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

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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

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. 

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198 views 1 answer
Description :

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

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. 

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73 views 1 answer
Description :

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

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. 

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66 views 1 answer
Description :

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

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:

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582 views 1 answer
Description :

What is the smallest unit of a compound with the same chemical characteristics?

Answer :

The molecule is the smallest unit of a compound with the same chemical characteristics.

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98 views 1 answer
Description :

Explain the characteristics of inductor to be considered while designing it. What is the effect of over current and increase in temperature on inductor.

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Description :

Skin effect occurs when a conductor carries current at_____ frequencies.

Answer :

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

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69 views 1 answer
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

Answer :

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

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108 views 1 answer
Description :

Eddy current damping cannot be used for moving iron instrument because

Answer :

Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

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2.2k views 1 answer
Description :

What type of meter is used to measure current?

Answer :

Ammeter

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2.7k views 3 answers
Description :

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

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.

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190 views 1 answer
Description :

Explain in brief ‘Hall effect sensor’. 

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 

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99 views 2 answers
Description :

Explain magnetic effect employed in measuring instrument.

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. 

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81 views 1 answer
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 

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 

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77 views 1 answer
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

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

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136 views 1 answer
Description :

What is meant by body effect in MOSFET?

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57 views 0 answers
Description :

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

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

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Description :

Piezo-electric effect

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

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45 views 1 answer
Description :

 State the disadvantages of skin effect.

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) 

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43 views 1 answer
Description :

State the meaning of ferranti effect and proximity effect.  

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 ... on conductor causes current in each conductor is re-distributed. This is known as proximity effect.

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14 views 1 answer
Description :

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

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.  

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33 views 1 answer
Description :

List out factors affecting proximity effect. 

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 

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48 views 1 answer
Description :

Under Following conditions Ferranti effect occurs: 

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.

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50 views 1 answer
Description :

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.

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67 views 1 answer
Description :

State seeback effect. Describe the working of thermocouple.

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. 

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59 views 1 answer
Description :

What is piezoelectric effect? Name two piezoelectric material.

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

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57 views 1 answer
Description :

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

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 

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166 views 1 answer
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 

Answer :

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

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95 views 1 answer
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

Answer :

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

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143 views 1 answer
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.

Answer :

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

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Description :

Answer :

Effect of a force on a body depends upon magnitude, direction, position or line of action.

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Description :

Answer :

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

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Description :

What are the applications of Hall effect?

Answer :

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

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129 views 2 answers
Description :

when the skin effect occurs ?

Answer :

skin effect is occur at higher frequencies when skin depth is smaller

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82 views 1 answer
Description :

what is skin effect?

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

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230 views 2 answers
Description :

what is Ferranti effect?

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.

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98 views 1 answer
Description :

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

Answer :

In a single-phase transformer, the magnetizing current is in phase with the flux in the core

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Description :

Answer :

Alternating current is measured by induction ammeter.

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Description :

Answer :

The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.

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180 views 1 answer
Description :

Answer :

A direct current can be measured by a D.C. potentiometer in conjunction with a standard resistance.

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Description :

Answer :

For measuring current at high frequency we should use thermocouple instrument.

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Description :

Answer :

The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

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218 views 1 answer
Description :

Answer :

An induction meter can handle current up to 100 A.

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90 views 1 answer
Description :

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Answer :

Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

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Description :

Answer :

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

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2.5k views 1 answer
Description :

How can a magnetic field be used to generate an electric current?

Answer :

Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

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Description :

Explain why potential difference is necessary to produce current in a circuit.

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Description :

In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Answer :

In a series R-C circuit, with the increase in frequency, current Increases

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Description :

Leakage current flows through the thyristor in

Answer :

Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.

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178 views 1 answer
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

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179 views 1 answer
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