A LED materials energy gap equals 2.5 eV. What wavelength will it radiate?
4. Write a short note on Insulated Gate Bipolar Transistor (IGBT).
5. Write the merits and demerits of Gunn diode.
6. Name and explain the three conditions for lasing action.

Electronic device and circuits (utu question paper)

ELECTRONIC DEVICE AND CIRCUIT
SEM-III, 2011-12
UTU PREVIOUS YEAR QUESTION PAPERS

time : 3hr] 

Total marks :100

SECTION A

Q1:- Attempt any four of the following :

1. Distinguish between
   (i) intrinsic semiconductor and extrinsic semiconductor
   (ii) energy level and energy band
2. A silicon p-n junction employs the following doping levels : N_A = 1 x 10⁶ cm^-3 and  N_D = 5 x 10¹⁵ cm^-3 . Determine the hole and electron concentration on the two sides.
    [ For silicon, n_i  = 1.08 x 10¹⁰   cm^-3]
3. Due to manufacturing error, the p-side of a pn junction has not been doped. If    N_D = 3 x 10¹⁶ cm^-3, calculate the built in potential at T = 300 K.
4. In the junction shown in fig 1, the depletion region has a width of b on the n side and a on the p side. Sketch the electric field as a function of x.

   

   FIG.1

5. Find the resistivity of intrinsic Si at 300 K.
   
   ( μ_n = 1350 cm² /V –s and μ_p = 480 cm² /v –s ) and (n₁  = 1.5 x 10¹⁰   cm^-3).
6. Discuss the role of Ebers Moll and Hybrid- pi model used for BJT.

ELECTROMAGNETIC FIELD THEORY

ELECTROMAGNETIC FIELD THEORY
(EMFT)
SEM-IV, 2011
B TECH QUESTION PAPERS
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 hours

Total marks:100

Attempt any four part of the following

1. State and explain Divergence theorem in detail.
2. Explain the cylindrical coordinate system with the concept of incremental length.
3. Two charges of similar sign and magnitude 1×10^-12 C are located one meter apart. What is the potential at a point that is midway between the two charges and 50cm from the line connecting the charges?
4. Find the divergence of A? If A = rsinΦI_r+2rcosΦI_Φ+2Z²I_z
5. Find the field of a sheet of charge in which symmetry is about plane?
6. Find the constant a, b, c so that V = i(x + 2y + az) + j(bx – 3y – z) + k(4x + cy + 2z) is irrational.

ANALOG INTEGRATED CIRCUITS (utu previous year question papers)

ANALOG INTEGRATED CIRCUITS
SEM-IV, 2011
B TECH QUESTION PAPER
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 hours

Total marks: 100

Attempt any four of the following:

1. Draw and explain the working of Wilson current mirror circuit and its improved version.
2. Design a Widlar current source for operating a constant current I_o=10µA. Assume V_CC=10 V, V_BE= 0.7 V and β =125 (use V_T= 25 mV).
3. Draw and explain the circuit of a V_BE multiplier.
4. When does a current mirror circuit deviates from the ideal condition?
5. Why is cascade configuration used in an Op-amp? Are FET op-amp better than BJT?
6. Explain MOS current steering circuits in brief.

DIGITAL ELECTRONICS & DESIGN (utu previous year question papers)

DIGITAL ELECTRONICS & DESIGN ASPECTS
SEM-III, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Attempt any four parts of the following:

1. Determine the base b in each of the following cases:
   (a) (361)₁₀ = (551)_b
   (b) (859)₁₀ = (5B7)_b
2. Write the 8-bit signed magnitude , 2's complement and 1's complement from the following decimal numbers:
   (a) +119
   (b) -77
3. Write out the first ten number for a decimal weighted codes: 7, 4, 2, 1
4. Using the theorems of Boolean algebra simplify the following expression:
   
5. What is difference between a Latch and a flip-flop?
6. What is race around condition and how it is overcome?

ELECTROMAGNETIC FIELD THEORY

ELECTROMAGNETIC FIELD THEORY
SEM-IV, 2012
B.TECH
UTTARAKHAND TECHNICAL UNIVERSITY
utu question paper

Time: 3 Hours

Total Marks: 100

SECTION A

Attempt any four questions

1. Suppose an electric field
   
   
   is as given then determine the following:
   (i) E at P if P (r = 0.8, Ø=30^o, θ=45)
   (ii) |E| at p.
   (iii) A unit vector in direction of E at P.
2. State and prove Gauss-Divergence theorem. Also comment on its physical significance with respect to flux in flow in a spherical conductor?
3. A solenoid 50 cm long, 2 cm in diameter and contains 1500 turns. The cylindrical core has a diameter of 2 cm and a relative permeability of 75. This coil being coaxial with a second solenoid, also 50cm long, but with a 3 cm diameter and 1200 turns. Calculate
   (i) L for the inner solenoid
   (ii) L for the outer solenoid
   (iii) M between the two solenoid?
4. Discuss the problem wave propagation in free space and also obtain the value for intrinsic impedance?
5. Given a non-magnetic material with
   E_r = 3.2, σ = 1.5 x 10^-4 S/m. Evaluate the values of
   (i) loss-tangent (ii) attenuation constant (iii) phase constant (iv) intrinsic impedance?
6. Discuss pointing vector and pointing theorem. Also describe its significance with respect to power calculate for plane wave propagation? 

ANALOG COMMUNICATION (utu question paper)

ANALOG COMMUNICATION

SEM.IV, 2012
B.TECH
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Note: Attempt all questions. Each question carries equal marks

Attempt any four parts of the following:

1. Explain frequency division multiplexing and time division multiplexing, also compares them.
2. What do you understand by Hilbert transform and inverse Hilbert transform? Write properties and application of Hilbert transform.
3. Describe Quadrature Amplitude Modulation. Give its application?
4. Explain following
   (i) Modulation index
   (ii) Envelope detector
   (iii) Baseband and passband signals
   (iv) Signal power
5. Draw the circuit of balanced modulator using  FETs. Explain its operation in mode 1 and mode 2.
6. Explain square law diode modulation method for AM generation. In an AM system, the modulating signal is sinusoidal with frequency f Hz. If 70%  modulation is used, then find the ratio of total sideband power in the modulation signal to the total power in the modulation signal to the total power.

COMMUNICATION ENGINEERING utu previous year question papers

communication eng.
sem 4th
utu previous year question paper

Time: 3 hours

Total marks: 100

Note: Draw diagrams and waveform wherever needed.

Attempt any three:

1. What is amplitude modulation? Explain its generation.
2. Explain DSBSC with its generation.
3. What is super heterodyne receiver?
4. With the help block diagram explain working of automatic frequency control unit.

SIGNALS & SYSTEMS (utu previous year question paper)

SIGNALS & SYSTEMS
B.Tech Examination
SEM-IV,2011
UTTARAKHAND TECHNICAL UNIVERSITY
utu previous year question papers

Time: 3 Hours

Total Marks: 100

Section A

Attempt any four of the following:

1. With suitable example define the periodic and non-periodic signals.
2. Differentiate between the following systems:
   (i) Static systems and dynamic systems
   (ii) Stable Systems and unstable systems.
3. Consider the system : Y(t) = sin[x(t + 2)] determine whether the system is
   (i) Linear
   (ii) Stable
   (iii) Casual
   (iv) Time invariant
   (v) Memoryless.
4. Check the following system for time invariance
   (i) Y(t) = sin [x (t)]
   (ii) Y[n] = nx[n]
5. Check the following system for stability
   (i) Y(t) = e^x(t)
   (ii) X(n) = Aⁿ u(n)
6. Determine the infinite power P^∞ and infinite energy E^∞ of the following signals:
   (i) X(t) = e^-2t u(t)
   (ii) X[n] =(1/2ⁿ)u(n)

NETWORK ANALYSIS & SYNTHESIS ,(NAS)

NETWORK ANALYSIS & SYNTHESIS
(NAS)
B.Tech Examination
SEM.III, 2012-13
UTTARAKHAND TECHNICAL UNIVERSITY(UTU)

Time: 3 Hours

Total Marks  :100

Section A

Attempt any four of the following:

1. List the essential properties o a linear network systems.
2. State and explain Thevenin's Theorem. Can a Thevenin theorem be applied to a linear load only? Give reasons in support of your answer.
3. Define node, cutset, and twig.
4. Define the properties of driving point impedance function.
5. List the properties of the Laplace transform and its inverse, explaining time scaling and frequency scaling.
6. Which of the given polynomial is a Hurwitz polynomial?
   (i)  s³ + 4s² + 5s +2
   (ii) s⁴ + 7s³ + 6s² + 21s + 8

ELECTRONIC DEVICES & CIRCUITS (EDC)

ELECTRONIC DEVICE & CIRCUIT
(EDC)
B.Tech EXAMINATION
SEM III, 2012-13
UTTARAKHAND TECHNICAL UNIVERSITY(UTU)

Time: 3 hours

Total marks: 100

Section A

Attempt any four of the following:

1.    Why space charge region is called as depletion region? Which types of carriers are present in the space charge region?

2.    Discuss the working of Schottky diode and hot carrier diode in brief.

3.    A diode is biased at a current of 1 mA.
(a) Determine the current change if V_D changes by 1 mV.
(b) Determine the voltage change if I_D changes by 10%.

4.    Give the Barkhausen condition required in order for sinusoidal oscillator to be sustained.

5.    Derive an expression for the voltage gain of a CE transistor amplifier in terms of h-parameters.

6.    What is the advantage of using quaternary alloy in fabricating LEDs?

Utu previous year question paper sub:- Electronic Measurement and Instrumentation

Utu previous year question paper

sub:- Electronic Measurement and Instrumentation

B.tech sem III 

time 3 hrs

total marks 100}

Q1:- Attempt  any four parts of the following .

1.       Differentiate between the following terminology

(i)        Reproducibility and Drift

(ii)       Dead zone and Hysteresis.

2.       Discuss the advantages and disadvantages associated with capacitive transducers.

3.       Explain the working principle of Kelvin Bridge.

4.       Mention the merits and demerits of digital measurement over analog measurements.

5.       Explain how measurement of high resistances can be done.

6.    Classify transducers by taking suitable examples and mention their area of application.

ENGINEERING ECONOMICS & COSTING

engineering economics & costing

B.tech
sem iii, 2012-13
UTTARKHAND TECH. UNIVERSITY 
 utu previous year question papers

Time: 3 Hours

Total Marks :100

Attempt any 4 question. Each question carries 5 marks :

1. Mr. Vinay plans to send his son for higher studies abroad after 10 years. He expects the cost of these studies abroad after 10 years. He expects the cost of these studies would be Rs. 1,00,000. How much should he save annually to have a sum of Rs. 1,00,000 at the end of 10 years, if the interest rate is 12 %.
2. At the time of his retirement , Mr. X is given a choice between two alternatives:
   (a) An annual pension of Rs. 10000 as long as he lives 
   (b) A lump sum amount of Rs. 50000.
    If Mr .X expects to live for 15 years and the interest rate is 15 percent, which option appears more attractive?
3. What amount must be deposited today in order to earn an annual income of Rs. 5000 beginning from the end of 15 years from now? The deposit earns 10 % per year.
4. What do you understand by time value of money?
5. Raghu borrows Rs. 80000 for a musical system at a monthly interest rate of 1 %. The loan is to be repaid in 12 equal monthly installments, payable at the end of each month. Prepare the loan amortization schedule.
6. You want to borrow Rs. 1500000 to buy a flat. You can approach a housing company which charges 13 % interest. You can pay Rs. 200000 per year towards the loan amortization. What should be maturity period of the loan?

NETWORK ANALYSIS & SYNTHESIS

UTTARAKHAND TECH. UNIVERSITY

UTU

B TECH (SEM III),2011-2012

SUB:-NETWORK ANALYSIS & SYNTHESIS  

time : 3hr] 

Total marks :100

SECTION A

Q1:- Attempt any four of the following :

1. (i) What is cutset matrix? How is it prepared?
   (ii) Derive general equilibrium equation of a network using cutset matrix Q, branch admittance [Y_b], current source vector [I_s] and voltage source vector [V_s].
   
2. Write the matrix loop equation for the network shown in figure.1 using the loop analysis.
   
   

   

   fig.1

3. Draw the oriented graph of the network for the fundamental cut-set matrix given below:

   

   
   

   
   
4. Explain the term Duality and draw the dual of network as shown in figure 1.
5. Define the terms (A) Node (B) Branch (C) Tree& Cotree (D) Cutset (E) Tieset.
6. Derive the relation between Branch voltage matrix, Twig voltage matrix and Node voltage matrix of a network as shown in figure 2.

   

   fig.2
   

ELECTRONIC MEASUREMENT & INSTRUMENTATION

UTTARAKHAND TECH. UNIVERSITY

utu previous year question papers

B TECH (SEM III),2011-2012

SUB:- ELECTRONIC MEASUREMENT & instrumentation  

time : 3hr]

Total marks :100

SECTION A

Q1:- Attempt any four of the following :

1. Why springs are used in measuring instruments?
2. Why shunt resistance are used in an ammeter? How much its value should be?
3. If a voltmeter uses a meter with  I_Fs = 2 mA. Obtain its sensitivity.
4. In how many ways transducers can be classify?
5. What is working principle of piezoelectric transducers?
6. Explain the working principle and application of thermocouple.

DIGITAL ELECTRONICS & DESIGN

DIGITAL ELECTRONICS & DESIGN ASPECTS
SEM-III, 2011-12
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY

time : 3hr]

Total marks :100

Note: Attempt all questions. Be precise in your answer.

SECTION A

Q1:- Attempt any four of the following :

4 ͯ 5=20

1. Convert the following numbers with the indicated bases to decimal :
   (a) (198)_{12
   (b) (735)8    
   (c)} (16.5)₁₆
2. _{Convert decimal +46 and +29 to binary, using the signed 2's complement representation and enough digits to accommodate the numbers. Then (+29) + (-42).}
3. Represent the decimal number 5137 in
   (a) BCD
   (b) Excess -3 code
   (c) 8421 code.
4. Express the following function as a sum of minterms and as a product of maxterms :
   F(A, B, C, D) = B'D = A'D = BD.
5. Minimize the following expression using K-map :
   F(A, B, C) = (1, 2, 6, 7) + d (0, 5).
6. Discuss the Hamming code? How does it detect and correct single error?