What is the difference between BJT and FET?

What is the difference between BJT and FET?
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1 Answer

Answer :

BJT  is  a  current  opperated   transistor  while  FET   is  a  field   opperated  transistor.
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Related questions

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.

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

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.

State the difference between energy conservation and energy audit.

Description : State the difference between energy conservation and energy audit. 

Last Answer : energy conservation Energy audit It is reducing the growth of energy consumption by avoiding unnecessary usage of energy It is an inspection, survey & analysis of energy flows ... Various measuring instruments, with proper sensing elements are required for the energy audit. 

Describe the difference between direct and alternating current.

Description : Describe the difference between direct and alternating current.

Last Answer : Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

Describe the difference between an open circuit and a short circuit.

Description : Describe the difference between an open circuit and a short circuit.

Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Write difference between absolute & secondary instrument.

Description : Write difference between absolute & secondary instrument.

Last Answer : Absolute Instrument Secondary Instrument 1. These give magnitude of quantity in terms physical constants of instruments 1. These give reading directly of the quantity at the time of ... Raleigh current balance. 6. Examples - ammeter, voltmeter, amperehour meter, wattmeter etc.

What is the difference between relay and contactor?

Description : What is the difference between relay and contactor?

Last Answer : Relay have smaller ratings. Contactor is a high rating relay.

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last Answer : In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

A differential relay measures the vector difference between?

Last Answer : A differential relay measures the vector difference between two or more similar electrical quantities.

What is the difference between an AC and DC generator?

Description : What is the difference between an AC and DC generator?

Last Answer : The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

What is the difference between synchronous and asynchronous motors?

Description : What is the difference between synchronous and asynchronous motors?

Last Answer : The motor which rotates at constant speed is called synchronous motor. And that constant speed is called as synchronous speed.  And the motor which does not rotates at constant speed are called asynchronous motor. Asynchronous motor is also called as Induction motor.

What is the difference between eddy current and hysteresis loss?

Description : What is the difference between eddy current and hysteresis loss?

Last Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

What is the difference between an anode and a cathode?

Description : What is the difference between an anode and a cathode?

Last Answer : The anode is positively charged electrode and the cathode is negatively charged electrode.

What is the difference between an insulator and a dielectric?

Description : What is the difference between an insulator and a dielectric?

Last Answer : Dielectric is the another name for insulator.

What is the difference between a microcontroller and a microprocessor?

Description : What is the difference between a microcontroller and a microprocessor?

Last Answer : Compare microprocessor and microcontroller Microprocessor Microcontroller 1)Inbuilt RAM and ROM 1)Do not have inbuilt RAM or ROM 2)Inbuilt timer 2)Doesn't have inbuilt timer ... same memory 6)Many Multifunction pins on the IC  6)less multifunction Pins on IC.

What is the difference between AC and DC drive?

Description : What is the difference between AC and DC drive?

Last Answer : AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

What is the difference between line and phase current?

Description : What is the difference between line and phase current?

Last Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

What is the difference between line and phase voltage?

Description : What is the difference between line and phase voltage?

Last Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

What is difference between KW and KVA?

Description : What is difference between KW and KVA?

Last Answer : kW is kilowatt and kVA is kilovolt ampere. kW is unit of real power and kVA is unit of Apparent power.

What is difference between Star and Delta Connection?

Description : What is difference between Star and Delta Connection?

Last Answer : Star is        1. Open ckt       2. At center point present  neutral   Delta is     1.   Closed ckt 2.      Neutral not present in this case 

What is the difference between a counter and a timer?

Description : What is the difference between a counter and a timer?

Last Answer : Counter counts only when the trigger is applied and timer counts continuously with some equal delay.

What is the difference between renewable and nonrenewable energy sources?

Description : What is the difference between renewable and nonrenewable energy sources?

Last Answer : Renewable energy sources are non-perishable, and Non-renewable energy sources are perishable sources. Non-Renewable energy sources are like  coal, oil,nuclear fuel etc. Renewable energy sources are :- wind, solar, tidal, Geo thermal etc.

What is the difference between a switch and a relay?

Description : What is the difference between a switch and a relay?

Last Answer : Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

What is the difference between a coil and an inductor?

Description : What is the difference between a coil and an inductor?

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

What is the difference between forward and reverse bias?

Description : What is the difference between forward and reverse bias?

Last Answer : Forward bias is a PN junction bias which allows current to flow through the junction. Forward bias decreases the resistance of the depletion layer. Reverse bias is a PN junction bias that allows only ... Positive polarity on the n-type material and negative polarity to the p-type material.

If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be

Description :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

Last Answer :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98 

What is a BJT amplifier?

Description : What is a BJT amplifier?

