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1 IV SEMESTER FINAL EXAMINATION-2002 The figure in the margin indicates full marks. [i] (110111) 2 = (?) 16 [ii] (788) 10 = (?) 8 Q. [1] [a] Explain the types of extrinsic semiconductors with the help of atomic bonding structure and energy band diagram. [8] [b] What is a diode? Explain its characteristics in forward biased and reverse biased case. [8] Q. [2] [a] What is transistor? Explain the working principle of npn transistor with diagram. [8] [b] Explain the working principle of full wave bridge rectifier with necessary diagram. [8] Q. [3] [a] What are input and output characteristics curve of transistor? Explain input characteristics curve of CE transistor. [8] [b] What is operational amplifier? Find expression of output voltage of inverting and non inverting amplifier. [8] Q. [4] [a] What is modulation? Explain different types of modulation. [6] [b] Write the block diagram of FM radio receiver and explain. [10] Q. [5] [a] What is transducer? Explain primary and secondary transducer. [6] [b] Describe strain gauge and its application. [10] Q. [6] [a] Write the symbol, Boolean expression and truth table of AND, OR, NAND and NOR gates. [8] [b] Perform the following conversion: [8] 1

2 2 IV SEMESTER FINAL EXAMINATION-2003 Q. [1] [a] Describe the importance of electronics in modern society and its application in civil engineering. [8] [b] What are linear and non-linear circuits? Discuss the nobias, forward bias and reverse bias characteristics of a diode with necessary diagram. [8] Q. [2] [a] Explain the working principle of npn transistor. How can you differentiate a BJT from a FET? [8] [b] What is microphone? Explain the working principle of single phase full wave bridge rectifier. Also draw the input and output voltage waveforms. [8] Q. [3] [a] What is operational amplifier? List the ideal characteristics of an Op-Amp. [4] [b] What is an oscillator? Explain the principle of oscillator with a simple circuit. [4] [c] What is modulation? What are their types and why it is needed? Write short notes on antenna. [4+4] Q. [4] [a] Make a bock diagram of AM radio transmitter and explain each block. What is CCTV? [4+2] [b] What is the difference between primary and secondary transducer? Explain the capacitive method of measurement of liquid level with diagram. [2+4] [c] What do you mean by computer networking? Classify the computer networks according to geographical area covered and explain. [4] Q. [5] [a] For what purpose meggers are used? Describe the construction of Cathode Ray Tube with diagram. [1+5] [b] Perform the following conversions: [ ] [c] Design logic circuits of the following Boolean expressions: [2+2+2] [i] (A+B)A B [ii] A(B+C)+CD [iii] ABC+A B C+A BC+ABC Q. [6] [a] What do you mean by LED and LCD? Draw and explain the V-I characteristics of a SCR. [2+4] [b] What are the function of registers? [2] [c] Show and NAND and NOR gates are universal gates.[5] [d] A FET has the following parameters: [3] I DSS = 32mA, V GS (off) = -8v V GS = -4.5V Find the value of drain current.

3 IV SEMESTER FINAL EXAMINATION-2004 Q. [1] [a] Discuss the importance of electronics in civil engineering. Briefly explain the modern means of [b] What is basing? Discuss emitter feedback biasing for a common emitter BJT and discuss its stability compared to fixed bias configuration. [8] Q. [2] [a] Explain the working of an npn-transistor. Derive the expression for gain for non-inverting op-amp. [8] [b] Explain the working of a centre tapped full wave rectifier with input and output voltage wave forms. What should be the PIV rating of the diodes? [6] [c] A resistor has the following color coding. [2] 1 st band :Violet 2 nd band :Green 3 rd band :Brown 4 th band :gold Find the value of resistance of the resistors. Q. [3] [a] Discuss the characteristics, specialties and uses of class A and B amplifier. [6] [b] Differentiate between positive and negative feed back. [2] [c] What is an oscillator and what are its uses. Draw and discuss the working of a simple tuned LC oscillator. [8] Q. [4] [a] What is modulation? Make a block diagram of a FM transmitter and explain each block. [6] [b] Describe briefly the construction of cathode ray tube with neat diagram. [4] [c] What is a voltage regulator? Explain the working of a zener diode shunt voltage regulator. [4] [d] An ammeter having internal resistance of 2 ohm shows full scale deflection when 10mA current flows through it. Show how it can be used to measure the current range of (0-100) ma. [2] Q. [5] [a] Define transducer. Differentiate between primary and secondary transducer. [3] [b] Explain the capacitive method of measuring liquid levels. [4] [c] For what purpose are meggers used. Write short note on digital telemetry. [4] [d] What is compute networking? Classify and explain computer networks according to geographical area covered. [5] Q. [6] [a] Perform the following conversions: [4] [i] ( ) 2 = (?) 16 [ii] (278) 8 = (?) 2 [iii] (159.24) 10 = (?) 2 [iv] (F8C6) 16 = (?) 10 [b] Design logic circuit for the following Boolean expressions: [i] A B+AB [ii] A(B+C )+C(B +A ) [iii] A BC+AB C+ABC +CAB [1+2+3] [c] Explain the process of digital to analog conversion using op-amp summator. [6] 3

4 Q. [1] [a] Why the color code is necessary for a resistor? What is the significance of fourth band? Calculate the value of resistance if it has red color in first band yellow color in second and green color in third band. [2+1+2] [b] What is meant by Avalanche breakdown? [3] [c] Define intrinsic and extrinsic semiconductor. Describe the construction of JFET and mention the function of each terminal. [3+5] Q. [2] [a] Draw the input and output characteristics of common emitter transistor and give the range of input and output resistance. [2+2] [b] Explain the class A operation of transistor amplifier. [4] [c] What do you understand by feedback? Derive an expression for the close loop gain of negative feedback amplifier. [2+6] Q. [3] [a] What is modulation? Why modulation is necessary in communication system? [4+4] [b] What is the purpose of antenna in television? [2] [c] Why computer networking is necessary? Classify it into different category. [3+3] Q. [4] [a] Differenciate between primary and secondary transducers. Describe with neat sketch how the thermal conductivity of gas is measured? [3+5] [b] What are the advantages of magnetic tape recorder over 4 IV SEMESTER BACK-PAPER EXAMINATION-2004 XY-recorder? [4] [c] Why computer networking is necessary? Classify it into different category. [3+3] Q. [4] [a] Differentiate between primary and secondary transducers. Describe with neat sketch how the thermal conductivity of gas is measured? [3+5] [b] What are the advantages of magnetic tape recorder over XY-recorder? [4] [c] Describe the working of megger. [4] Q. [5] [a] Explain how high voltage lines are used as communication channel? [4] [b] What do you mean by LED and LCD? Draw and explain the V-I characteristics of a SCR. [2+4] [c] Describe the R-2R ladder for the conversion of digital signal into analog. [6] Q. [6] [a] Perform the following conversion. [4 1=4] [i] (48) 10 =(?) 2 [ii] ( ) 2 = (?) 16 [iii] (127.24) 8 = (?) 10 [iv] ( ) 2 =(?) 8 [b] Describe the functioning of Rs (or SR) flip-flop with diagram. [4] [c] What are the function of registers? [2] [d] Design logic circuits for the following Boolean expressions. [2+2+2] [i] AB + CD [ii] AB.( A + B)

5 IV SEMESTER BACK PAPER EXAMINATION-2006 Q. [1] [a] Discuss the importance of electronics in civil engineering. Briefly explain the modern means of [b] What is basing? Discuss emitter feedback biasing for a common emitter BJT and discuss its stability compared to fixed bias configuration. [8] Q. [1] [a] Justify the application of Electronics in Civil Engineering. Briefly explain the modern means of [b] Differentiate between BJT and FET. Explain the working principle of n-p-n transistor. [4+4] Q. [2] [a] Explain the V-I characteristics of a pn junction diode. [4] [b] A copper wire has a resistance of 100 ohm. What will happen if the wire is extended so that the length becomes double the diameter reduced to half? [3] [c] Explain the process of full wave rectification with necessary waveforms. [5] i. Optical fiber. ii. Thermal current meter. iii. LCD iv. Half adder. Q. [3] [a] List the characteristics of ideal op-amp. Derive the expression for the closed loop gain of op-amp for noninverting configuration. [2+4] [b] Discuss the characteristics, specialties and uses of class A amplifier. [6] [c] What is a voltage regulator? Explain the voltage regulation using zener diode voltage regulator. [4] Q. [4] [a] What do you mean by modulation? Explain the block diagram of AM transmitter. [2+4] [b] What is antenna? What are its basic parameters. [4] [c] Define transducer. Explain the method of measurement of liquid level by using capacitive transducers. [1+5] Q. [5] [a] What do you mean by computer networking. Explain the type of computer networking according to the geographical area covered. [6] [b] A milliammeter has full scale deflection of 1mA and the meter resistance of 36 ohm. How can the ragne of the milliammeter be extended so as to measure current upto 10mA. [5] [c] Describe the construction of CRT with necessary diagram. [5] Q. [6] [a] Justify the statement NAND and NOR gates are universal gates. [2] [b] Explain the full adder circuit with truth table. [4] [c] Perform the following conversions: [1x4] [i] ( ) 2 =(?) 16 [ii] (124.84) 10 = (?) 2 [iii] (F63A) 16 =(?) 10 [iv] (34576) 8 = (?) 2 [d] Realize logic circuit from the following Boolean expressions: [ ] i. AB(A+B) ii. A(C+B)+BC iii. (A+B+C)(A +B +C ) iv. ABC+A B C+A BC+ABC 5

Scheme I Sample. : Second : Basic. Electronics : 70. Marks. Time: 3 Hrs. 2] b) State any. e) State any. Figure Definition.

Scheme I Sample. : Second : Basic. Electronics : 70. Marks. Time: 3 Hrs. 2] b) State any. e) State any. Figure Definition. Program Name Program Code Semester Course Title Scheme I Sample Question Paper : Diploma in Electronics Program Group : DE/EJ/IE/IS/ET/EN/EX : Second : Basic Electronics : 70 22216 Time: 3 Hrs. Instructions: