Description : Compare sky wave and space wave propagation w.r.t. following points. (i) Frequency range (ii) Effect of fading (iii)Polarization (iv)Application
Last Answer : Sr. No Parameters Sky Wave Propagation Space Wave Propagation 1 Frequency range 3 MHz to 30 MHz Above 30 MHz 2 Effect of fading Problem of fading is ... horizontally Polarized 4 Application RadioBroadcasting (SW Range) Used for TV and FM broadcasting
Description : Compare narrow band FM with wide-band FM w.r.t. following points. (i) Modulation index (ii) Maximum deviation (iii)Range of modulating frequency (iv)Application
Last Answer : Sr. No Parameters Narrow band FM Wide band FM 1 Modulation index Less than or slightly greater than 1 Greater than 1 2 Maximum deviation ... like police wireless, ambulance etc. Entertainment broadcasting can be used for high quality music transmission
Description : Explain why reception for high frequency band is better during night time.
Last Answer : In sky wave propagation, the transmitted signal travels into the upper atmosphere where it is bent or reflected back to earth. This bending or reflection of signal takes place due to the presence ... reflected signal and hence the reception for high frequency band is better during night time.
Description : Sketch AM signal in (1)Time domain (2)Frequency domain.
Last Answer : AM in Time domain AM in frequency domain
Description : Write the IF value of (i) FM ratio recevier. (ii) MW band AM.
Last Answer : (i) 10.7 Mhz (ii) 455 Khz
Description : Draw the practical AM diode detector circuit. Sketch its input and output waveforms.
Last Answer : Practical AM diode detector 1. Skip distance:-Skip distance is defined as the shortest distance from a transmitter, measured along the surface of earth at which a sky wave of fixed frequency ... had taken place from a surface located at a greater height, called Virtual height of this layer.
Description : Explain Tropospheric scatter propagation with sketch.
Last Answer : As the name implies, troposcatter uses the troposphere as the region that affects the radio signals being transmitted, returning them to Earth so that they can be received by the ... of "blurring" the overall received signal and this makes high speed data transmissions difficult.
Description : Draw and label PLL based FM detector.
Last Answer : Draw and label PLL based FM detector.
Description : A 400 W carrier is amplitude modulated to a depth of 75%.Calculate the total power in AM wave. (i) Explain the types of noise in a communication system. (ii) Compare simplex and duplex mode of communication.
Last Answer : (i) Noise: Noise is any spurious or undesired disturbances that mask the received signal in a communication system. a) Atmospheric Noise: Atmospheric Noise is also known as static noise which is the ... remote control ExamplesWalkytalky,telephone,mobile,Radar, FAX,Pager 4
Description : Derive a mathematical expression for AM wave.
Last Answer : Derive a mathematical expression for AM wave.
Description : Explain the working of half dipole antenna with its radiation pattern.
Last Answer : Half wave dipole antenna diagram Explanation: 1. It is a resonant antenna 2. It is exact half wavelength (λ /2) long & open circuited at one end. 3. The dipole ... waves exist. Hence radiation pattern is bidirectional. The radiation pattern of half wave dipole antenna is -
Description : Draw the block diagram of AM. Super heterodyne ratio receiver and state the function of each block
Last Answer : AM super heterodyne receiver works on the principle of super heterodyning. In the super heterodyne receiver, the incoming signal voltage is combined with a Signal generated in the receiver. The ... constant output level at the speaker even though the signal strength at the antenna varies.
Description : Explain Electromagnetic spectrum.
Last Answer : The information signal should be first converted into an electromagnetic signal before transmission because the wireless transmission takes place using electromagnetic waves. The electromagnetic waves are oscillations which ... This entire range of frequency of EM waves is called EM spectrum.
Description : Explain structure of rectangular microstrip patch antenna with its radiation pattern.
Last Answer : In telecommunication, a microstrip antenna (also known as a printed antenna) usually means an antenna fabricated using microstrip techniques on a printed circuit board (PCB).It is a kind of ... microstrip transmission line with equivalent loads on either end to represent the radiation loss.
Description : Explain the concept of De-emphasis with neat diagram.
Last Answer : In the De-emphasis circuit, by reducing the amplitude level of the received high frequency signal by the same amount as the increase in pre-emphasis is termed as De-emphasis. The pre- ... de-emphasis circuit is a low pass filter or integrator which allows only low frequencies to pass.
Description : Draw the basic block diagram of Electronic communication system. State the function of transmitter.
Last Answer : Block diagram: Transmitter The function of the transmitter is to process the electrical signal from different aspects. For example in radio broadcasting the electrical signal obtained from sound ... the message signal are done just to ease the transmission of the signal through the channel.
Description : Sketch the radiation pattern of Yagi-Uda antenna.
Last Answer : Sketch the radiation pattern of Yagi-Uda antenna.
Description : Define fading w.r.t. wave propagation.
Last Answer : Fading: The fluctuation in signal strength at a receiver, which is mainly due to the interference of two waves which left the same source but arrived at the destination by different paths, is known as fading.
Description : Define modulation index of FM.
Last Answer : Modulation index of FM is defined as the ratio of the frequency deviation to the modulating frequency.
Description : Define the term signal to noise ratio.
Last Answer : Signal to Noise ratio: The ratio of the strength of an electrical or other signal carrying information to that of unwanted interference is called as signal to noise ratio. OR Signal to Noise Ratio is defined as ... the same point. S/N=Ps/Pn where,Ps=Signal Power Pn=Noise Power at the same point
Description : Write down different frequencies for following(frequency ranges). (1) Voice frequency (2) High frequency (3) IR frequency (4) Visible frequency(light)
Last Answer : Sr. No Frequency Range 1 Voice Frequency 300 Hz to 3kHz 2 High Frequency 3 MHz to 30 MHz 3 IR Frequency 30 THz to 430 THz 4 Visible Spectrum (light) 375 THz to 750 THz
Description : What is the frequency range of an aircraft’s radio altimeter? A. 962 MHz to 1213 MHz B. 329.15 MHz to 335.00 MHz C. 4250 MHz to 4350 MHz D. 108.00 MHz to 117.95 MHz
Last Answer : C. 4250 MHz to 4350 MHz
Description : The extremely high frequency (EHF) band is in the radio spectrum range of _______. A. 30 to 300 kHz B. 30 to 300 GHz C. 3 to 30 MHz D. 3 to 30 GHz
Last Answer : B. 30 to 300 GHz
Description : What frequency range is used for FM radio transmission? A. Very Low Frequency : 3 kHz to 30. kHz B. Low Frequency :30 kHz to 300 kHz C. High Frequency :3 MHz to 30 MHz D. Very High Frequency : 30 MHz to 300 MHz E. None of the above
Last Answer : Very High Frequency : 30 MHz to 300 MHz
Description : The frequency range of FM radio is
Last Answer : The frequency range of FM radio is 88MHz to 108MHz
Last Answer : The frequency modulated (FM) radio frequency range is nearly 90 - 105 MHz.
Description : Is there any way to make diamond flouresce in the visible or near IR region?
Last Answer : Here is article by GIA (Gem Institute of America) it is UV activated.
Description : Windows program to record IR signals and rebroadcast them?
Last Answer : Try searching on the term IR repeater.
Description : How could I use my PC's IR port for this?
Last Answer : Hack a Day has projects like that. Searching the site for ‘infrared’ might generate some ideas.
Description : I need something to take use of my laptops IR port.
Last Answer : You are going to have to write one. I haven’t owned a notebook computer with an IR port for many years – haven’t even seen one. Like RS232 ports they seem to have faded away.
Description : Can I use a RC-5 IR remote with a Canon 500D?