Last Answer : Bilpolar Juntion transistor , this fuction is control the current

Distinguish between AC and DC.

Description : Distinguish between AC and DC.

Last Answer : Particulars Direct Current Alternating Current Definition It is the current whose magnitude and direction do not change with respect to time. It is the current whose ... system, electroplating, Battery charging, Traction. AC machines, Domestic and industrial supply.

Give the circuit analysis of current source inverter with resistive load.

Description : Give the circuit analysis of current source inverter with resistive load. What are the main difference between voltage source inverter and current source inverter?

Last Answer : Current source inverter (CSI): In current source inverter, the output current is independent of load. The input current of current source inverter is constant. Current source converter converts DC input current to ... are connected in parallel. In CSI diodes are connected in series.

what is the different between AC and DC current ?

Description : what is the difference between AC and DC current ?

Last Answer : AC is generated using Alternator. DC is generated using DC generator. AC changes its direction periodically. DC do not change its direction periodically. AC have non zero frequency. DC have zero ... Power factor of AC is between 0 and 1. But power factor of DC is always 1.

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.

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 

State 2 advantages of JFET over BJT.

Description : State 2 advantages of JFET over BJT.

Last Answer : Advantages of JFET over BJT: 1) High input impedance 2) Better thermal stability 3) Produce less noise 4) Smaller than BJT 5) Rugged in construction and simpler to fabricate 6) High degree of isolation between Input and Output. 

List specification of BJT.

Description : List specification of BJT.

Last Answer : * The bipolar junction transistor (BJT) has small signal current gain, α (hfb). * Maximum collector current Ic (max). * Maximum collector to emitter voltage, VCE (max). * Collector to emitter ... . * Collector to emitter cut off voltage, VCEO. * Base emitter saturation voltage, VBE (sat).

State reason BJT is called as bipolar junction transistor.

Description : State reason BJT is called as bipolar junction transistor.

Last Answer : BJT is called bipolar junction transistor because in BJT current conduction takes place due to majority as well as minority charge carriers.

List configurations of BJT.

Description : List configurations of BJT. 

Last Answer : Configurations of BJT : 1) Common Base (CB) configuration 2) Common Emitter (CE) configuration 3) Common Collector (CC) configuration

State the need of biasing of BJT.

Description : State the need of biasing of BJT.

Last Answer : Need of biasing: The basic need of transistor biasing is to keep the base-emitter (B-E) junction properly forward biased and the collector-emitter (C-E) junction properly reverse biased ... transistor biasing is necessary for normal and proper operation of transistor to be used for amplification. 

Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.

Description : Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.

Last Answer : Two advantages of voltage divider biasing of BJT. 1. It is very simple method of transistor biasing. 2. The biasing conditions can be very easily set. 3. there is no loading of ... 5. The resistor RE introduces a negative feedback. So all the advantages of negative feedback are obtained. 

Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ?

Description : Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown

Last Answer : Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown

What is a BJT?

Description : What is a BJT?

Last Answer : Bipolar Junction Transistor (BJT): BJT is a Bipolar device. (Uses both electrons and holes charge carrier for current conduction) Two Junctions (Emitter junction & collector ... mode (Current amplification) Cutoff mode (Open switch) Saturation mode (Close switch)

Explain open emitter BJT drive circuit.

Description : Explain open emitter BJT drive circuit.

Last Answer : open emitter BJT drive circuit:

Explain the formation of parasitic BJT and parasitic diode in Power MOSFET.

Description : Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?

Last Answer : Parasitic Diode: The parasitic diode is in between drain and source. The MOSFET structure itself contains parasitic diode or body drain diode. This parasitic diode allows the reverse flow of current when the ... of MOSFET as a BJT collector. Parasitic BJT operates in the cut-off region.

Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.

Description : Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.

Last Answer : Power MOSFET have high turning on and turning off capability high switching speed of MOSFET is due to the high rate of change of drain voltage. The switching losses of power MOSFET ... lower frequency. Hence, operating frequency of power MOSFET is higher than that of power BJT.

Compare BJT, MOSFET and IGBT .

Description : Compare BJT, MOSFET and IGBT .

Last Answer : BJT MOSFET IGBT BJT is a current controlled device. MOSFET is a voltage controlled device. IGBT is a voltage controlled device. The input impedance of BJT is low. ... is minority carrier device. MOSFET is majority carrier device. IGBT is minority carrier device.

is IGBT costlier than BJT and MOSFET?

Last Answer : Yes IGBT is costlier than BJT and MOSFET.

does the BJT have internal capacitance?

Last Answer : Yes BJT have internal capacitances.

in which region BJT act as a switch?

Last Answer : BJT act as switch in saturation and  cutoff region ( ON state in saturation region and OFF state in cut-off region )