search
person

Explain the significance of over modulation.

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.

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 : Explain the pulse width modulation technique for control of AC output voltage.

Description : Explain significance and purpose of electrical measurement system.

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

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 the significance of term measurement. 

Answer : Measurement is the quantitative comparison between unknown quantities with known standard. For doing this process there is need of physical device, called as measuring instrument. The measurement confirms the validity of the hypothesis and also adds to its understanding.

Description : State the significance of power factor.

Answer : Significance of power factor:-  1. Cosine of angle between voltage & current in a circuit is called power factor. 2. It is a measure of the real power in a circuit. 3. Inductive & ... KVA rating equipment 5. Greater conductor size 6. CosØ = R/Z  CosØ= Active Power/ Apparent Power 

Description : what are the significance of kernel in RTOS ?

Answer : In every RTOS there is the kernel. The kernel is the core supervisory software. The kernel provides minimal logic. Scheduling is also provided by the kernel. The resource- ... device managment service.RTOS kernel has interrupt management service.RTOS kernel has memory management service.

Description : State the need of modulation in communication system.

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

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 

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?

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 : Thyristor can be protected from over voltages by using

Answer : Thyristor can be protected from over voltages by using Voltage clamping device

Description : State any two advantages of MCB over Fuse. State the standard specifications of MCB available in the market.  

Answer : Following advantages of MCB over Fuse: 1. No need of replacement of fuse wire. 2. Manually restore of supply is simple. 3. Fault understanding by visual inspection 4. More safe than fuse The standard specifications of ... 6A, 10A,16A,20A, 25A, 30A, 32A, 40A, 50A, 60A and 63A 6. 250V and 450 v

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

Description : State advantages of short pitch winding over full pitch winding in alternators. 

Answer : Advantages of Short Pitch Winding over Full Pitch Winding in Alternators: 1) Short pitching reduces the amount of copper needed for end connection when compared with full pitched coil. 2) They ... reduced, thereby increasing the efficiency. 4) The power quality of generated emf is improved. 

Description : What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.

Answer : Active Filter: Active Filter is formed by using active element along with the passive components.  Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is ... pass band.  Stop Band Filter: The frequency range which is attenuated is known as stop band.

Description : What is the advantage of AC over DC electrical transmission?

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

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 : The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

Answer : Ac is easy to maintain and ac can be easily converted to dc by rectifier .There is no commutator for conversion in ac that's why ac machines are weight less and more efficiency.ac machines occupy less space than dc .

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

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 : The surge impedance for over head line is taken as  (1) 10-20 ohms (2) 50-60 ohms (3) 100-200 ohms (4) 1000-2000 ohms

Answer : The surge impedance for over head line is taken as 100-200 ohms

Description : In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Answer : In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

Answer : In over compounded generator, full load terminal voltage is more than no load terminal voltage.

Answer : An over excited synchronous motor on noload is known as synchronous condenser.

Answer : Over voltage protection is recommended for hydro-electric generators, steam turbine generators, gas turbine generators.

Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

Description : What is meant by flash over voltage?

Description : Explain in detail over-voltage protection.

Answer : Over-voltage protection: Over-voltage protection to the thyristor is provided using: i) R-C Snubber circuit ii) Non-linear resistor Thyrector A) Snubber Circuit: It is basically a ... returns to its high resistance state. Thyrector is normally placed across the supply terminals.

Description : What is crossing over? What is its significance?

Answer : Ans: Exchange of genetic material between homologous chromosomes during pachytene of meiosis is called as crossing over. It brings about variations in the offspring due to recombination. It helps in natural selection and evolution.  

Description : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to   (a) 30o (b) 60o (c) 120o (d) 150o

Answer : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to 120o

Description : In amplitude modulation scheme, the over-modulation (A) is desired phenomenon (B) helps in signal recovery (C) is undesired phenomenon (D) Envelope of AM maintains the shape of the baseband signal

Answer : In amplitude modulation scheme, the over-modulation is desired phenomenon

Description : Which modulation scheme would you suggest for high speed data transmission over a fading channel?  A) MSK B) BPSK C) FSK D) OFDM

Answer : Excessive high voice signal may cause overmodulation. Modulating component greater than carrier may cause overmodulation. Setting the gain of the microphone too high may cause overmodulation.

Description : How GTO is advantages over SCR

Answer : i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off. 

Description : A FET is preferred over an ordinary transistor because it  1. Permits high degree of isolation between input & output circuits 2. Has low noise level 3. Has very high power gain 4. Has all the above properties 

Answer : A FET is preferred over an ordinary transistor because it Has all the above properties 

Description : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

Answer : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group

Description : Why is pulse train gating preferred over pulse gating? Explain with relevant circuit and waveforms, the pulse train gating of SCRs.

Answer : Because it has a higher switching frequency and heat tolerance.

Description : Give the significance of sterilization using bactericidal solution, explain the method and name the bactericidal agents.

Answer : Significance: The lethal effect of bactericide increases with the rise of temperature. This method is used for sterilizing aqueous preparation, which is unstable at the higher temperature, hence moist heat ... minutes in boiling water. IP 1985 permitted the use of following bactericides

Description : Explain the significance of BVS Depot with lay-out.

Answer : Significance of Bus Depot: Bus depot has important roles for a region that chooses bus mode in their transport system. Bus depot development attracts many attentions in the world of real estate ... right facilities to accommodate people and buses activity continuously in short and long period.

Description : Explain the significance of gating system in casting process with the sketches.

Answer : Significance of Gating system in casting process: The term gating system refers to all passageways through which the molten metal passes to enter the mold cavity. It provides continuous, uniform feed of ... walls. It prevents slag, sand and other foreign particles from entering the mould.

Description : Explain match plate pattern with its significance.

Answer : Match plate pattern with significance: In Match plate pattern the cope and drag patterns along with the gating and the risering are mounted on a single matching metal or wooden plate on either side ... . They are expensive but since they increase productivity, the additional cost is justified.  

Description : Explain briefly following: 1) Significance of heavy minerals in provenance studies 2) Evolution of Mesozoic reptiles

Description : Define route sheet. Explain a route sheet in detail. Also state significance of it.

Answer : Definition of Route sheet  Route sheet is written document which includes operation number, description of operation, machine used, tools and gauges used and standard time for any particular operation. The ... the efficiency of a work centre. [6] It helps to trace the material movement.

Description : Explain the significance of proximate analysis. 

Answer : Significance: Proximate analysis provides following valuable information in assessing the quality of fuel i) Moisture: - Lesser the moisture better is the quality of coal. ii) Volatile Matter: - Lower / ... iv) Fixed Carbon: - Higher the percentage of fixed carbon, greater is the calorific value.

Description : Explain Reynold’s number with its equation and give significance.

Answer : The Reynolds number is defined as the ratio of inertia force to viscous force. Reynolds number is dimensionless number. It is used to determine the laminar or turbulent flow type. Significance : Using value of Reynold's number the type of flow can be identified.

Description : Explain the significance of batching, compaction and curing of concrete. 

Answer : Significance of Batching: 1. If the batching of materials required for concrete is not done appropriately, then random quantity of materials produce non-homogeneous concrete, which further leads to various ... . 3. Curing is necessary to make the concrete impermeable in nature its hardened state.

Description : Explain the significance of water reducing admixture in concrete with respect to properties of concrete.

Answer : Significance of water reducing admixture in concrete: Water reducing admixtures are essential for several purposes. The effect of using such admixtures on concrete properties is described below. 1. Water ... strength. 7. The durability of concrete structures can be ensured by using these admixtures.

Description : State law of machine and explain its significance.

Answer : Law of machine: The relation between the load lifted (W) and the effort applied (P) is known as the law of machine. This relationship, when plotted on a graph results in a straight line as shown ... the help of law of machine one can find effort required to lift any given load and vice versa.

Description : Explain the significance of the Laplace transform in control system.

Answer : Significance of Laplace Transform- * Laplace transform convert higher order integral differential equation into simple algebraic form. * Laplace transform converts the differential equation into an algebraic ... equations. * Laplace transform convert time domain to frequency domain (s-plane). 

Description : State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line

Answer : Significance of earthing:  * Earthing means connecting the body of the electrical equipment (it means the part which does not carries current under normal condition) to the earth. For example electrical equipment' ... surrounded by charcoal and salt.  the values of earth resistances for: 

← Prev Question Next Question →
editAsk a Question
...