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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 :

factors to be considered while designing feeders ? 

Answer :

Following factors are to be considered while designing the Feeder:  1) Current carrying capacity of conductor:- Conductor should have high current carrying capacity. While voltage drop consideration is ... time consuming.  5) Power Factor of load should be consider while designing

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Description :

Why inductor current lags inductor voltage ?

Answer :

Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor

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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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Description :

Explain design constraint of filter inductor design.

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Description :

Explain the iterative inductor design procedure. Show the design procedure flowchart.

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Description :

Explain the various steps involved in designing a custom single-purpose processor.

Answer :

A single purpose processor is a digital circuit designed to execute exactly one program. It is also known as co-processor, accelerator or peripheral. It contains only ... for small quantities. Performance may not match general-purpose processors for same applications.

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Description :

Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.

Answer :

Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).

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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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Description :

Draw a symbol and neat labeling V-I characteristics of GTO and explain its operation.

Answer :

Ans: Symbol and V-I characteristics of GTO: Operation of GTO: i) As the applied anode to cathode voltage is increased above zero, very small current (leakage current) flows through the device. ... low voltage (VBRR). The reverse breakdown voltage is of the order of 20 to 30 volt only. 

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Description :

Draw a neat labelling V-I characteristics of SCR and explain the region

Answer :

(i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed.  (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state. 

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Description :

Explain the electrical characteristics of transformer.

Answer :

Transformer electrical characteristics: Area of primary and secondary conductors, Apri and Asec: Winding loss Pw: Flux density and core loss: Leakage inductance: ... transformer span. The rise in temperature may breakdown insulation which may cause failure of the transformer.

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Answer :

The best software for Circuit designing is  Proteus

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Description :

An inductor is connected in series with SCR to protect it from A) Excessive high voltage B) Excessive high dv/dt C) Excessive high di/dt D) Excessive large forward current 

Answer :

An inductor is connected in series with SCR to protect it from Excessive high di/dt

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Description :

Explain the factors to be considered while designing a lighting scheme.

Answer :

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Description :

Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC

Answer :

(i) LASCR:  (ii) DIAC:  (iii) TRIAC: 

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Description :

What are the desirable characteristics of ideal switch?

Answer :

Desirable characteristics of the ideal switch: It is desirable to have power switches characteristics closer to ideal switch. The ideal switch should have the following characteristics. Zero resistance when ... . 100% efficiency. Able to control power flow with zero power dissipation.

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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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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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Answer :

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

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Description :

State the applications and specification of (i) Resistor (ii) Capacitor (iii)Inductor

Answer :

Application of resistor: 1.Resistors are used in high frequency instrument. 2.Resistor is used in power control circuit. 3.It is used in DC power supplies. 4.Resistors are used ... DC Current  3.Electromagnetic Interference (EMI)  4.Magnetic Saturation Flux Density  5.Curie Temperature 

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Description :

An inductor of Q factor 10 is connected in series with a capacitor having a Q factor of 100. The overall Q factor of the circuit is :  (A) 100/11 (B) 11/100 (C) 110 (D) 1000

Answer :

An inductor of Q factor 10 is connected in series with a capacitor having a Q factor of 100. The overall Q factor of the circuit is : 100/11

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Description :

What is back EMF in inductor?

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Description :

What are the types of power losses in inductor?

Answer :

Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

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Description :

What is the difference between a coil and an inductor?

Answer :

Inductor is covering with insulating material is called coil.so they differentiate between coil and inductor.

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Description :

Explain the characteristics of solar cell.  

Answer :

Characteristics of solar cell : Explanation :- Solar cells produce direct current ( DC ) electricity and current times voltage equals power, so we can create solar cell I-V curves representing ... system so that it can operate as close to its optimal peak power point (MPP) as possible.

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Description :

Following factors are to be considered while designing a distributor

Answer :

1. While designing the distributor voltage drop calculation is important. 2. Voltage drop in distribution system should be maintained within permissible limit (  6%). 3. Layout should ... 14. Fault on nearest distribution system should not affect stability of existing distribution system. 

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Description :

Which set of learner characteristics may be considered helpful in designing effective teaching-learning systems? Select the correct alternative from the codes given below: (i) Prior experience of learners in respect of the subject. (ii) Interpersonal relationships of learner's family friends. (iii) Ability of the learners in respect of the subject. (iv) Student's language background. (v) ... i), (iii), (iv) and (vi) (C) (ii), (iii), (iv) and (v) (D) (iii), (iv), (v) and (vi)

Answer :

Answer: B 

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Answer :

https://youtu.be/fgQTs-1hq7Q

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Description :

Diode VI characteristics

Answer :

Diode VI characteristics

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Description :

 basic characteristics of sound signal.

Answer :

Level and loudness: The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. The loudness of a ... the reproducing system should be capable of handling the maximum and minimum power in the same ratio. 

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Description :

Compare characteristics of asynchronous and synchronous transmission mode (four points). 

Answer :

Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.

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Description :

State characteristics of force.

Answer :

i) Magnitude: The quantity of force e.g. 10 N, 100 kN etc.  ii) Direction: It is the line along which the force acts. It is also called as line of action of the force.  iii) Point of ... .  Push: If the arrow head is pointed towards the point of application, the nature of the force is push.

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Description :

List three important characteristics of an electric circuit.

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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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Description :

The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

Answer :

The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

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Description :

The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

Answer :

The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator

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Description :

Which of the following does not show non-linear V-I characteristics? (A) Schottky diode (B) Tunnel diode (C) Thermistor, at a fixed temperature (D) p-n Junction diode.

Answer :

Which of the following does not show non-linear V-I characteristics? (A) Schottky diode (B) Tunnel diode (C) Thermistor, at a fixed temperature (D) p-n Junction diode.

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Answer :

The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.

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Answer :

The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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Description :

What are the characteristics of a capacitor?

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Description :

Write short notes on:  1) Phosphor characteristics  2) Liquid crystal display

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Description :

A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current decreases.

Answer :

The question seems to be wrong. Increase in frequency would actually decrease the current through the Inductor. This happens because inductive reactance Xl is directly proportional to frequency. And if frequency increases the value of Xl would ... vice versa. Xl= 2*pi*f*L I=E/Z Z=sqrt(R^2+Xl^2)

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Description :

Temperature controller using SCR

Answer :

Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.

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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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Description :

Answer :

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.

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Description :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Answer :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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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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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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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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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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