State the meaning of ferranti effect and proximity effect.  

1 Answer

Answer :

i) Ferranti effect : When long distance transmission is lightly loaded or there is no load condition than it is observe that receiving end voltage (VR) is found to be greater than sending end voltage (VS). This phenomenon is known as Ferranti effect.


ii) Proximity effect: 

image


Explanation: Let two alternating current carrying conductors placed near to each other as shown in figure. Due to electro-magnetic action, flux produced by each conductor links with each other. Due to this super –impose of magnetic field on conductor causes current in each conductor is re-distributed. This is known as proximity effect.

Related questions

Description : Under Following conditions Ferranti effect occurs: 

Last Answer : Under Following conditions Ferranti effect occurs:  1. When there is no load on transmission line (IL = 0) 2. When There is no load at receiving sub-station or Lightly loaded 3. When ... VR) is found to be greater than sending end voltage (VS). This phenomenon is known as Ferranti effect.

Description : Ferranti Effect is more pronounced when ___________ A) the line is longer and the voltage applied is higher B) the line is shorter and the voltage applied is lower C) the line is shorter and the voltage applied is higher D) none of these

Last Answer : Ferranti Effect is more pronounced when the line is longer and the voltage applied is higher

Description : what is Ferranti effect?

Last Answer : Ferranti effect is the increase in voltage at receiving end than sending end means sending end voltage is less than receiving end . It is occurs in long transmission line when the line is lightly loaded or at no load.

Description : List out factors affecting proximity effect. 

Last Answer : Factors affecting proximity effect: 1. Conductor size (diameter of conductor) 2. Frequency of supply current. 3. Distance between conductors. 4. Permeability of conductor material 

Description : State the meaning of skin effect and how can it be minimised. 

Last Answer : Meaning of skin effect :  When alternating current flows through conductor it has tendency to flow away from center of conductor. i.e. maximum current density is near skin of conductor and goes on ... whenever possible as Skin effect is absent (Since frequency 0) instead of A.C. supply.  

Description :  State the disadvantages of skin effect.

Last Answer : Disadvantages of skin effect:- 1. Full cross section of conductor is not utilized, Therefore effective area of conductor reduces so its resistance increases. 2. Due to increase in resistance, copper ... increases (Since Voltage drop = IR ) 5. So voltage regulation becomes poor (increases) 

Description : State seeback effect. Describe the working of thermocouple.

Last Answer : Seebeck effect: Seebeck effect states that whenever two dissimilar metals are connected together to form two junctions out of which, one junction is subjected to high temperature and another is subjected to ... both the junctions a very low emf is produced which causes a current in the circuit. 

Description : How could I get a flashing effect for video wallpaper?

Last Answer : The picture is hidden behind a login form, could you put it on, say, imageshack.us?

Description : How Does Obesity Effect Diabetes ?

Last Answer : How Does Obesity Effect Diabetes Obesity and diabetes are two diseases that are cause for serious concern among many Americans. Every year, more and more overweight and obese people run the risk of developing ... , you can win the battle against obesity, and save your own life at the same time.

Description : Piezo-electric effect

Last Answer : Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. The word Piezoelectric is derived from the Greek piezein, which means to squeeze or ... Storage Temperature Range: -55 to + 125°C Insulation Resistance: 500 M ohms

Description : Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.

Last Answer : Armature Reaction: The effect of armature flux on main flux is called as armature reaction.  Armature Reaction at Various Power Factors: When armature is loaded, the armature flux modifies ... lagging p.f. For capacitive loads the effect of flux is partly distorting and partly strengthening.

Description : Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life. 

Last Answer : 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series.  2) ...   4) Effect on Life:- If supply voltage is not stable then life of LED get reduced. 

Description : With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.

Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage. 

Description : Explain in brief ‘Hall effect sensor’. 

Last Answer : Working: * Working principle of a Hall effect sensor is that if strip of conducting material carries a current in presence of transverse magnetic field as shown fig . * The difference of ... with Hall strip. * When a transverse magnetic field passes through the strip, the voltage difference 

Last Answer : The phenomenon of ionization of surrounding air around the conductor due to which luminous glow with hissing noise is rise is known as the corona effect.

Description : What is piezoelectric effect? Name two piezoelectric material.

Last Answer : piezoelectric effect: Piezoelectric effect can be stated as follows: when a pressure or force or vibration is applied to crystalline material like quartz crystal or crystalline substances, then ... crystal: Quartz crystal ,Rochelle salt 2) Synthetic crystals : Barium Titanate, Lithium sulphate

Description : Explain magnetic effect employed in measuring instrument.

Last Answer : Magnetic Effect:  I) In PMMC meters:  ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force.  Examples: Electrodynamometer type instruments, Induction type instrument. 

Description : Define junction field effect transistor (JFET) and give an example.

Last Answer : Junction Field-Effect Transistor: It is a semiconductor device having three terminals, namely Gate, Drain and Source, in which the current flow is controlled by an electric field set up by an external voltage applied ... : i) n-channel JFET and ii) p-channel JFET Examples of JFET: BFW 10, BFW 11 

Description : When does the Body bias effect occur in an n-channel MOSFET?  A) When the Source voltage is less the Bulk voltage B) When the Source voltage is equal to or greater the Bulk voltage C) When the Drain voltage is equal to the Bulk voltage D) When the Gate voltage is equal to the Bulk Voltage 

Last Answer : When does the Body bias effect occur in an n-channel MOSFET?  A) When the Source voltage is less the Bulk voltage B) When the Source voltage is equal to or greater the Bulk voltage C) ... voltage is equal to the Bulk voltage D) When the Gate voltage is equal to the Bulk Voltage 

Description : The effect of negative feedback on distortion and bandwidth is A) Both distortion and bandwidth get decreased B) Both distortion and bandwidth get increased C) Distortion is reduced and bandwidth is increased D) Distortion is increased and bandwidth is decreased 

Last Answer : The effect of negative feedback on distortion and bandwidth is Distortion is reduced and bandwidth is increased

Description : The skin effect in conductors is due to non uniform distribution of current in it and major portion of current is near the _______ of conductor.  (1) Surface (2) Center (3) Complete cross section area (4) Axis

Last Answer : The skin effect in conductors is due to non uniform distribution of current in it and major portion of current is near the Surface of conductor. 