Last Answer : I’m on my phone right now or I’d try it for you but have you tried this same question on the Canon site?
Description : Rerout an IR signal to a receiver from a remote?
Last Answer : answer:Yes! You need an infrared repeater like this one or you can set up a series of mirrors to redirect the signal.
Description : What is the full form of 'IR' ? -How To ?
Last Answer : The full form of 'IR' is Indian Railway
Description : What is the atomic number of Ir ?
Last Answer : The atomic number of Ir is 77
Description : Explain the use of IR rays in medical field ?
Last Answer : Although IR rope is not yet used in medical field in our country, it is widely used in various physiotherapy. However, this method is also being used extensively in the outside world. In ... Diagnosis of blood circulation in damaged or damaged cells. Diagnosis of oxygen transport in blood and cells.
Description : If CFSE increases by 30% and 40% respectively for `Co^(3+) " to " Rh^(3+) " to " Ir^(3+)`, then the total increase in CFSE for `Ir^(3+)` with respect
Last Answer : If CFSE increases by 30% and 40% respectively for `Co^(3+) " to " Rh^(3+) " to " Ir^(3+)`, then the ... Ir^(3+)` with respect to `Co^(3+)` is ..
Description : Why water is not good solvent for ir spectroscopy?
Last Answer : Need answer
Description : What do -ar -ir and -er infinitive verbs have in common in the future tense?
Description : What does Ir. mean?
Last Answer : Industrial Relations
Description : What is an IR cable for a TV box?
Last Answer : An IR Blaster cable is a USB device. It creates a wireless, infrared connection between your cable box and the PC running beyond TV.
Description : The ___________ contains the address of the next instruction to be executed. a) IR b) PC c) Accumulator d) System counter
Last Answer : Answer: b Explanation: PC stands for program counter (It contains the address of the next instruction to be executed)
Description : Thiamidine dimer formation in DNA is caused by - (1) IR-rays (2) X-rays (3) b and g-rays (4) UV-rays
Last Answer : (4) UV-rays Explanation: When cells are exposed to sunlight, radiant energy damage the DNA. For example, ultraviolet irradiation causes covalent bond formation between adjacent thymines on the same strand of ... . This added energy opens up the bond and allows it to react with a neighboring base.
Description : The decoded instruction is stored in ______ (A) Register (B) Memory Address Register(MAR) (C) Instruction Register(IR) (D) None of the Above
Last Answer : (C) Instruction Register(IR)
Description : Which registers can interact with secondary memory? (A) Register (B) Memory Address Register(MAR) (C) Instruction Register(IR) (D) None of the Above
Last Answer : (B) Memory Address Register(MAR)
Description : Although saturable reactors are extremely useful in some applications, their gain is low because of ____________. A. core hysteresis losses B. inductive reactance in the control winding C. IR drop throughout the load winding D. all of the above
Last Answer : Answer: A
Description : The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as _____________. A. line droop B. line loss C. IR drop D. hysteresis
Last Answer : Answer: B
Description : Both Infrared and Microwave bands are invisible to the human eye. Then how are IR and microwave images from remote sensing satellites printed? How do they substitute the wavelengths?
Last Answer : Both infrared and microwaves are part of the electromagnetic spectrum, which stretches from radio waves to gamma rays. each band of this spectrum corresponds to a small range of frequencies. Each ... levels) are finally printed on a computer screen as a picture or as a conventional photograph.
Description : Name the spectral series which appear in the region of electromagnetic spectrum. (a) Visible region (b) UV region (c) Far IR region
Last Answer : Ans: (a) Balmer Series (b) Lymen Series (c) Pfund Series
Description : Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is (A) IR (B) I 2R (C) IR 2 (D) I 2R
Last Answer : (B) I 2R
Description : Equation which measures alternating voltage is A. Vsin ω B. sin t C. Vo sinωt D. V=IR
Last Answer : Vo sinωt