Loyola College Electronics – I Question Papers Download

Loyola College M.Sc. Physics Nov 2006 Electronics – I Question Paper PDF Download

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                         LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – PHYSICS

AC 13

FIRST SEMESTER – NOV 2006

PH 1808 – ELECTRONICS – I

 

 

Date & Time : 31-10-2006/1.00-4.00     Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

  1. Draw the circuit diagram of an Integrator using an operational amplifier.
  2. State any two advantages of a R-2R D/A converter over a binary weighted D/A converter.
  3. Develop an ASM program for µP 8085 which sets the C register to 1 if the MSB or LSB of the number at memory location 8100h is ‘1’ else sets C register to 0.
  4. Develop a subroutine for µP 8085 to find the factorial of the number passed to it through the B register.
  5. Develop a program for µP 8085 to convert a two digit packed BCD number in register A to unpacked BCD format in BC register pair.
  6. Develop a program for µP 8085 to generate a square wave in SOD line.
  7. Develop a program segment for µP 8085 to mask RST5.5 and enable the rest.
  8. Write notes on the ALE and READY lines of µP 8085.
  9. State the advantage of relative branching available in Z80 over absolute branching.
  10. Develop an ASM program for µP Z80 to input 40 bytes from I/O port 30h and to store them from 8100h using string primitives.

 

PART – B

  1. Sketch neat circuit diagrams of Op-amp based inverting and non-­inverting amplifiers. Also derive expressions for their voltage gains. (6+6.5)
  2. With timing diagram, explain the instruction cycle for LXI H,FFFFH of µP 8085.
  3. If the crystal frequency of an 8085 system is 1 M.Hz, calculate the delay generated by the following segment of code.

MVI A,50H

rpt:       DCR A

JNZ rpt

  1. Write notes on the software and hardware interrupts available in µP 8085.
  2. Explain the various block transfer and block search instructions available in µP Z80.

 

PART – C

  1. Develop an interface and program for µP 8085 to implement an 8 bits successive approximation A/D converter.
  2. Develop a program for µP 8085 to solve n1Cr1 – n2Cr2 . Use a subroutine for factorial.
  3. There are eight LEDs and two switches (S0 and S1) connected to ports, PA and PB respectively. Develop an ASM program for mP 8085 to generate the following pattern.
S1 S0 LEDs
0 0 OFF
0 1 Binary Ascending
1 0 Left to Right
1 1 All Blinking

 

  1. Explain memory mapped I/O and I/O mapped I/O schemes of m Also explain with a neat circuit diagram how I/O mapped I/O scheme can be implemented with address decoding for 2 ROM chips of 8KB each and 6 RAM chips of 8KB each. (6+6.5)
  2. Develop a program for Z80 to copy the elements of an array into an overlapping array.

 

 

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Loyola College B.Sc. Physics Nov 2008 Electronics – I Question Paper PDF Download

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

CC 07

 

THIRD SEMESTER – November 2008

PH 3502 – ELECTRONICS – I

 

 

 

Date : 06-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A (10 x 2 = 20)

Answer ALL questions

  1. What is a current source?
  2. State maximum power transfer theorem.
  3. What is quiescent (Q) point?
  4. Mention any two uses of a Bistable multivibtator.
  5. Mention the characteristic features of OP-AMP.
  6. Draw the circuit of OP-AMP summing amplifier for four input.
  7. What is k-map?
  8. Draw the logic circuit for clocked RS flip-flop and give its truth table.
  9. What is a register?
  10. What are the difference between ROM and RAM?

PART – B (4 x 7.5 = 30)

Answer any FOUR questions

  1. State and prove Norton’s theorem.
  2. With necessary circuit explain the fixed bias circuit and derive the equation for its stability.
  3. Draw the inverting Op-Amp circuit and derive the equation for its ideal closed loop gain.
  4. Write a note on multiplexing and demultiplexing.
  5. Explain the function of a decade counter with logic circuit and truth table.

PART – C (4 x 12.5 = 50)

Answer any FOUR questions

  1. The h-parameters of a transistor in CE configuration are h fe=330, h ie=4.5 kilo ohm, h re=0.0002 and h oe=0.000030 mho, if the load resistance is 5 kilo-ohm and the internal resistance of the signal source is 10 kilo-ohm, then, calculate the values of current gain, input impedance, voltage gain, output admittance, out put impedance and power gain.
  2. Explain the function of a phase-shift oscillator using three RC sections with necessary diagram. Obtain the expressions for the conditions of oscillation and arrive at its frequency expression.
  3. Explain the construction, working and output characteristics of a FET.
  4. Explain the function of a JK master-slave flip-flop with logic diagram and truth-table.
  5. Explain the function of a 4-bit ripple counter with necessary circuit diagram, truth-table and

waves form.

 

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Loyola College B.Sc. Physics Nov 2010 Electronics – I Question Paper PDF Download

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – NOVEMBER 2010

PH 3504/PH 3502/PH 5501 – ELECTRONICS – I

 

 

 

Date : 30-10-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART  A

Answer  ALL  questions:                                                                                             (10 x 2 = 20 marks)

 

 

  1. Define a Constant voltage source.
  2. State Maximum Power transfer theorem.
  3. What is Zero signal collector current? What is its significance?
  4. Define Class A Power amplifier. What is its maximum efficiency?
  5. Define CMRR of a differential amplifier. How can it act as a figure of merit of a difference amplifier?
  6. Define ‘Inversion Layer’ with reference to MOSFET.
  7. What input conditions of a JK flip flop makes it toggle?
  8. What is the difference between a Decoder & a Multiplexer?
  9. How many flip flops are required to store a decimal no.100110 in a binary register.
  10. Mention any two differences between ROM & RAM.

 

PART  B

Answer  ANY FOUR  questions:                                                                            (4 x 7.5  = 30 marks)

 

  1. A constant dc voltage of 10 volts is connected in series with resistances 4Ω & 3Ω. Another load resistance RL is connected across the 3Ω resistance. Use Norton’s theorem to determine the current through RL in the circuit.
  2. What is the need for biasing the transistor? Explain the Fixed Bias method and the disadvantages faced in this method of biasing.
  3. Draw the circuit of i) Summing & ii) Difference Amplifier using Op-Amp and obtain an expression for their output.
  4. Draw the logic circuit of a D- Flip Flop and explain its working. How it can be modified to function as a T flip flop?
  5. Explain with the circuit the working of a decade counter using JK – flip flops.

 

 

 

 

 

PART  C

Answer  ANY FOUR  questions:                                                                           (4 x 12.5 = 50 marks)

 

  1. Describe the analysis of a transistor amplifier in CE mode using ‘h’ parameter and obtain the expression for Ai, AV and Z
  2. Draw Phase Shift oscillator circuit using Transistor and explain its working.
  3. Explain the mechanism of current conduction in a SCR. Explain the action of SCR as a half wave rectifier.
  4. Using K-map simplify the Boolean function:

F(A,B,C,D) = ∑(0,2,4,5,6,10,12,14). Implement the simplified expression using NAND gates only.

  1. Draw a 4-Bit RING counter using JK flip flops and describe the sequence of operations. What is the modulus of the counter?

 

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Loyola College B.Sc. Physics April 2011 Electronics – I Question Paper PDF Download

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – APRIL 2011

PH 3504/PH 3502/PH 5501 – ELECTRONICS – I

 

 

 

Date : 12-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

Answer ALL questions.                                                                                              (10 x 2 = 20 marks)

  1. State Norton’s theorem.
  2. State the conditions for oscillations in an Oscillator.
  3. Define β. Show that β= α/ (1-α)
  4. For an inverting amplifier using Op-Amp, R1=1K and Rf = 10 K. Assuming the
    amplifier to be ideal, calculate the output voltage for an input of 1V.
  5. Define CMRR.
  6. What is don’t care condition in K- map?
  7. Construct the K-map for a 4-variable truth table in which the output is high for the
    following input conditions ABCD = 1101, 1010, 0101, 1111
  8. What is a Multiplexer?
  9. The terminal count of a MOD 13 binary counter is________ a)1111   b) 1101 c) 1100
    d) 0100
  10. A 4-bit asynchronous counter uses Flip-Flops of propagation delay time 20 ns each.
    The maximum possible time required for change of state is  _________

a)60 ns   b) 20 ns   c)80 ns   d)40ns

PART – B

Answer ANY FOUR questions.                                                                                   (4 x 7.5 = 30 marks)

11.a)  Derive the condition for transfer of maximum power from a source to a load. (4)

  1. b) A generator develops 200 V and has an internal resistance of 100 Ω. Find the
    power delivered to a load of 100 Ω. What is the efficiency?  (3.5)
  2. With a neat diagram, explain the construction and working of a phase shift oscillator.
  3. Derive expressions for the gain of inverting and non-inverting amplifiers using Op-
    Amp.                                                                                                                                             (3+4.5)

 

  1. Draw the logic circuit of a Master- Slave flip-flop and explain its working. How is the
    race around problem overcome?
  2. Explain with theory, the working of MOD7 asynchronous UP counter.

PART – C

Answer ANY FOUR questions.                                                                                 (4 x 12.5 = 50 marks)

  1. Give the equivalent circuit of a CE amplifier using h- parameters. Hence derive expressions for Ai, Av and Zi in terms of h-parameters.   (4+8.5)
  2. a) Explain the construction and working of Bistable Multivibrator with a neat diagram.
  3. b) A  potential divider circuit has the following values. IE = 2mA, IB = 50 µA , VBE =
    2 V, RE= 1 k and R2 = 10 k and VCC = 10V. Find the value of R1.                                                  (8+4.5)
  4. a) Explain the working of averaging amplifier using Op-Amp.
  5. b) Solve the given simultaneous equations using Op-Amps.

2  X  +   3Y =  14  and  2 X  – Y  = 4                                                                                       (5+7.5)

  1. Simplify the Boolean function

F(A,B,C,D)   =  Σm (  1,3,7,11,15)  + Σd  (0,2,5 )

Implement the simplified expression as a logic diagram with only two input NAND
gates only.                                                                                                                                     (6+6.5)

  1. Write detailed notes on:
  2. a) Shift registers b) Read Only Memory and     c) Random Access Memory.            (4.5+4+4)

 

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Loyola College B.Sc. Physics April 2012 Electronics – I Question Paper PDF Download

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – APRIL 2012

PH 3504/PH 3502/PH 5501 – ELECTRONICS – I

 

 

 

Date : 24-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART –A                                                      

Answer all questions:                                                                                                            (10 x 2 = 20)

 

  1. A DC source generating 500 V has an internal resistance of 1000 Ω. Find the load current if load resistance is 50 Ω and 100 Ω.
  2. State the condition for transfer of maximum power from a source to load.
  3. What is the need for biasing a transistor?
  4. What is a multivibrator?
  5. Define CMRR.
  6. Give the basic construction of UJT.
  7. Give the block diagram of a multiplexer.
  8. Draw the logic symbol and truth table for T flip flop.
  9. What is a shift register?
  10. Write a brief note on RAM.

 

PART – B     

 

Answer any FOUR questions:                                                                                   (4 x 7.5 = 30 marks)

 

  1. Use the principle of superposition to find the current in the 4 Ω resistor in the circuit given below:

 

 

 

 

  1. Discuss the working of RC coupled amplifier with a neat circuit diagram.
  2. Explain how op-amp can be used as a summing and difference amplifier.
  3. Discuss the construction and working of 4 bit a parallel binary adder.
  4. Design the logic circuit for 3 bit down counter and explain its working with the help of truth table.

 

PART – C     

 

Answer any FOUR questions:                                                                                   (4 x 12.5 = 50 marks)

 

  1. Obtain the general expression for input impedance, current gain and voltage gain of a transistor in terms of h parameters and load resistance. Deduce the same for a transistor used in CE mode.
  2. a) Explain the principle of phase shift oscillator and describe its working with a neat

diagram.

  1. b) Describe the working of bistable multivibrator. (7 + 5.5)
  2. Describe the construction and working of SCR. Also explain how it can be used as an half wave rectifier.
  3. With a neat circuit diagram and truth table describe the operation of a J-K Master Slave flip flop.
  4. Discuss the working of a bi-directional shift register with a neat block diagram.

 

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2012

PH 5404/5401 – ELECTRONICS – II

 

 

Date : 27-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer ALL questions                                                                                              (10×2=20)

  1. Write a short note on logarithmic amplifier.
  2. Calculate the cut off frequency for a second order high pass filter given R2 =10 kΩ,
    R3 =10 kΩ, C2= 1µF, C3 =1µF, R1 = 20kΩ, R2=10kΩ.
  3. Differentiate analog and digital signals
  4. What is meant by accuracy in a D/A converter?
  5. What is meant by etching in IC terminology?
  6. What is VLSI?
  7. What is PSW?
  8. State the difference between ADD and ADC instructions of 8085.
  9. Define opcode and operand.
  10. Write a program to add 05 and 04 by immediate mode of addressing in microprocessor 8085.

 

PART – B

Answer any FOUR questions                                                                                                (4×7.5 = 30)

  1. Solve the following differential equation using operational amplifiers. d2y/dt2 2dy/dt+3y–1=0.
  2. Explain with circuit the working of OP-AMP based integrator.
  3. Discuss with a neat diagram the working of a counter type A/D converter.
  4. What is addressing? Explain in detail about the different addressing modes in µP 8085.
  5. Write an assembly language program to determine the smallest number in an array of 10 numbers.

 

PART – C

Answer any FOUR questions                                                                                                (4×12.5 =50)

  1. With a neat diagram explain in detail the working of an OP-AMP based monostable multivibrator. Obtain the expression of the pulse width.
  2. (a) Explain with circuit, the working of a 4 bit binary weighted D/A converter with OP-AMP      (6.5)

(b) For a 4 bit binary weighted resistor D/A converter determine the following (i) output voltage when MSB is set. (ii) Output voltage for 1011 (iii) Full scale voltage. Assume 0=0V and 1=5V. Rf=R/8   (6)

  1. (a) Discuss in detail the fabrication of resistor. (6.5)

(b) Write short notes on linear and non-linear integrated circuits.                       (6)

  1. Explain in detail about the classification of instruction sets in microprocessor 8085.
  2. Write an assembly language program to evaluate the expression x2+xy+y2 using subroutine.

 

 

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Loyola College B.Sc. Physics Nov 2012 Electronics – I Question Paper PDF Download

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc., DEGREE EXAMINATION – PHYSICS

THIRD SEMESTER – NOVEMBER 2012

 PH 3504/3502/5501- ELCTRONICS – I

 

 

 

Date : 02-11-2012              Dept. No.                                        Max. : 100 Marks

Time : 9.00 – 12.00

 

PART – A

Answer All Questions:                                                                                              (10 X 2 = 20 MARKS)

 

  1. State Norton’s Theorem.
  2. What is the characteristic feature of a linear network?
  3. Define bandwidth of an amplifier.

 

  1. Mention the different techniques adopted for coupling of amplifier stages.
  2. Define CMRR and express it in decibels.
  3. State two applications of UJT.
  4. What is a demultiplexer?

 

  1. Draw the logic symbol and write the truth table of a D flip-flop.

 

  1. State any two significant differences between ROM and RAM.

 

  1. How many flip-flops are required to construct a MOD-128 counter and what is the largest decimal number that can be stored in a MOD-64 counter?

 

PART – B

 

Answer ANY FOUR Questions:                                                                  (4 x 7.5 = 30 marks)

 

  1. State superposition theorem and use it to find the current through R1 in the following circuit were V2=10V; V1=5V; R1=1Ω; R2= 3Ω; R3=2Ω.                                                              (1.5+6)
  2. With a neat diagram explain in detail the working of a Monostable Multivibrator.                   (7.5)

 

  1. Explain the working of a summing amplifier. How can it be wired to provide an output voltage that is equal to the difference of two input voltages?                                                              (5+2.5)

 

  1. Simplify into sum of products F (A, B, C, D) = Σ (1, 3, 4, 5, 6, 7, 9, 12, 13) using K-map and draw the logic circuit for the simplified expression.                                                 (6+1.5)

 

  1. Explain with the logic diagram how data can be shifted serially into and received in a parallel manner in an 8-bit shift register.                                     (7.5)

 

PART C

 

Answer ANY FOUR questions :                                                                              (4 x 12.5 = 50 marks)

 

  1. Obtain expressions for Ai, Av and Zi interms of ‘h’ parameters for a transistor amplifier connected in common emitter configuration with necessary equivalent circuit.              (9+3.5)

 

  1. (a) Explain with a neat circuit the functioning of a phase shift oscillator.

(b) If the values of resistances R1, R2 & R3 is 1MΩ and capacitors C1, C2 and C3 is

68pF, at what frequency will the circuit oscillate.                                                            (10+2.5)

 

  1. Describe the working of an n-channel FET with a properly biased circuit. Plot and explain the drain and transfer characteristics for the same.                                              (6.5+3+3)

 

  1. (a) Design using logic gates a 16 to 1 multiplexer and explain its functioning.

(b) Explain the working of a JK master slave flip flop with the logic diagram and truth

table.                                                                                                                                    (6+6.5)

 

  1. With a neat circuit explain the working of a MOD-5 counter. How can it be modified to function as a decade counter?                                                 (6+6.5)

 

 

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