The FET and the vacuum tube have what in common?

The FET and the vacuum tube have what in common?
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1 Answer

Answer :

Voltage controls conduction.
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Related questions

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

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

Last Answer : Source-to-drain resistance increases.

What is the key to FET operation?

Description : What is the key to FET operation?

Last Answer : Effective cross-sectional area of the channel.

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

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

Last Answer : Gate.

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

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

Last Answer : High input impedance.

When designing vacuum-tube circuits, what characteristics of tubes must be taken into consideration?

Description : When designing vacuum-tube circuits, what characteristics of tubes must be taken into consideration?

Last Answer : Differences in performance of tubes of the same type

Name the components which greatly increase the weight of vacuum-tube circuitry.

Description : Name the components which greatly increase the weight of vacuum-tube circuitry.

Last Answer : Transformers, capacitors, and resistors.

What discovery proved to be the foundation for the development of the vacuum tube?

Description : What discovery proved to be the foundation for the development of the vacuum tube?

Last Answer : The Edison Effect.

Name two functions of the base of a vacuum tube.

Description : Name two functions of the base of a vacuum tube.

Last Answer : It serves as a mounting for the tube elements and as the terminal connectio

On the diagram below, name the elements of the vacuum tube and their potentials relative to dc ground. time is an example of what type of transmission?

Description : On the diagram below, name the elements of the vacuum tube and their potentials relative to dc ground. time is an example of what type of transmission?

Last Answer : a. Plate, positive. b. Suppressor grid, negative.

Why do electrons cross the gap in a vacuum tube?

Description : Why do electrons cross the gap in a vacuum tube?

Last Answer : because the negatively charged electrons are attracted to the positively cha

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

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.

What is the most common cause of electron tube failure?

Description : What is the most common cause of electron tube failure?

Last Answer : Open filaments

How did vacuum tubes cause a problem for first generation computers

Description : How did vacuum tubes cause a problem for first generation computers

Last Answer : They were unreliable, required a lot of power to run, and produced so much heat that air conditioning was needed to protect computer parts.

In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?

Description : In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?

Last Answer : Integrated circuits.

Vacuum tubes are designed to operate in what portion of the Ep - Ip

Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip

Last Answer : The linear portion.

What is the full form of FET ?

Description : What is the full form of FET ?

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

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 ?

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.

Why is input impedance of the FET very high?

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.

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

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.

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

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

State the classifications of FET devices.

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).

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

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

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

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

State any two applications of FET.

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. 

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

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

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

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).

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.

Comparison of BJT and FET

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

construction of P-channel J-FET.

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. 

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

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. 

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

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

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.

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.

Define pinch off voltage and drain resistance of FET.

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.

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 

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

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

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

A FET is preferred over an ordinary transistor because it

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 

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

A FET is essentially a - - - - driven device

Last Answer : A FET is essentially a Voltage driven device

A FET is a - - - transistor

Last Answer : A FET is a Bi-polar transistor

In an FET _______

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

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.

What are the advantages of 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).

What was the name of the first vacuum tube invented by Lee de Forrest in 1906 ?

Description : What was the name of the first vacuum tube invented by Lee de Forrest in 1906 ?

Last Answer : The first vacuum tube invented by Lee de Forrest in 1906 was called Audion.

Who invented the first vacuum tube ?

Description : Who invented the first vacuum tube ?

Last Answer : Edison was the first to invent a vacuum tube.

What does a vacuum tube do ?

Description : What does a vacuum tube do ?

Last Answer : The vacuum tube acts as a rectifier

The Third Generation Computer was made with . A) Vacuum Tube B) Discrete Components C) IC D) Bio Chips

Description : The Third Generation Computer was made with . A) Vacuum Tube B) Discrete Components C) IC D) Bio Chips

Last Answer : Answer : C