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D

Deepak 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Two losses X-band horn antennas are separated by a distance of 200?. The amplitude reflection coefficients at the terminals of the transmitting and receiving antennas are 0.15 and 0.18, respectively. The maximum directivities of the transmitting and receiving antennas (over the isotropic antenna) are 18 dB and 22 dB, respectively. Assuming that the...  more»
Two losses X-band horn antennas are separated by a distance of 200?. The amplitude reflection coefficients at the terminals of the transmitting and receiving antennas are 0.15 and 0.18, respectively. The maximum directivities of the transmitting and receiving antennas (over the isotropic antenna) are 18 dB and 22 dB, respectively. Assuming that the input power in the losses transmission line connected to the antenna is 2 W, and that the antennas are perfectly aligned and polarization matched, the power ( in mW) delivered to the load at the receiver is ________? «less

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Shantanu replied | 29 Nov

3

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Manish 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Place an appropriate phrase: Frogs ________ ?

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Vikas replied | 4 days ago

Frogs falling from the sky , Frogs raining from the sky

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Geet 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

A cube of side 3 units is formed using a set of smaller cubes of side 1 unit. Find the proportion of the number of faces of the smaller cubes visible to those which are NOT visible?

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Vikas replied | 29 Nov

Surface area for 3 Units cube = 6 sides area = 6 x 3^2 = 6 x9 = 54 Units^2.
Surface not visible is basically 4 planes in between the cubes say 2 parallel & 2 orthogonal.
So area of single plane i.e. invisible = 3x3 = 9 Unit^2.
So area of 4 planes invisible = 4 x 9 = 36 Unit^2.
So the Proportion of the Number of Faces visible to Number of faces NOT visible = 54/36...  more»
Surface area for 3 Units cube = 6 sides area = 6 x 3^2 = 6 x9 = 54 Units^2.
Surface not visible is basically 4 planes in between the cubes say 2 parallel & 2 orthogonal.
So area of single plane i.e. invisible = 3x3 = 9 Unit^2.
So area of 4 planes invisible = 4 x 9 = 36 Unit^2.
So the Proportion of the Number of Faces visible to Number of faces NOT visible = 54/36 = 6/4 = 1.5.
The answer is 1.5 or Proportion is 3:2. «less

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Awdhesh 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Define polar plot?

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Sanjeev replied | 30 Nov

A plot of radial distance versus the angle it makes with the x-axis is called polar plot.

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Vikas replied | 6 days ago

Polar Plot. A plot of a function expressed in polar coordinates, with radius as a function of angle.

As we have Cartesian Plot X,Y Graph, similarly R,Theta Coordinates i.e. Radius & Angle coordinates gives Polar Plot.

To convert from Polar Coordinates (r,theta) to Cartesian Coordinates (x,y) :
x = r × cos( theta )
y = r × sin(theta )

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T

Tarwar 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the difference between the microprocessor and micro controller?

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Shantanu replied | 24 Nov

To answer this in layman's terms:-
Microprocessor is a term used to describe a digital device that is exclusively used to perform computation involving multiple steps, typically, execute instructions that are stored in the memory and which can be programmed .

Micro controller on the other hand is a term that is used to describe a programmable device that is primarily...  more»
To answer this in layman's terms:-
Microprocessor is a term used to describe a digital device that is exclusively used to perform computation involving multiple steps, typically, execute instructions that are stored in the memory and which can be programmed .

Micro controller on the other hand is a term that is used to describe a programmable device that is primarily used to control a physical system.

A microprocessor is an Integrated Circuit (IC) which has only the Central Processing Unit (CPU) inside it. They lack Random Access Memory (RAM), Read Only Memory (ROM), and other peripherals on the chip. To deploy a microprocessor in a system, the above-mentioned peripherals are required to be connected. The Intel Pentium series, i3, i5, Cortex A8 are popular microprocessors which find their applications in desktop PC’s, Laptops, notepads etc.

Unlike microprocessors, micro controllers possess a CPU along with RAM, ROM, and other peripherals on the same chip. Therefore, it is also termed as a mini computer. Though the size of RAM and ROM and the processing power is far less as compared to an actual computer, it meets all the characteristics of a complete computer. Popular microcontrollers in the market are 8051, STM32, PIC32, Arduino, ATMEL etc. «less

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Brain Hub replied | 27 Nov

A microprocessor typically refers specifically to the device/component whose job it is to fetch commands, interpret the command opcodes, and execute the commands. In a modern microprocessor, this basically means the ALU, the register set, instruction pipeline, and the microprocessor control circuitry to perform the Von-neumann "fetch-decode-execute" cycle. One generalization is...  more»
A microprocessor typically refers specifically to the device/component whose job it is to fetch commands, interpret the command opcodes, and execute the commands. In a modern microprocessor, this basically means the ALU, the register set, instruction pipeline, and the microprocessor control circuitry to perform the Von-neumann "fetch-decode-execute" cycle. One generalization is that microprocessors require an external bus and discreet memory devices to interface with (separate from internal registers, and whatever built in caching memory the microprocessor contains).

Microcontrollers - on the other hand, are more generalized devices which contain a microprocessor, a main system bus, ram, ROM/flash, and typically a set of other devices such as a programmable interrupt controller, analog/digital converters, any number of general purpose IO devices, communications interfaces, etc...

So... microprocessors are the things that actually compute/calculate the work, and microcontrollers are devices which contain a microprocessor and a bunch of other integrated devices one might need when writing firmware.

Microcontrollers are not exclusively stand-alone devices as they need external circuitry to do things like bias their timing circuitry, provide power regulation, perform filtering and noise bypassing, etc... «less

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S

Sahiba 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the maximum amplitude of the sinusoidal signal (in volts) to prevent slope overload of the sinusoidal signal of 2 kHz frequency is applied to a delta modulator. The sampling rate and step-size of the delta modulator are 20,000 samples per second and 0.1 V, respectively?

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Sathyaprakash replied | 5 days ago

0.159 V.

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D

Dilip 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Define NMOSFET?

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Vikas replied | 6 days ago

A metal-oxide-semiconductor field-effect transistor (MOSFET) is a voltage-controlled electronic component invented by a South Korean Engineer Dawon Kahng, and his colleague Martin M. Atalla in 1959 whilst working at Bell Labs. It was the first insulated gate FET, consisting of a metal gate (M), oxide insulation (O), and silicone semiconductor material (S). In this device, a voltage...  more»
A metal-oxide-semiconductor field-effect transistor (MOSFET) is a voltage-controlled electronic component invented by a South Korean Engineer Dawon Kahng, and his colleague Martin M. Atalla in 1959 whilst working at Bell Labs. It was the first insulated gate FET, consisting of a metal gate (M), oxide insulation (O), and silicone semiconductor material (S). In this device, a voltage at the gate junction produces an electric field, which controls the current flowing between the source and drain junctions. This MOS technology was later utilised to develop integrated circuits (IC) which Kahng foresaw.
The differences in the operation between a MOSFET and a bipolar junction transistor (BJT) are huge, but the main ones are that a BJT is a current controlled device because current at the base junction controls the flow of current between the collector and emitter junctions. However, a MOSFET is a voltage-controlled device, where a voltage at the gate junction creates an electric field, which controls the flow of current between the source and drain junctions. «less

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Muskaan 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the adverb of Misogynous?

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Vikas replied | 29 Nov

Misyogynous means a system or a person who shows a strong dislike for women, or who acts in a way that negatively affects women in particular.
Adverb of it is Misogynously meaning act showing characters of that shows Misogynous behaviour.

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Pankaj 19 Nov 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____?

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Brain Hub replied | 24 Nov

Injection and subsequent diffusion and recombination of minority carriers.

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Meenakshisundarams 19 Nov 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?

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Sushil replied | 25 Nov

2*5 kHz = 10 kHz.

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A

Ashwin 19 Nov 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;?

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Sushil replied | 22 Nov

17H

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Answer

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K

Kanak 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

In the summer of 2012, in New Delhi, the mean temperature of Monday to Wednesday was 41 degree celsius of Tuesday to Thursday was 43 degree celsius. If the temperature on Thursday was 15% higher than that of Monday, then the temperature in degree celsius on Thursday was______ ?

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Shantanu replied | 24 Nov

Let the temperatures on Monday,Tuesday,Wednesday and Thursday is M,T,W and Th respectively.
The mean temperature of Monday to Wednesday was 41 deg C => (M+T+W)/3 = 41
=> M+T+W = 123 ---(a).
The mean temperature of Tuesday to Thursday was 43 deg C=> (T+W+Th)/3 = 43
=> T+W+Th = 129 ---(b).
(b)-(a) => Th-M = 6 ---(c).
temperature on Thursday...  more»
Let the temperatures on Monday,Tuesday,Wednesday and Thursday is M,T,W and Th respectively.
The mean temperature of Monday to Wednesday was 41 deg C => (M+T+W)/3 = 41
=> M+T+W = 123 ---(a).
The mean temperature of Tuesday to Thursday was 43 deg C=> (T+W+Th)/3 = 43
=> T+W+Th = 129 ---(b).
(b)-(a) => Th-M = 6 ---(c).
temperature on Thursday was 15% higher than that of Monday => Th = 1.15*M ---(d).
From (c) and (d), 0.15 M = 6 => M = 6/0.15 => Th = 1.15*6/0.15 = 46 «less

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Perl 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Complete the sentence with suitable grammar: Mount Everest is ____ ?

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Siva Naga Raju replied | 22 Nov

Options please. It is an incomplete sentence and can end in different ways without needing much of grammar like "Mount Everest is a mountain"

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Vikas replied | 23 Nov

Tallest mountain on the earth.

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D

Devinder 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Fill up: The policeman asked the victim of a theft, “ What did you_____?

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Vikas replied | 23 Nov

Lost.

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Vikas replied | 23 Nov

Lose.

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Sarvepalli 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the mean of the random variable, if the second moment of a Poisson distributed random variable is 2?

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Vikas replied | 23 Nov

Random variable means value is not known at the start.
Poisson distributed random variable means value of unknown discrete variable follows Poisson's distribution (Type of frequency distribution).

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Key replied | 24 Nov

For Poisson R.V
Mean = Variance.
So, Second Moment = Variance + (Mean)*(Mean) = Mean + Mean2 = 2.
On Solving, Mean = 2.

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N

Nayan 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What do you mean by communication with respect to telecommunication?

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Vikas replied | 23 Nov

Telecommunication is the transmission of signs, signals, messages, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems. Telecommunication occurs when the exchange of information between communication participants includes the use of technology. It is transmitted either electrically over physical media, such as cables,...  more»
Telecommunication is the transmission of signs, signals, messages, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems. Telecommunication occurs when the exchange of information between communication participants includes the use of technology. It is transmitted either electrically over physical media, such as cables, or via electromagnetic radiation. Such transmission paths are often divided into communication channels which afford the advantages of multiplexing. The term is often used in its plural form, telecommunications, because it involves many different technologies. «less

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Vishal 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the difference between ramp signal and triangular signal?

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Sushil replied | 25 Nov

Ramp signal is monotonically increasing/decreasing signal with positive or negative slope while triangular signal has discontinuities after which slop sign gets reversed.

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Rituparna 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Place an appropriate word: The principal presented the chief guest with a _______, as token of appreciation?

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Siva Naga Raju replied | 22 Nov

Momento.

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Vikas replied | 23 Nov

Bouquet.

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K

Kiran 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

A 16 Kb (=16,384 bit) memory array is designed as a square with an aspect ratio of one (number of rows is equal to the number of columns). The minimum number of address lines needed for the row decoder is ________ ?

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Shantanu replied | 23 Nov

Answer: 7.
Explanation:-
Generally the structure of a memory chip = Number of Row × Number of column (M*N)
The number of address line required for row decoder is n where M= 2^n
or n= Log(base2) M.
As per information given in the question: M=N
So M*N= M*M= M^2=16k = 2^4 * 2^10
=> M^2 = 2^ 14
M=128
n= log(base2) 128
n=7.

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Alok Singh Thakur replied | 23 Nov

Ans is 7;
as 16Kb=2^4*2^10=2^14
now memory = 2^(m*n);(m is no of column and n is no. of row)
here m=n
so 2^14=2^7*2^7
m=n=7

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Y

Yashraj 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

The transmitted signal in a GSM system is of 200 kHz bandwidth and 8 users share a common bandwidth using TDMA. If at a given time 12 users are talking in a cell, the total bandwidth of the signal received by the base station of the cell will be at least (in kHz) _________?

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Piyush Chauhan replied | 21 Nov

400 kHz

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Shantanu replied | 22 Nov

400 kHz
Explanation: Since GSM requires 200 KHz and only 8 users can use it using TDMA, 9th user needs
another 200 KHz.
9th, 10th, 11th, 12th user can use another 200 kHz bandwidth on time share basis.
Thus, for 12 user we need 400 kHz bandwidth.

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Jitendra 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Define hole current density?

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Siva Naga Raju replied | 22 Nov

It is answered in 2 parts. Holes are one of the charge carriers present in extrinsic semiconductors. Current Density (J) is defined as the current flowing per unit area of the conductor. So, Hole current density is a component of total current density in a semiconductor that is exclusively due to the movement of holes.

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Vikas replied | 23 Nov

In physics, a hole is an electric charge carrier with a positive charge, equal in magnitude but opposite in polarity to the charge on the electron. Holes and electrons are the two types of charge carriers responsible for current in semiconductor materials & the amount of electric current flowing per unit cross-sectional area of a material is known as current density.

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A

Asheesh 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

Define Modulation?

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Shantanu replied | 22 Nov

Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
It is a process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted. Modulation of a sine...  more»
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
It is a process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted. Modulation of a sine waveform transforms a base band message signal into a pass band signal. «less

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Vikas replied | 23 Nov

Modulation is the addition of information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform -- constant height (amplitude) and frequency. Information can be added to the carrier by varying its amplitude, frequency, phase, polarization (for optical signals), and even quantum-level phenomena like spin.

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Aparna 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the maximum value of angle until which the approximation sin(x) holds to within 10% error?

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Test 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What do you mean by divergence of vector?

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Pritam 19 Nov in  GATE Coaching classes, Electronics & Communication(GATE Coaching classes)

What is the output of the impulse rate of a system h(t) = t * u (t) having an input u(t - 1)?

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