State the need of modulation in communication system.

1 Answer

Answer :

Need of modulation:- 1. To reduce the height of antenna 2. To avoids mixing of signals 3. To increases the range of communication 4. To make multiplexing of maximum signal is possible 5. To improve the quality of reception

Related questions

Description : i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Last Answer : Significance of modulation index in AM transmission  It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.

Description : The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W 

Last Answer : The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is 66 W

Description : What is channel length modulation in MOSFET?

Last Answer : Shortening of lenght of the inverted channel region with increase in drain bias for large drain biases due to which current increases with drain bias and output resistance decreases is called channel length modulation in MOSFET.

Description : State advantages and disadvantages of fiber optic communication

Last Answer : Advantage of fiber optic communication: 1.Greater information capacity/ higher bandwidth OFC's are capable of transmitting several gigabits per second over hundreds of miles allowing millions of ... are not flexible 7.Requiring more protection around the fiber cable compared with copper cable

Description : What specific communication concepts are powering the change/addressing the need of a non profit organization?

Last Answer : It might help to know who is asking this question for a frame of reference. But off the top of my head, and given what I know about non profits, I would say that communication between ... . Perhaps programs that communicate units of service or charges to the funding source, those types of things.

Description : Draw block diagram of CNC system and state function of each block.

Last Answer : (i) Input Devices: These are the devices which are used to input the part program in the CNC machine. There are three commonly used input devices and these are punch tape reader, magnetic ... Unit: A monitor is used to display the programs, commands and other useful data of CNC machine. 

Description : Define measurement and state the significance of electrical measurement system.

Last Answer : Measurement: Measurement is essentially a process in which magnitude of a quantity is determined in comparison with another similar quantity with significant units. OR The measurement of a given ... x) The measurement conforms the validity of hypothesis and also adds to its understanding.

Description : State two advantages of digital system over analog system.

Last Answer : 1. They are less susceptible to noise. 2. The effect of fluctuation in the characteristic of the components, ageing of components etc. is very small in digital circuits. 3. Digital circuits have capability of memory which makes them suitable for computers. 4. More accurate.

Description : Draw block diagram of instrumentation system. State function.

Last Answer : Primary transducer: The sensor which comes in contact with the measurement medium to sense the quantity. Variable conversion element: the transducer which converts the sensor ... transmitted through suitable transmission medium to the operator or presented with the help of indicators.

Description : State the functions of fuel system and exhaust system of a diesel power station.

Last Answer : Fuel system: It supplies fuel to engine for combustion purpose. It consists of Fuel Pump: - It supplies fuel to engine for combustion purpose. Strainer: - Are provided to remove suspended impurities and ... most of the noise. Chimney:- To exhaust gases in the atmosphere as high as possible. 

Description : State any four advantages of interconnected system.

Last Answer : Advantages of interconnected Systems: i) Reduced Overall installed Capacity: Inter connected power systems reduce the overall requirement of installed capacity for a given load area. With ... to interconnection, there is optimum utilization of available natural resources in the country.

Description : State the functions of following elements: i) Diesel engine system ii) Air intake system iii) Engine exhaust system iv) Engine starting system.

Last Answer : i) Diesel engine system:-  Four strokes Two strokes ii) Air intake system:- Air intake system is provided to supply air to engine cylinder for fuel combustion.  iii) Engine exhaust system ... provided to rotate the engine initially until the firing starts and engine run under its own power. 

Description : steady-state stability of a power system is improved by

Last Answer : steady-state stability of a power system is improved by using double circuit line instead of single circuit line

Description : If communication through language hadn't occurred in the evolution of men, would there have been thought?

Last Answer : There is evidence of thought in critters without language. Evidence of language, without thought. Humans I think without language, technology would be limited, but certainly there would have been thought, and learning.

Description : What would you do if you get email communication not intended for you?

Last Answer : Yup, and I just delete them, I don’t even try and open them with all the virus bullcrap with emails these days.

Description : Have you ever known someone whose communication skills assume you are a mind reader?

Last Answer : I don’t have to deal regularly with people like that, thankfully! She sounds like a real joy to live with.

