Define pinch off voltage and drain resistance of FET.

Define pinch off voltage and drain resistance of FET.
by

1 Answer

Answer :

1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any effect on the value of ID. It is denoted by VP.   


2. Drain resistance : It is change in drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.

by

Related questions

Explain the principle of ON OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Description : Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Last Answer : The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.  

what is gate turn off thyristor (GTO)?

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

Last 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).

Define Depletion region and Barrier voltage of PN junction.

Description : Define Depletion region and Barrier voltage of PN junction.

Last Answer : 1. Depletion region : The region consisting of immobile positive charge at n-side and immobile negative charge at p-side near the junction acts like a barrier and prevents the further flow of ... charge formed at the p-n junction is called barrier voltage, barrier potential or junction barrier.

Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Description : Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Last Answer : Definition of parameters of OPAMP is follows:  i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.

Define with respect to FET:- (i) Static drain resistance (ii) Dynamic resistance (iii) Trans conductance (iv) Pinch-off voltage

Description : Define with respect to FET:- (i) Static drain resistance (ii) Dynamic resistance (iii) Trans conductance (iv) Pinch-off voltage

Last Answer : (i) Static drain resistance- It is the ratio of drain source voltage (ΔVDS) to the drain current (ID) at constant gate-source voltage. It can be expressed as, Rd = (VDS)/(ID) at ... of charge carrier and the value of drain current reaches its constant saturation value is called pinch off voltage.

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel...

Description : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

Last Answer : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

Compare BJT with FET

Description : Compare BJT with FET

Last Answer : FET BJT It is unipolar device i.e. current in the device is carried either by electrons or holes It is bipolar device i.e. current in the device is carried either by ... from minority- carrier storage effects & therefore has lower switching speeds & cut-off frequencies. 

Compare between BJT and FET on the basis of (i) Biolar/Unipolar (ii) Tharmal Runaway (iii) Noise (iv) Applications

Description : Compare between BJT and FET on the basis of (i) Biolar/Unipolar (ii) Tharmal Runaway (iii) Noise (iv) Applications

Last Answer : Parameter BJT FET Bipolar/Unipolar It is bipolar device i.e. current in this device is carried by electrons and holes. It is unipolar device i.e. current ... in oscilloscopes, electronic voltmeters and other measuring and testing equipment because of their high input impedance.

List different types of FET.

Description : List different types of FET.

Last Answer : Types of FETs:  1. Junction FET (JFET) i. N-Channel JFET ii. P-Channel JFET  2. MOSFET i. E-MOSFET ii. D-MOSFET 

State the application of FET

Description : State the application of FET

Last Answer : Applications of FET : * As input amplifiers in oscilloscopes, electronic voltmeters and other measuring and testing equipment because high input impedance reduces loading effect to the minimum. * As Constant ... Used as Analog switch. * As a Voltage Variable Resistor (VVR) in operational amplifiers.

An FET is a better chopper than a BJT because it has

Description : An FET is a better chopper than a BJT because it has (A) lower offset voltage (B) higher series ON resistance (C) lower input current (D) higher input impedance

Last Answer : An FET is a better chopper than a BJT because it has lower offset voltage

What is the difference between BJT and FET?

Description : What is the difference between BJT and FET?

Last Answer : BJT  is  a  current  opperated   transistor  while  FET   is  a  field   opperated  transistor.

Is the input impedance of MOSFET more than BJT and FET?

Description : Is the input impedance of MOSFET more than BJT and FET?

Last Answer : Yes, the input impedance of MOSFET more than BJT and FET.

How to Drain Your Sinuses

Description : How to Drain Your Sinuses

Last Answer : How to Drain Your Sinuses Stuffy nose or nasal congestion is not only caused by allergies. Infections, nonallergic rhinitis and structural problems may all lead to congestion. Here are some ways you ... animals. For more information regarding this article, read how to get rid of nasal congestion.

How to Unclog a Shower Drain

Description : How to Unclog a Shower Drain

Last Answer : How to Unclog a Shower Drain One of the worst things that can happen during your 15-minute morning shower is when you realize that the shower drain is clogged. It may seem like a minor annoyance at first, ... shower drain, you'll never have to take a shower in a pool of brown, murky water again.

How to Drain a Water Heater

Description : How to Drain a Water Heater

Last Answer : How to Drain a Water Heater Overtime, water heaters can accumulate sludge and other mineral deposits that settle from the water. This affects the heater's performance. To Solve this problem, you should make ... wants. By draining a water heater, you'll be assured to get this anytime you want.

How To Fix House Drain Pipe Leaks ?

Description : How To Fix House Drain Pipe Leaks ?

Last Answer : How To Fix House Drain Pipe Leaks How To Fix House Drain Pipe Leaks It is important to know the basics of plumbing before taking on the task of fixing house drainpipe leaks single-handedly. Plumbing ... wall between the joints. Tips and Warnings If the leak is major, call in a professional plumber.

How to Drain a Waterbed ?

Description : How to Drain a Waterbed ?

Last Answer : How to Drain a Waterbed Don't you just love sleeping on a waterbed? It's softer than your regular mattress and is just as comfy. Of course, like a normal bed, you must maintain your waterbed ... change and drain your waterbed's water and you'll always have a lovely, springy mattress to sleep on.

Pinch off voltage of a J FET is the drain to source voltage above which drain current.

Description : Pinch off voltage of a J FET is the drain to source voltage above which drain current. • Increases • Decreases • Remains constant • Becomes zero

Last Answer : Pinch off voltage of a J FET is the drain to source voltage above which drain current Remains constant

thyristor can be turned off by?

Description : thyristor can be turned off by?

Last Answer : Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.

How is the GTO turned off?

Description : How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse 

Last Answer : How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse 

The fuse blows off by?

Last Answer : The fuse blows off by melting.

SCR turned off when the anode current falls below?

Last Answer : SCR turned off when the anode current falls below holding current.

how can we turn on and turn off GTO?

Last Answer : GTO can be turned on by providing positive pulse to the gate terminal and it can be turn off by providing negative pulse to gate terminal.

can we turn off thyristor using Gate?

Last Answer : No we cannot turn off normal thyristor using Gate.

Define resistance with its unit.

Description : Define resistance with its unit.

Last Answer : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage.  Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency

Description : Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency

Last Answer : a) E.M.F : The electromotive force of a battery is defined as the energy spent or the work done in taking a unit positive charge around the complete circuit of the battery i.e., in ... input required to restore the initial state of charge, under specified conditions, is called Watt-hr efficiency.

Define: 1) Electrode 2) Electrolyte

Description : Define: 1) Electrode 2) Electrolyte

Last Answer : Electrode: An electrode is a small piece of metal or other substance that is used to take an electric current to or from the source of power.  Electrolyte: The substance which is ... electric current to pass through it, resulting in the chemical decomposition, is known as an electrolyte.  

Define earthing. State its types.

Description : Define earthing. State its types.  

Last Answer : Definition of earthing: * Earthing means connecting the metal body of electrical device to the general mass of earth by a wire of negligible resistance. OR * Earthing means connecting the metal body of ... ii) Pipe type earthing iii) Rod type earthing iv) Strip earthing v)Water main earthing

Define Resonance.

Description : Define Resonance. 

Last Answer : When the frequency of the external periodic force applied to a body is exactly equal to ( matches) natural frequency of body, the body vibrates with maximum amplitude, the effect is known as resonance 

Define Electrical Installation and give its classification.

Description : Define Electrical Installation and give its classification.

Last Answer : Meaning of Electrical installation : Electrical installation is a process of estimation and erection of electrical wiring with materials, and electrical machines used by ... Residential Electrical Installation ii) Commercial Electrical Installation iii) Industrial Electrical Installation 

Define laminar flow and turbulent flow.

Description : Define laminar flow and turbulent flow.

Last Answer : Laminar flow : When a fluid flowing through the pipe at different speeds (fast at center and slow at edges), and the fluid particles move in layers with one layer sliding over the adjacent ... successive cross sections, then this flow is called as turbulent flow. Reynolds no is greater than 4000 

Define transducer. Give two examples.

Description : Define transducer. Give two examples.

