What is the key to FET operation?

1 Answer

Answer :

Effective cross-sectional area of the channel.

Related questions

Description : Applying a reverse bias to the gate of an FET has what effect?

Last Answer : Source-to-drain resistance increases.

Description : The base of a transistor serves a purpose similar to what element of the FET

Last Answer : Gate.

Description : The FET and the vacuum tube have what in common?

Last Answer : Voltage controls conduction.

Description : What is one of the primary advantages of the FET when compared to the bipolar transistor?

Last Answer : High input impedance.

Description : An FET has a gate source bias of 2 V. The ac input signal is ± 1.2 V. The class of operation is A) A B) B C) C D) AB

Last Answer : D) AB

Description : What is the full form of FET ?

Last Answer : The full name of FET is Field effect Transistor

Description : my adopted son has adhd and is Bipolar mixed and I have had him in and out of physc wards since he was 12, now he is 16,and failing 9th grade and apparently doesnt care.talking doesnt work taking things away ie, tv,phone privaleges,etc , Im also fet up ?

Last Answer : Bipolar disorder is a very serious MEDICAL condition, and cannot be treated by taking away phone and TV privileges. Your son is in serious need of help; seek out a well-regarded specialist A.S.A.P.

Description : Why is input impedance of the FET very high?

Last Answer : BECAUSE its input circuit (gate to source) is reverse biased and input gate current is very small.

Description : why the bjt is known as current controlled device and fet is known as voltage controlled device ?

Last Answer : Ans- 1. In BJT because of the current the output will vary. 2. Where as in FET by means of Voltage the output is varied.

Description : State the classifications of FET devices.

Last Answer : FET is classified as 1. Junction Field Effect Transistor (JFET) 2. Metal oxide semiconductor family (MOS).

Description : In a transistor, the conventional current flows from base to emitter. The transistor is (a) NPN (b) PNP (c) FET (d) None of these

Last Answer : (a) NPN

Description : A semiconductor device made up of a single p-n Junction is called a: w) transistor x) diode y) Fet z) integrated circuit

Last Answer : ANSWER: X -- DIODE

Description : State any two applications 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. 

Description : State and explain the working principle of FET amplifier and list its applications.

Last Answer : Operation of FET amplifier: When small a.c. signal is applied to the gate, it produces variation in the gate to source voltage. This results in variation in the drain current. As ... input voltage.  Application: Buffer amplifier Low noise amplifier Cascade amplifier Chopper amplifier

Description : Draw the drain characteristics of p-channel FET and explain.

Last Answer : Drain characteristics:- As VDS is increased from zero as shown , ID will increased proportionally through the p channel. In this region the channel resistance is constants because the depletion region is ... the depletion layer. (i.e. channel width zero) is called cutoff voltage or VGS(off).

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.

Description : Sketch circuit diagram of common source FET Amplifier. State working principle of it.

Last Answer : Working: -  * When small a.c. signal is applied to the gate, it produces variation in the gate to source voltage. This produces variation in the drain current. As the gate to source ... and we get amplification. Thus the AC output voltage VDS is 180º out of phase with AC input voltage.

Description : Comparison of BJT and 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 both ... is comparatively more noisy. It is relatively immune to radiation. It is susceptible to radiation

Description :  construction of P-channel J-FET.

Last Answer : Construction of P-channel J-FET : The construction diagram of P channel junction field effect transistor (JFET) is shown in above figure. It consist of a P type silicon ... enter the semiconductor bar and Source (S) is a terminal through which the electrons leave the semiconductor. 

Description : Explain N-channel J-FET with its transfer characteristics.

Last Answer : Working of Channel JFET: Working: 1. The application of negative gate voltage and positive drain voltage with respect to source, reverse biases the gate- source junction of an N-channel JFET. 2. When a ... symbol VP or VGS(OFF) . The value of VP is negative for N-channel JFET. 

Description : Differentiate between N-channel and P-channel J-FET.

Last Answer : N-Channel JFET P-Channel JFET 1.The current conduction takes place due to electrons 1.The current conduction takes place due to holes. 2.Its switching speed and cut off ... It is most widely used in circuit applications 5.It is comparatively less used in circuit applications

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.

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. 

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.

Description : Define pinch off voltage and drain resistance of FET.

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

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 

Description : The gain of an FET amplifier can be changed by changing: (1) rm (2) gm (3) Rd (4) None of these

Last Answer : The gain of an FET amplifier can be changed by changing: gm

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

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 

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

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

Last Answer : A FET is essentially a Voltage driven device

Last Answer : A FET is a Bi-polar transistor

Last Answer : In an FET One junction has reverse bias on both sides of the junction.

Description : What is the difference between BJT and FET?

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

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.

Description : What are the advantages of FET?

Last Answer : FET is a constant current device which is controlled by voltage. By varying the input voltage we can control the output current. There are basically two types of FET one is MOSFET and second is JFET . ... as compare to BJT. These are some advantages of FET (Field Effect Transistor).

Description : List the key operational parameters used to define receiver performance.

Last Answer : Receiver sensitivity, bandwidth, and dynamic range.

Description : Name the modulation system in which the frequency alternates between two discrete values in response to the opening and closing of a key?

Last Answer : . Frequency-shift keying.

Description : The field arrangements in waveguides are divided into what two categories to describe the various modes of operation?

Last Answer : Transverse electric (TE) and transverse magnetic (TM).

Description : What amplifier class of operation is the most inefficient but has the least distortion?

Last Answer : Class A.

Description : What two primary items determine the class of operation of an amplifier?

Last Answer : The amount of bias and the amplitude of the input signal

Description : Once ionization has occurred in a thyratron, what control does the control grid have over the tube’s operation?

Last Answer : None.

Description : What type of clock is used when more than one operation is to be completed during one clock cycle?

Last Answer : . A multiphase clock.

Description : What is the sign of operation for the X-OR gate?

Last Answer : XOR

Description : What type of bias is required for proper operation of a photodiode?

Last Answer : Reverse bias.

Description : The TRIAC is similar in operation to what device?

Last Answer : SCR

Description : What type of diagram is the most useful in learning the overall operation of a system?

Last Answer : A schematic diagram.

Description : What is the effect on magnetron operation if the magnetic field strength is too high?

Last Answer : The magnetron will not oscillate.

Description : What is the effect on magnetron operation if the magnetic field strength is too high?

Last Answer : The magnetron will not oscillate.

Description : What are the required radar inputs for proper indicator operation?

Last Answer : Triggers, video, and antenna information.