Description : How can inter-galactic communication between humans and aliens be practical?

Last Answer : Your observations are correct as long as we’re limited to speed-of-light transmissions, and as far as I know we still are.

Description : Is a lack of communication equivalent to silence?

Last Answer : answer:lack of communication does communicte when there is a personal episode between partners. it's understood that something must be wrong. lack of communcation with several folks though needs clarity from ... a silent treatment only makes it worse for all parties involved. start a dialogue asap.

Description : Helicopters: are any quiet enough that one can ditch the headset/intercom for verbal communication?

Last Answer : Not to my knowledge. back in the 60s, i gave the nations very first traffic helicopter reports in Nashville. the helicopter we used back then was noisy, just like the ones of today. inside noise ... . to do so, would add a considerable amount of weight and helicopters do not need the weight.

Description : Does anyone know to whom I should write to send a personal communication to Alice Cooper?

Last Answer : Send the message in a tube rather than an envelope. His curiosity will get the better of him.

Description : I just read, in passing, that a psychiatrist said that 85% of our communication is non-verbal. Does that sound about right to you?

Last Answer : Yes, I learned that lesson from a wise energy worker/therapist I met once. She said that we humans tend to put much more weight on the verbal than we should to the detriment of reading the ... messages. It explained so well the contradictory words and actions of a friend that had been troubling me.

Last Answer : The inductive interference between power and communication line can be minimized by transposition of the power line, transposition of the communication line.

Last Answer : The interaction between a transmission line and communication line is minimized by transposing transmission as well as communication lines, increasing the height of the transmission line tower, increasing the distance between the two lines.

Description : Explain Inter-process Communication (IPC) using mailbox/queue.

Last Answer : Inter-process communication using mailbox: Mailbox is the Interprocess communication mechanism. A process puts a data message for another process in the mailbox. Mailbox is also called as message exchange. ... a message. In mailbox IPC the sender need not to know the name of the receiver.

Description : characteristics of Hi-Fi amplifier system.

Last Answer : Characteristics of HI-FI amplifier: 1. Signal to noise ratio should be better than 50dB. 2. Frequency response should be flat within +-1dB. 3. Nonlinear distortion should not be more ... provided. 6. Environmental conditions should be such as to eliminate the external noise in listening room. 

Description : DTH System

Last Answer : Outdoor unit: It consists of a receiving antenna, low noise amplifier & converter the receiving antenna is parabolic reflector with a horn as the active element. The horn can be ... fed to the normal domestic TV receiver, which after due processing reproduces picture & sound. 

Description : Describe the function of MUSE system for HDTV.

Last Answer : Bandwidth can be reduced by MUSE (Multiple Sub -Nyquist Sampling Encoding) system MUSE stands for Multiple Sub-Nyquist sampling encoding and is an HDTV bandwidth compression schemedeveloped by ... digital Audio system is called DANCE (Digital Audio Near-Instantaneous Compression and expansion). 

Description : requirements of a distribution system

Last Answer : Following requirements of a distribution system.  1. Layout should be simple in design. 2. It should have less initial cost 3. The distribution system should have minimum distribution ... stability of existing distribution system. 15. Time required for completion of work should be less. 

Description : Why radial distribution system used for short distance ? 

Last Answer : Because of following disadvantages radial distribution system is not used for long distance:  Since there is only one feeder to DTC feed at one point so, 1) There is no reliability ... more time for fault finding & repairing Hence radial distribution system is used for short distance.

Description : vertical deflection system and explain its operation.

Last Answer : The main function of the vertical deflection system , is to provide an amplified signal of proper level to derive the vertical deflection plates without any distortion. For amplification of the ... suppression, reduced nonlinear effects because none of the plates are at ground potential.

Description : Working of Simple Vapor absorption system

Last Answer : Working of Simple Vapor absorption system:  A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. In this system ammonia ... where there is scarcity of Electricity and it is very useful at partial and full load. 

Description : Write four advantages of FMS (Flexible Manufacturing System).

Last Answer : 1. Large variety of same products 2. Profitable investment. 3. Requires limited inventory. 4. Low labor cost. 5. Flexible system. 6. Speedy production. 7. Improve product quality. 

Description : List and explain the components of a hydraulic system.

Last Answer : Components Hydraulic: Hydraulic pump- Supply fluid to the components in the system. Pressure in the system develops in reaction to the load. Hence, a pump rated for 5,000 ... mechanical components and need to be removed along with other contaminants.  Seals, fittings and connections.

Description : Explain how MEMS accelerometer is used as airbag sensor for car system.

Last Answer : MEMS Accelerometer is used as airbag sensor: Mechanical ignition airbags fit inside the steering wheel pad. When a collision occurs, the inertial sensor moves, setting off a ... the airbag with wiring. This is especially effective when fitting both driver- and passenger-side airbags.

Description : What are advantages and disadvantages of Mechatronics system? 

Last Answer : Advantages of Mechatronics system:  High level of integration.  Increased functionality and better design.  More use of electronics and software instead of mechanical function.  Assumes ... Its replacement is difficult, that it is difficult to change old system to new system. 

Description : Explain in brief how anti-lock braking system works

Last Answer : An ABS is a system on motor vehicles which prevents the wheels from locking while braking stopping safely is one of the most important functions a motor vehicle can perform. Diagram: ... to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.

Description : Differentiate between pneumatic and hydraulic system. 

Last Answer : Pneumatic System Hydraulic System 1 Pneumatic system uses gas for power transmission, after compression and it is used as medium for carrying out mechanical work. ... : In industrial applications, air conditioners Applications: In petrochemical industries, oil refineries.

Description : Explain the Mechatronics system with the help of block diagram and labeled the various elements. 

Last Answer : The key elements of Mechatronics systems can be classified under following categories:  Information systems  Mechanical systems  Electrical systems  Computer systems  Sensor and actuators  ... is adjusted based on generated error and again signal is given to actuators and sensors.

Description : Describe the procedure for working of paging system.

Last Answer : Pager is a Simplex Communication Device. Paging Systems are communication systems that send messages to a subscriber. Message can be numeric or alphanumeric. Paging Systems are used to notify a subscriber ... message is sent by sender to his pager and the message will be displayed in the LCD.

Description : Why solar system is preferred now a days ? Justify your answer. 

Last Answer : Since availability of fossil fuels like coal are limited in future so there is more importance of solar power in the energy deficient because of following advantages of solar power Fuel is ... .  10. solar system technology are ideally suited to distributed applications ( Decentralized system)

Description : Draw and explain integrated duration curve used in system operation. 

Last Answer : Diagram of integrated duration curve used in system operation: Explanation:  Integrated duration curve is obtained from load duration curve. It is drawn in between load on Y-axis in KW/MW and the X- ... a particular time of a day can also be shown on a curve which is called as mass curve. 

Description : What are the disadvantages of Open loop control system?

Last Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

Description : Draw the block diagram of basic wind energy conversion system and write function of each block. 

Last Answer : Block diagram of basic wind energy conversion system: OR Components of wind power plant and their functions:  1) Rotor /Blade/Aero-turbine: Blade extracts significant power from the ... stronger and smoother. Towers are supports to raise the main part of the turbine up in the air.

Description : Explain starting system in diesel electric power plant.

Last Answer : Starting system in Diesel Electric Power Plant: It includes Storage battery, compressed air tanks, self-starter etc. The purpose of engine starting system is to rotate the engine initially while ... as Ammeters, Voltmeters, Wattmeters, Thermometers, Pressure gauges, Visible and audible alarm etc.

Description : Explain fuel system and air intake system in diesel electric power plant.

Last Answer : Fuel system and air intake system in diesel electric power plant :  Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.

Description : What is the choice of size and number of generator units in interconnected power system?

Last Answer : Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

Description : Explain significance and purpose of electrical measurement system.

Last Answer : ➢ Significance of Electrical Measurement System  1. The measurement is required for measurement of all physical quantities for e.g speed, velocity, temperature, pressure etc.  2. All electrical ... 4. These standards and references may changes time to time, area to area person to person 

Description : The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

Last Answer : The permissible voltage variation in transmission and distribution system is: ±10%

Description : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Last Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Description : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm