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

Basic Electronics - Jun 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)

Choose an appropriate option from the following. 1 (a) 1 The frequency that has the longest period is
(a) 10 KHz
(b)1 KHz
(c)10 Hz
(d)1 Hz.
(1 marks)
1 (a) 2 Ohm's law (V = IR)
(a) Can be applied to a.c similar to that of d.c.
(b)Can be applied to a.c. but after replacing R by Z (impedance)
(c)Can never be applied to a.c
(d)None of the above.
(1 marks)
1 (a) 3 The difference in period of two frequencies of 1MHz and 2 MHz is
(a) 0.5 milli-second
(b)0.5 micro-second
(c)1 milli-second
(d)1 micro-second.
(1 marks)
1 (a) 4 Conductance is expressed in terms of
(a) ohm / m (b) m / ohm (c) mho / m
(d)mho.
(1 marks)
1 (a) 5 Which resistor will be physically larger in size ?
(a)10 ohm, 50 W
(b)100 ohm, 10 W
(c)1 kohm, 1 W
(d)10 Mohm, 1/ 2 W.
(1 marks)
1 (a) 6 The output of a logic gate is '1' when all its input are at logic 0.The gate is either
(a) NAND or an EX OR gate (b) NOR or an EX-NOR gate
(c)an OR or an EX NOR gate (d) an AND or an EX-OR gate.
(1 marks)
1 (a) 7 Out of following signals __________ is an even signal.
(a) Cosine wave
(b)Sine wave
(c)Triangle wave
(d)None of the above.
(1 marks)

Choose an appropriate option from the following.

1 (b) 1 The circuit which magnifies a small input signal without changing its shape is called an ____________<br. (a)="" linear="" amplifier<br="">(b)Power Amplifier
(c)Non-linear Amplifier (d) None of Above.</br.&gt;<>(1 marks)
1 (b) 2 IC741 use a ________ polarity supply.
(a) Dual
(b)Single
(c)Negative (d) None of Above.
(1 marks)
1 (b) 3 Minimum bandwidth of an AM wave is ________.
(a) fm
(b)2fm
(c)0.5fm
(d)4fm.
(1 marks)
1 (b) 4 PCM is a _________Pulse Modulation Technique.
(a) Analog
(b)Digital (c) Hybrid
(d)None of Above.
(1 marks)
1 (b) 5 The first cellular systems were ___________.
(a) Analog
(b)Digital
(c)Hybrid
(d)None of Above.
(1 marks)
1 (b) 6 A feedback control system is also called a___________.,br> (a) Recursive system (b) Linear System.
(c)Open loop system (d) Closed loop system.
(1 marks)
1 (b) 7 CPU communicates with the outside world through the ________.
(a) Memory (b) I/O devices (c) ALU (d) None of Above.
(1 marks)
2 (a) Define The following Terms.
(a) Interference (b) Mutual Inductance (c) Noise Margin.
(3 marks)
2 (b) Write a short note on Cathode Ray Oscilloscope.(4 marks) 2 (c) Find the voltage Vx using superposition theorem. All resistor values are in ohm.

(7 marks) 3 (a) Draw circuit diagram of non-inverting operational amplifier & explain in brief.(3 marks) 3 (b) Explain DELTA-WYE transformation in brief with necessary equations and circuit Diagrams.(4 marks) 3 (c) Describe low pass active filter using Operational amplifier with necessary diagrams and equations.(7 marks) 4 (a) What is difference between in Microprocessor and Microcontroller?(3 marks) 4 (b) What do you understand about multiplexing? Explain any one of the Multiplexing Technique.(4 marks) 4 (c) Draw & Explain the functional description of digital communication system in Brief.(7 marks) 5 (a) Reduce the given function using K-map, F=Σm(1,3,5,9,11,13).(3 marks) 5 (b) Write Short note on D flip flop with circuit diagram and truth table.(4 marks) 5 (c) Classify the types of Computer network? Explain each one of them in brief.(7 marks) 6 (a) What do you understand about isotropic radiator?(3 marks) 6 (b) Classify the standard based on 2G & 3G.(4 marks) 6 (c) What do you understand about frequency reuse concept & Why it is used in cellular system?(7 marks) 7 (a) Classify the Control systems.(3 marks) 7 (b) Compare Open loop and Close loop System.(4 marks) 7 (c) Compare DSB-FC, DSB-SC, SSB, VSB.(7 marks)

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