loading......

coming soon

Coming Soon

We are in process of building the inventory of good professionals in this category

Got it!

Where do you need ?

location

Please select a Location.

Ask an Electronics & Communication(GATE Coaching classes) Question

Get your questions answered by Electronics & Communication(GATE Coaching classes) Professionals.

+ Follow 8 Followers

Top Contributors

Sarvajeet

202 Answers

Prasanth Kumar

100 Answers

Kavitha

87 Answers

Ankit

75 Answers

Tapas

64 Answers

Shikha

63 Answers

Ranganath

56 Answers

Srinivas

48 Answers

Raghavendra

45 Answers

Thousands of experts Tutors, Trainers & other Professionals are available to answer your questions

Showing 1 to 25 of 101
Sort By: 
M

Show previous answers

Pradeep replied | 15/12/2016

Speed= (8+6+16)/(3/4)= 30*4/3 = 40 km/h.

0 0

Sunil replied | 15/12/2016

Avg Speed = Total Distance/Total Time
=> (8+6+16)/(0.25+0.25+0.25) =40 kmph.

0 0

Answer

You can add upto 6 Images

S

Sheekha 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the overall impulse response of the cascaded system if the two systems with impulse h1(t) and h2(t) are connected in cascade?

0 0 4

Show previous answers

Arindam replied | 04/12/2016

h1(t) * h2(t).

0 0

Rishabh replied | 08/12/2016

In time domain,
h1(t)*h2(t).
In s domain,
H1(s).H2(s).

0 0

Answer

You can add upto 6 Images

V

Vikas 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the fundamental frequency in rad/s for a periodic signal v(t) = 30 sin 100t + 10 cos 300t + 6 sin(500t + pie / 4)?

0 0 3

Show previous answers

Sathyaprakash replied | 02/12/2016

100 rad/s.

0 0

Rishabh replied | 08/12/2016

LCM of 100, 300 & 500 which is 1500.
No effect of phase shift pie/4.

0 0

Answer

You can add upto 6 Images

V

Veerendra 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

In a huge pile of apples and oranges, both ripe and unripe mixed together, 15% are unripe fruits. Of the unripe fruits, 45% are apples. Of the ripe ones, 66% are oranges. If the pile contains a total of 59620 fruits, how many of them are apples?

0 0 3

Show previous answers

Rishabh replied | 09/12/2016

59620*0.15*0.45 + 59620*(1-0.66)*0.85.

0 0

Santosh replied | 13/12/2016

21254

0 0

Answer

You can add upto 6 Images

P

Palak 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the eligibility criteria for appearing GATE exam?

0 0 3

Show previous answers

Sunil replied | 14/12/2016

(B.Tech)Engineering degree or BCA+MCA.

0 0

M Balal replied | 15/12/2016

Graduation in Engineering or Concern Subjects.

0 0

Answer

You can add upto 6 Images

A

Ananya 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What do you mean by impedance?

0 0 4

Show previous answers

Sourav Kumar Singh replied | 05/12/2016

Impedance is a vector (two-dimensional)quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance.

0 0

Sourav Kumar Singh replied | 05/12/2016

Resistance is a measure of the extent to which a substance opposes the movement of electrons among its atoms.The more easily the atoms give up and/or accept electrons, the lower the resistance, which is expressed in positive real number ohms.
Reactance, denoted X, is an expression of the extent to which an electronic component, circuit, or system stores and releases energy as...  more»
Resistance is a measure of the extent to which a substance opposes the movement of electrons among its atoms.The more easily the atoms give up and/or accept electrons, the lower the resistance, which is expressed in positive real number ohms.
Reactance, denoted X, is an expression of the extent to which an electronic component, circuit, or system stores and releases energy as the current and voltage fluctuate with each AC cycle. Reactance is expressed in imaginary number ohms.It is observed for AC, but not for DC.When AC passes through a component that contains reactance, energy might be stored and released in the form of a magnetic field, in which case the reactance is inductive (denoted +jXL); or energy might be stored and released in the form of an electric field, in which case the reactance is capacitive (denoted -jXC). Reactance is conventionally multiplied by the positive square root of -1, which is the unit imaginary number called the j operator, to express Z as a complex number of the form R + jXL (when the net reactance is inductive) or R - jXC (when the net reactance is capacitive). «less

0 0

Answer

You can add upto 6 Images

T

Thinagaran 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is discrete signal?