Description : Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

Last Answer : Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

Description : The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Last Answer : The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

Description : The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

Last Answer : The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

Description : Skin effect occurs when a conductor carries current at_____ frequencies.

Last Answer : Skin effect occurs when a conductor carries current at high frequencies.

Last Answer : The chemical effect of current is used in D.C. ammeter hour meter.

Description : Diversity factor has direct effect on the?

Last Answer : Diversity factor has direct effect on the fixed cost of unit generated.

Description : Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Last Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

Description : What are the applications of Hall effect?

Last Answer : Hall effect transducer find application 8n instruments that measure magnetic field with small flux densities.

Description : explain skin effect in copper interconnects. what are the various ways of reducing this effect?

Last Answer : Skin effect generally observed in ac conductor in transmission network, in skin the current flowing through outer layer of conductor is more than iner area of conductor thus we can say the ... for reducing this effect we can use boundel conductor or used hollow conductor for power transmission

Description : when the skin effect occurs ?

Last Answer : skin effect is occur at higher frequencies when skin depth is smaller

Description : what is skin effect?

Last Answer : Skin effect is occurs in conductor due to high frequency...as the frequency increases the resistance of conductor increases...skin effect means the current flow through the skin of conductor....as the ... dc current their will be no skin effect...I hope you understand basic concept of skin effect

Last Answer : long, Medium Electricity Transportation In the system When Line Load Zero Or Low Load , then Acceptance On the edge Voltage Transmission Voltage Wait More Stay , him Ferranti Effect Says.

Description : When is the Ferranti effect on long over head lines experienced? a) The lines are lightly loaded b) The lines are heavily loaded c) The lines are fully loaded d) The power factor is unity

Last Answer : Ans: A

Description : What is Ferranti effect?

Last Answer : A: When receiving end voltage is greater than the sending end voltage.

Description : The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the (a) Seeback effect (b) Ferranti effect (c) Raman effect (d) none of the above

Last Answer : (b) Ferranti effect

Description : The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the (a) Seeback effect (b) Ferranti effect (c) Raman effect (d) none of the above

Last Answer : (b) Ferranti effect

Description : Ferranti effect in a transmission system is because of  (A) Inductive effect of transmission line (B) Capacitive effect of transmission line (C) Corona (D) Resistive effect of transmission line

Last Answer : Ferranti effect in a transmission system is because of Capacitive effect of transmission line

Description : Discuss the effect of transmission line parameters on the performance of transmission line .

Last Answer : Following are the effect on performance of transmission line:  1. Due to resistance (R), voltage drop in transmission line produces 2. Due to resistance (R), copper losses in ... voltage regulation of transmission line gets affected 7. Also power factor of transmission line gets affected

Description : State the meaning of FACTS and explain in brief d-types facts controller. 

Last Answer : Flexible AC Transmission System (FACTS):- A flexible alternating current transmission system (FACTS) is defined as it is a system composed of static equipment used for the AC transmission of ... so as to increase the transmittable active power. However, more reactive power must be provided.

Description : State the meaning of Single line diagram.

Last Answer : Meaning of Single line diagram: The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data ( ... breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols. 

Description : In aluminium conductors, steel core is provided to (a) compensate for skin effect (b) neutralise proximity effect (c) reduce line inductance (d) increase the tensile strength

Last Answer : (d) increase the tensile strength

Description : Explain the features of flexible AC transmission line (any four). State types of FACTS controller.

Last Answer : Features of flexible AC transmission line:-  1. FACTS increase the reliability of AC grids. 2. It controls the voltage under various load condition 3. It balance reactive power (both ... shunt compensation:- 1. Static synchronous compensator (STATCOM) 2. Static VAR compensator (SVC)

Description : State the limitations of EHVAC transmission line. 

Last Answer : Following are the Limitations of EHVAC Transmission:   1. Insulation cost increases as voltage increases 2. Skin effect is more 3. Proximity effect is more. 4. Corona loss increases. 5. Radio ... 18. EHVAC is economical only for bulk amount of power is to be transmitted over long distance. 

Description : Define Corona, List its causes and state how it can be avoided. 

Last Answer : Define Corona:  When AC Voltage given across two conductors separated by distance d' as shown figure is increased greater than breakdown voltage of air i.e. 30KV/cm, then air around the conductor gets ... e.g./ using ACSR, bundled conductor 3. By using smooth body conductor and hardware. 

Description : State the condition for selecting site for distribution substation. 

Last Answer : Following condition should be considered while selecting site for distribution sub-station:-  1. Near load center :  Sub-station should be located near load center to reduce cost of Transmission and ... free from earthquake :  To avoid damage to sub-station area should be free earth quake. 

Description : State the effects of low power factor on efficiency and voltage regulation of short transmission lines. 

Last Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor) 

Description : State advantages and disadvantages of radial distributor system. 

Last Answer : Advantages of radial distributor system: 1. Design of layout is simple. 2. Capital cost & Erecting cost is less as there is only one feeder. 3. Time required for completion of ... maintain supply to consumers when there is maintenance on feeder. 3. Voltage fluctuations are more.

Description : State the advantages of use of high voltage in transmission of Electric power. 

Last Answer : Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage.