SIGNALS AND SYSTEMS

SIGNALS AND SYSTEMS 1.      All the signals are basically Vectors 2.      A vector can be represented in terms of its co-ordinates 3.      A signal is said to be periodic if it repeats at regular intervals 4.      The condition for periodicity of continuous time signal is x(t)=x(t+T0) 5.      Trigonometric Fourier series can be represented in Compact Form 6.      Single Valued Property must have...

Read More

Antenna Wave Propagation

Antenna Wave Propagation       1.      A communication system always involves a Spectrum or Band of Frequencies       2.      Modulation may be defined as a process by which any characteristics of a wave is varied as a function       3.      To radiate or receive electromagnetic waves an Antenna is required4.      The boundary sphere between antenna region and free space region appears as opaque5.      Electric...

Read More

MICROWAVE ENGINEERING

MICROWAVE ENGINEERING 1.      Microwaves have large band widths compared to common bands 2.      Fading effect due to variation in the transmission medium is more effective at low frequencies 3.      EM waves are oscillations that propagate through free space 4.      The TEM waves are propagated equally in all directions if the source is a point source 5.      Series junction is also known as E-Plane TEE 6.      The...

Read More

DSP Lab - SAMPLE viva questions

DSP Lab - SAMPLE viva questions 1.What is MATLAB? 2.What are the applications of MATLAB? 3.State sampling theorem. 4.What is meant by Nyquist rate and Nyquist criteria? 5.Explain scaling and superposition properties of a system. 6.What is meant by linearity of a system and how it is related to scaling and superposition? 7.What is impulse function? 8.What is meant by impulse response? 9.What is energy signal? How to calculate energy of a signal? 10.What is power signal? How to calculate power of a signal? 11.Differentiate between even and odd...

Read More

PULSE AND DIGITAL CIRCUITS

PULSE AND DIGITAL CIRCUITS 1.      The capacitor which totally blocks D.C not allowing it to reach output is called Blocking Capacitor 2.      The magnitude of the ratio of output to input called Transfer Function 3.      The average level of the output signal is always zero, under Steady State 4.      Critical Resistance  is the value of  resistance which reduces square root term to zero 5.      Damping Ratio...

Read More

SWITCHING THEORY AND LOGIC DESIGNING

SWITCHING THEORY AND LOGIC DESIGNING 1.      Numeric codes used to represent decimal digits are called BCD codes 2.      Each 4 bit binary group is called a Nibble 3.      The consenus theorem is also called Included Factor theorem 4.      A bubbled AND gate is equivalent to a NOR gate 5.      A 16 square eliminates four square 6.      Sub cubes in the K-map from either Square or Rectangles 7.     ...

Read More

MICROWAVE ENGINEERING

MICROWAVE ENGINEERING 1.      Microwaves have large band widths compared to common bands 2.      Fading effect due to variation in the transmission medium is more effective at low frequencies 3.      EM waves are oscillations that propagate through free space 4.      The TEM waves are propagated equally in all directions if the source is a point source 5.      Series junction is also known as E-Plane TEE 6.      The...

Read More

DIGITAL COMMUNICATION

DIGITAL COMMUNICATION 1.      The codes developed during the four decades after hamming were definitely achieving practically Error-Free communication 2.      The information sources most of in the nature are analog in nature 3.      The communication channel has a finite Band Width 4.      Geometric representation of signals, which greatly simplifies Signal Detection process 5.      Channels such as under water acoustic...

Read More

ELECTRONIC DEVICES AND CIRCUITS

ELECTRONIC DEVICES AND CIRCUITS 1.      Valence Electrons are the electrons present in the outermost orbit2.      The element that does not have three valence electrons is Gallium3.      The ripple frequency for a full wave rectifier is twice the supply frequency4.      The primary function of a rectifier filter is to Removes Ripples5.      Power transistors are invariably provided with Heat Sink6.     ...

Read More

ANTENNA & WAVE PROPAGATION

ANTENNA & WAVE PROPAGATION 1. The process of transmitting electromagnetic waves into space is known as radiation. 2. Capacitance of a parallel plate capacitor is C=EA/d farad. 3. The emf induced in a closed circuit due to change of magnetic flux. 4. Radiation intensity defined as power per unit solid angle. 5. Rhombic antenna is used on the principle of travelling wave tube. 6. The average pointing vector of a far field is given by p=1/2R(E*H*). 7. The receiving antenna abstract energy from the passing Electromagnetic field. 8. Optical...

Read More

ELECTRIC CIRCUITS & ANALYSIS

ELECTRIC CIRCUITS & ANALYSIS 1. What is the type of capacitor used in RC coupled amplifier for a) coupling two phases b) by pass emitter    Ans: Generally electrolytic capacitors are used. 2. List out the different types of biasing. Ans: ·         Voltage divider bias ·         Base bias ·         Emitter feed back bias ·         Collector feedback bias  ...

Read More

INTEGRATED CIRCUITS

INTEGRATED CIRCUITS 1.      The counter type is Direct type of ADC. 2.      Subtractors are designed using Adder ICs. 3.      Square wave outputs are generated when the Op-amp is forced to operate in the saturation region. 4.      10 FFs are required to build a binary counter circuit to count from 0 to 1023. 5.      The DACs use level amplifiers to account for variations in logic levels. 6.     ...

Read More