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Basic Electronics : Question Paper Dec 2015 - First Year Engineering (Semester 2) | Gujarat Technological University (GTU)

## Basic Electronics - Dec 2015

### First Year Engineering (Semester 2)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

### Objective Question (MCQ)

1(a)1 Which component has a positive and a negative side?
(a) A potentiometer
(b) A fuse
(c) A resistor
(d) A battery
(1 marks)
1(a)2 To increase the current capacity of a cell, several cells should be connected in:
(a) parallel
(b) series
(c) parallel resonant
(d) series resonant
(1 marks)
1(a)3 Which tolerance rating would a high-quality resistor have?
(a) 5%
(b) 10%
(c) 20%
(d) 0.1%
(1 marks)
1(a)4 What does a common multimeter measure?
(a) Resistance, capacitance and inductance
(b) Voltage, current and resistance
(c) Resistance and reactance
(d) SWR and power
(1 marks)
1(a)5 Potential difference is measured by means of:
(a) a wattmeter
(b) an ohmmeter
(c) a voltmeter
(d) an ammeter
(1 marks)
1(a)6 A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much:
(a) voltage
(b) resistance
(c) current
(d) power
(1 marks)
1(a)7 In most of modern IC op-amps, the 741 requires ______ power supplies
(a) 1
(b) 2
(c) 3
(d) 4
(1 marks)

### Objective Question (MCQ)

1(b)1 Electrical energy at a frequency of 1454 Hz is in what frequency range?
(b) Audio
(c) High
(d) Super-high
(1 marks)
1(b)2 A circuit designed to increase the level of its input signal is called:
(a) an amplifier
(b) a modulator
(c) an oscillator
(1 marks)
1(b)3 In a frequency modulation receiver, the ______ is in between the antenna and the mixer.
(a) audio frequency amplifier
(b) high frequency oscillator
(c) intermediate frequency amplifier
(1 marks)
1(b)4 All arithmetic operation take place in the ______ of a computer
(a) CPU
(b) ALU
(c) ROM
(d)Microprocessor
(1 marks)
1(b)5 The logic gate which detects equality of two bits is
(a) EX-OR
(b) EX-NOR
(c) NOR
(d) NAND
(1 marks)
1(b)6 The basic building block for a logical circuit is ______
(a) A flip flop
(b) A logical gate
(d) None of the above
(1 marks)
1(b)7 A control system in which the control action is somehow dependent on the output is known as
(a) closed loop System
(b) semi closed loop system
(c) open system
(d) None of the above
(1 marks)
2(a) Explain in brief about Dot Convention.(3 marks) 2(b) Write a short note on Oscilloscope.(4 marks) 2(c) For the circuit shown in following figure, use the superposition theorem to find io :!MAGE.(7 marks) 3(a) Classify the controlled source and draw schematics for each.(3 marks) 3(b) Explain in brief following properties of operational amplifier.
(a) Input Resistance
(b) Open Loop Voltage gain
(c) CMRR
(d) Input Offset Voltage
(4 marks)
3(c) Write about ideal operational amplifier with necessary circuit diagram and equations.(7 marks) 4(a) Why differential amplifier is necessary?(3 marks) 4(b) Obtain a minimum Boolean expression for F(A,B,C,D) = ∑ mi ((1, 3, 4, 5, 6, 7, 10, 12)(4 marks) 4(c) For the logic expression Z = A B+A B
(i) Obtain the truth table.
(ii) Name the operation performed <>br (iii) Realize this operation using AND, OR, NOT gates
(iv) Realize Same operation using only NAND gates
(7 marks)
5(a) Classify display devices.(3 marks) 5(b) Classify network topologies and draw each one of them.(4 marks) 5(c) Draw and explain microprocessor system architecture(7 marks) 6(a) Draw block diagram of Pulse code Modulation.(3 marks) 6(b) Explain in brief cellular concept in mobile radio system.(4 marks) 6(c) State the need of modulation and what are the other advantages of modulation in communication system?(7 marks) 7(a) Define the following terms:
(a) Reflection
(b) Directivity
(3 marks)
7(b) What is transmission medium? What are the different types of transmission medium?(4 marks) 7(c) Explain digital control system with necessary block diagrams.(7 marks)