0 0 3

Show previous answers

Sunil replied | 14/12/2016

It is a time series that is a function over a domain of integers. Unlike a continuous-time signal, a discrete-time signal is not a function of a continuous argument.

0 0

M Balal replied | 15/12/2016

In a discrete-time signal, the number of elements in the set, as well as the possible values of each element, is finite, countable, and can be represented with computer bits, and stored on a digital storage medium.

0 0

Answer

You can add upto 6 Images

M

Manish 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Place an appropriate phrase: Frogs ________ ?

0 0 3

Show previous answers

Chetan Gandhi replied | 03/12/2016

Croak.

0 0

Sourav Kumar Singh replied | 05/12/2016

are afraid of snakes.

0 0

Answer

You can add upto 6 Images

P

Pradeep 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the characteristics of pn junction?

0 0 3

Show previous answers

S

Srujan replied | 15/12/2016

Pn junction has p- type and n-type two substrates connected forming a depletion layer because the majority carriers in them are different. It is used as a diode as forward biased or reverse biased.

0 0

Arindam replied | 15/12/2016

It has rectifying capability. It provide very low resistance for current in one direction and restrict flow of current in the opposite direction.

0 0

Answer

You can add upto 6 Images

M

Madhavan 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

A region of negative differential resistance is observed in the current voltage characteristics of a silicon pn junction if____________ ?

0 0 3

Show previous answers

Shantanu replied | 22/11/2016

Both the P-region and the N-region are heavily doped.

0 0

Sukhwinder replied | 27/11/2016

Both the p-region and n-region are heavily doped.

0 0

Answer

You can add upto 6 Images

K

Kartheek 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the value of k for which the system has infinitely many solution:
x + 2 y + 3 z = - 1
x + 3 y + 4 z = 1 and
2 x + 4 y + 6 z = k?

0 0 3

Show previous answers

Pradeep replied | 15/12/2016

-2.

0 0

Kishore replied | 15/12/2016

k= - 2.

0 0

Answer

You can add upto 6 Images

R

Rajesh 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the difference between the low - pass signal and band - pass signal?

0 0 4

Show previous answers

Reneeta replied | 27/11/2016

A low pass signal is a signal which has lower frequency very close to zero or zero. The signal can have a maximum frequency (f) till which the frequency spectrum extends. A band pass signal consists of a frequency band in which the lower frequency is much higher than zero frequency.

0 0

M replied | 28/11/2016

Signal with low frequency that pass through low pass filter and signal with medium frequency that pass through band pass filter.

0 0

Answer

You can add upto 6 Images

M

Murugan 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned OFF by any one of the switches irrespective of the state of the other switch. Then what is the logic of switching of the bulb resembles?

0 0

Santosh replied | 13/12/2016

X -NOR.

0 0

Answer

You can add upto 6 Images

P

Pankaj 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

In a forward biased pn junction diode, the sequence of events that best describes the mechanisms of current flow is____?

0 0

Sukhwinder replied | 24/11/2016

Injection and subsequent diffusion and recombination of minority carriers.

0 0

Answer

You can add upto 6 Images

M

Mridulika 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What type of gas produced when the IC technology, dry oxidation as compared to wet oxidation?

0 0

Vikas replied | 30/11/2016

In dry oxidation no gas is produced.
In Wet Oxidation Hydrogen gas is produced.
Wet Oxidation:-
It is a form of hydro thermal reaction. The oxidation is done by involving the dissolved components in H2O with oxygen as a oxidizer.
The chemical reaction is:
Si + 2 H2O -> SiO2 + 2H2
Dry Oxidation:-
Dry oxidation has lower growth rate than wet oxidation,...  more»
In dry oxidation no gas is produced.
In Wet Oxidation Hydrogen gas is produced.
Wet Oxidation:-
It is a form of hydro thermal reaction. The oxidation is done by involving the dissolved components in H2O with oxygen as a oxidizer.
The chemical reaction is:
Si + 2 H2O -> SiO2 + 2H2
Dry Oxidation:-
Dry oxidation has lower growth rate than wet oxidation, although the oxide film quality is better.
The chemical reaction for Silicon and Oxygen is:-
Si + O2 -> SiO2. «less

0 0

Answer

You can add upto 6 Images

T

Test 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What do you mean by divergence of vector?

0 0

Vikas replied | 09/12/2016

In vector calculus, divergence is a vector operator that produces a signed scalar field giving the quantity of a vector field's source at each point. More technically, the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point.
As an example, consider air as it is heated or cooled. The velocity of the...  more»
In vector calculus, divergence is a vector operator that produces a signed scalar field giving the quantity of a vector field's source at each point. More technically, the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point.
As an example, consider air as it is heated or cooled. The velocity of the air at each point defines a vector field. While air is heated in a region, it expands in all directions, and thus the velocity field points outward from that region. The divergence of the velocity field in that region would thus have a positive value. While the air is cooled and thus contracting, the divergence of the velocity has a negative value.
In physical terms, the divergence of a three-dimensional vector field is the extent to which the vector field flow behaves like a source at a given point. It is a local measure of its "out goingness"– the extent to which there is more exiting an infinitesimal region of space than entering it. If the divergence is nonzero at some point then there must be a source or sink at that position. «less

0 0

Santosh replied | 13/12/2016

Divergence of vector indicates how much resultant vector quantity diverges or converges a given volume. For example water flowing in a pipe per cubic centimeter is the best example of divergence.

0 0

Answer

You can add upto 6 Images

M

Meenakshisundarams 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the sampling frequency if a band limited with a maximum frequency of 5kHz is to be sampled?

0 0

Sushil replied | 25/11/2016

2*5 kHz = 10 kHz.

0 0

Answer

You can add upto 6 Images

K

K 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

How many roots does a polynomial has: f(x) = a2 (square of x) + a0 with all positive coefficients?

0 0

Rishabh replied | 08/12/2016

Both roots have imaginary coefficient.
One is positive, other is negative.

0 0

Answer

You can add upto 6 Images

A

Ashwin 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the value of accumulator at the end of program for 8085 microprocessor if the program is executed:
MVI A, 05H;
MVI B, 05H;
PTR: ADD B;
DCR B;
JNZ PTR;
ADI03H;
HLT;?

0 0

Sushil replied | 22/11/2016

17H

0 0

Answer

You can add upto 6 Images

M

Ms 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the value of fundamental frequency in rad/sec, for a periodic signal: v(t) = 30 sin 100t + 10 cos 300 t + 6 sin (500 t + pie / 4)?

0 0

Santosh replied | 13/12/2016

100 rad/sec.

0 0

Answer

You can add upto 6 Images

A

Alifiya 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the minimum bandwidth required for ISI free transmission if the modulation used is 32 QAM?

0 0

Sushil replied | 22/11/2016

2 * 5* 4 = 40Kbps

0 0

Sukhwinder replied | 27/11/2016

0
down vote
favorite
1
If the bit rate of the digital communication system is 'R' Kbps & the modulation used is 32-QAM, what is the minimum bandwidth required for ISI free transmission?
My understanding & analysis so far:
QAM (a digital-to-analog conversion technique) is a combination of ASK & PSK. The idea behind QAM is to alter two characteristics (amplitude...  more»
0
down vote
favorite
1
If the bit rate of the digital communication system is 'R' Kbps & the modulation used is 32-QAM, what is the minimum bandwidth required for ISI free transmission?
My understanding & analysis so far:
QAM (a digital-to-analog conversion technique) is a combination of ASK & PSK. The idea behind QAM is to alter two characteristics (amplitude & phase) instead of just one to improve the bit rate.
From literature (Data Communications & Networking by Forouzan), the minimum bandwidth required for QAM is same as that of ASK/PSK.
BW for Binary ASK is given by B = (1+d)S, where S is the signal rate.
For 32-QAM bandwidth is:-
B = S = (bit rate)/(bits per signal element) = R/5 KHz
(for 32-QAM no. of symbols per signal element is log2(32) = 5) «less

0 0

Answer

You can add upto 6 Images

A

Ankan 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What do you mean by LTI system?

0 0
G

Gateforum replied | 08/12/2016

Linear time-invariant theory, commonly known as LTI system theory, comes from applied mathematics and has direct applications in NMR spectroscopy, seismology, circuits, signal processing, control theory, and other technical areas.

0 0

Answer

You can add upto 6 Images

R

Rayyan 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

A band limited signal with a maximum frequency of 5kHZ is to be sampled. Then what is the value of sampling frequency?

0 0

Sathyaprakash replied | 01/12/2016

More than 10 kHz.

0 0

Answer

You can add upto 6 Images

A

Affaan 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Define Laplace transform?

0 0

Vikas replied | 02/12/2016

The Laplace transform is an integral transform named after its discoverer Pierre-Simon Laplace.
It takes a function of a positive real variable t (often time) to a function of a complex variable s (frequency).
While the Fourier transform of a function is a complex function of a real variable (frequency), the Laplace transform of a function is a complex function of a complex...  more»
The Laplace transform is an integral transform named after its discoverer Pierre-Simon Laplace.
It takes a function of a positive real variable t (often time) to a function of a complex variable s (frequency).
While the Fourier transform of a function is a complex function of a real variable (frequency), the Laplace transform of a function is a complex function of a complex variable. Laplace transforms are usually restricted to functions of t with t > 0. A consequence of this restriction is that the Laplace transform of a function is a holomorphic function of the variable s. Unlike the Fourier transform, the Laplace transform of a distribution is generally a well-behaved function. Also techniques of complex variables can be used directly to study Laplace transforms. As a holomorphic function, the Laplace transform has a power series representation. This power series expresses a function as a linear superposition of moments of the function. This perspective has applications in probability theory. «less

0 0

Vikas replied | 02/12/2016

The Laplace transform is an integral transform named after its discoverer Pierre-Simon Laplace.
It takes a function of a positive real variable t (often time) to a function of a complex variable s (frequency).
While the Fourier transform of a function is a complex function of a real variable (frequency), the Laplace transform of a function is a complex function of a complex...  more»
The Laplace transform is an integral transform named after its discoverer Pierre-Simon Laplace.
It takes a function of a positive real variable t (often time) to a function of a complex variable s (frequency).
While the Fourier transform of a function is a complex function of a real variable (frequency), the Laplace transform of a function is a complex function of a complex variable. Laplace transforms are usually restricted to functions of t with t > 0. A consequence of this restriction is that the Laplace transform of a function is a holomorphic function of the variable s. Unlike the Fourier transform, the Laplace transform of a distribution is generally a well-behaved function. Also techniques of complex variables can be used directly to study Laplace transforms. As a holomorphic function, the Laplace transform has a power series representation. This power series expresses a function as a linear superposition of moments of the function. This perspective has applications in probability theory.
The Laplace transform is invertible on a large class of functions. The inverse Laplace transform takes a function of a complex variable s (often frequency) and yields a function of a real variable t (time). Given a simple mathematical or functional description of an input or output to a system, the Laplace transform provides an alternative functional description that often simplifies the process of analyzing the behavior of the system, or in synthesizing a new system based on a set of specifications. So, for example, Laplace transformation from the time domain to the frequency domain transforms differential equations into algebraic equations and convolution into multiplication.
The Laplace transform is particularly useful in solving linear ordinary differential equations such as those arising in the analysis of electronic circuits. «less

0 0

Answer

You can add upto 6 Images

P

Priyanka 19/11/2016 in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the chance that a leap year, selected at random, will contain 53 Saturdays?

0 0

Vikas replied | 02/12/2016

A leap year has 366 days = 52 weeks ( 52x7 days) + 2 days = 364 + 2 = 366 Days
So, we are looking for either of these extra 2 days being Saturday.
We have 7 week days , we have 2 extra days in leap year over 52 weeks.
Thus probability that any day of the week is Saturday is 1/7
Here we have 2 Extra days ==> Total Probability = 1/7 + 1/7 = 2/7
Hence the chance...  more»
A leap year has 366 days = 52 weeks ( 52x7 days) + 2 days = 364 + 2 = 366 Days
So, we are looking for either of these extra 2 days being Saturday.
We have 7 week days , we have 2 extra days in leap year over 52 weeks.
Thus probability that any day of the week is Saturday is 1/7
Here we have 2 Extra days ==> Total Probability = 1/7 + 1/7 = 2/7
Hence the chance that a leap year selected at random will contain 53 Saturdays is 2/7. «less

0 0

Answer

You can add upto 6 Images

12345Next

Find Best GATE Coaching classes?

Find Now »