Last Answer : Transducer - It converts one form of signal into another form. A transducer is a device that is used to convert a physical quantity into its corresponding electrical signal.  Classification - 1. Active transducer 2. Passive transducer 

Define natural, mechanical, forced and induced draught systems.

Description : Define natural, mechanical, forced and induced draught systems.

Last Answer : Natural draught system: - When the fuel is burnt (combustion) in the furnace due to natural circulation of air, the draught is called natural draught. Mechanical draught system: -  In a mechanical ... combustion. OR If fan/blower is placed after the furnace then it is called as induced draught

Define the term solar constant.

Description : Define the term solar constant.

Last Answer : Solar energy arrived atmosphere at a constant rate of 1350W/M²

Define Q factor.

Description : Define Q factor.

Last Answer : Quality Factor: The quality factor basically represents a figure of merit of a component (practical inductor or capacitor) or a complete circuit. It is a dimensionless number and defined as: ... between two branches of the circuit to the current taken by the parallel circuit from the source.

Define balanced 3 phase load.

Description : Define balanced 3 phase load.

Last Answer : Balanced 3 phase Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts. It takes same current of equal magnitude and equal phase angle.

Define admittance and state its unit.

Description : Define admittance and state its unit.

Last Answer : Admittance is defined as the ability of the circuit to carry (admit) alternating current through it.  OR  It is the reciprocal of impedance Z. i.e Admittance Y = 1/Z.  Unit: Its unit is siemen (S) or mho (Ʊ).

Define :- (i) Accuracy (ii) Resolution

Description : Define :- (i) Accuracy (ii) Resolution

Last Answer : i) Accuracy: It is the closeness of an instrument reading with the true value of the quantity under measurement.  OR  It is defined as the ability of an instrument to respond to a ... can be detected with certainty by an intrument.  OR  Resolution is the smallest measurable input change

Define energy. Write unit of it.

Description : Define energy. Write unit of it.

Last Answer : Energy :-  Electrical energy is defined as the work done in moving electrical charge in electrical fields over specific time duration  OR  The total power delivered or consumed by consumer over specific time duration.  ... the power w.r.t. time  Unit :- Its Unit in watt sec., WHr., KWHr.

Define accuracy and precision

Description : Define accuracy and precision

Last Answer : 1) Accuracy: It is the closeness of an instrument reading with the true value of the quantity under measurement.  OR  It is defined as the ability of a instrument to respond to a true value ... is a measure of the degree of agreement within a group of a measurement of the same quantity. 

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

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 

Define gain and bandwidth of an amplifier.

Description : Define gain and bandwidth of an amplifier.

Last Answer : Bandwidth  The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A

Define negative and positive feedback

Description : Define negative and positive feedback

Last Answer : 1. Negative feedback: Feedback in which feedback signal is out of phase with input signal and it decreases output is called negative feedback.  2. Positive feedback: Feedback in which feedback signal is in phase with input signal and it increases output is called positive feedback. 

Define biasing of transistor

Description : Define biasing of transistor

Last Answer : Biasing of transistor is the process that makes the base emitter junction of transistor always forward biased and collector junction reverse biased for achieving the faithful amplification .

Define load and line regulation.

Description : Define load and line regulation.

Last Answer : 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as:  % Load regulation = (VNL-VFL) / VFL *100  ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.  

Define ripple factor and PIV of diode.

Description : Define ripple factor and PIV of diode.

Last Answer : 1. Ripple factor: It is define as ratio of R.M.S. value of AC component to the DC component in the output.  2. PIV : It is maximum reverse voltage that diode can withstand without destroying junction.

Define following : i. Radix ii. Bit iii. Nibble iv. Byte

Description : Define following : i. Radix ii. Bit iii. Nibble iv. Byte

Last Answer : i. Radix- the base to a given number system is called as radix.  ii. Bit- Single ‗1‘ or ‗0‘ is called as a bit.  iii. Nibble- a group of 4 bits is called as nibble  iv. Byte- a group of 8 bits is called as a byte.

Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Description : Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Last Answer : Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field.  OR  A line of ... that the tangent at any point gives direction of the resultant force at that point. 

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage

Description : A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

Last Answer : A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52