Description : Explain thyristor gate drive circuit.
Answer :
Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.
asked
Feb 19, 2018
by
anonymous
Description : basic gate drive circuit of GTO
Answer :
basic gate drive circuit of GTO
asked
Nov 14, 2017
by
anonymous
Description : What are the fundamental requirements of gate drive ICs?
asked
Mar 11, 2018
by
anonymous
Description : Justify. Power MOSFET is operated at high enough gate source voltage to minimize the conduction losses.
Answer :
MOSFET is metal oxide field effect transistor. MOSFET is a voltage controlled device. MOSFET is majority carrier device. MOSFET are of two one is n-channel MOSFET and p-channel MOSFET. Gate, ... . Hence, power MOSFET is operated at high enough gate-source voltage to minimize the conduction losses.
asked
Dec 7, 2017
by
anonymous
Description : Explain open emitter BJT drive circuit.
Answer :
open emitter BJT drive circuit:
asked
Feb 19, 2018
by
anonymous
Description : Explain DC coupled drive circuit with unipolar output.
Answer :
DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms
asked
Feb 19, 2018
by
anonymous
Description : Describe the gate circuit for a single phase full converter.
asked
Mar 11, 2018
by
anonymous
Description : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents
Answer :
The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only
asked
Apr 29, 2018
by
anonymous
Description : Explain transformer isolated drive circuits providing both signal and power.
asked
Mar 11, 2018
by
anonymous
Description : Draw full bridge & half bridge configuration with common cathode.
Answer :
Half Bridge Configuration: Full Bridge Configuration:
asked
Oct 13, 2019
by
anonymous
Description : Explain different gate drives techniques with base circuits and key features.
asked
Mar 10, 2018
by
anonymous
Description : Draw O/P characteristics of CB configuration and explain its working.
Answer :
In common base configuration, emitter is the input terminal, collector is the output terminal and base terminal is connected as a common terminal for both input and output. The base-emitter ... In this region, a small collector current flows called leakage current when emitter current is zero.
asked
May 2, 2020
by
anonymous
Description : In relation to embedded Linux how TCP/IP networking is done? Explain network configuration.
asked
Mar 19, 2018
by
anonymous
Description : Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?
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.
asked
Feb 6, 2018
by
anonymous
Description : Explain difference between enhancement MOSFET and depletion type MOSFET.
Answer :
In enhancement MOSFET channel is not initially exists but in depletion MOSFET channel is already exists. In case of depletion MOSFET if the voltage is applied between drain and source the drain current will flow ... a channel. depletion MOSFET & enhancement MOSFET
Description : Explain the series and parallel operation of MOSFET. Which is suitable and why?
Answer :
Series operation of MOSFET: To increase voltage handling capability MOSFETs are connected in series. When the MOSFETs are connected in series each MOSFET should turn on and turn off ... on and turn off time and transconductance. Each MOSFET should share current equally.
asked
Sep 15, 2017
by
anonymous
Description : Explain switching model of MOSFET.
asked
Mar 10, 2018
by
anonymous
Description : What is the need for electrically isolated drive circuits?
asked
Mar 11, 2018
by
anonymous
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).
Description : Sketch output characteristics of CE configuration. Show all the regions.
Answer :
Sketch output characteristics of CE configuration. Show all the regions.
asked
Jul 24, 2019
by
anonymous
Description : Compare between CB , CE & CC transistor configuration.
Answer :
Parameter CB CE CC I/P impedance Low Or 50Ω Medium Or 600Ωto 4kΩ High Or 1 MΩ Current Gain Less than or equal to 1 High Highest Voltage Gain Medium Medium Less ... k Ω to 50 k Ω Low Or 50 Ω Phase shift between input and output 0° 360° 0°
asked
Sep 4, 2018
by
anonymous
Description : Why common emitter configuration is commonly used?
Answer :
Common emitter configuration is commonly used for amplifications because 1. The common emitter configuration (CE) provides maximum voltage and current gain and hence provides maximum power gain. The ... automatic impedance matching maximum power transfer will take place from one stage to other.
asked
Sep 4, 2018
by
anonymous
Description : Which configuration has the lowest current gain ?
Answer :
Common base configuration has the lowest current gain.
asked
Mar 8, 2018
by
anonymous
Description : Describe with neat sketch the construction and working principle of MOSFET.
Answer :
Construction and working principle of MOSFET: A) Depletion type MOSFET: Construction: The N-channel depletion type MOSFET is formed on P-type silicon substrate with two heavily ... accumulation of electrons and hence more current. Thus the MOSFET is a gate voltage controlled device.
asked
Jul 25, 2019
by
anonymous
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
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
asked
Apr 28, 2018
by
anonymous
Description : Compare BJT, MOSFET and IGBT .
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.
asked
Nov 10, 2017
by
anonymous
Answer :
Because it has a higher switching frequency and heat tolerance.
asked
Sep 15, 2017
by
anonymous
Answer :
ON state losses of IGBT is less as compared to MOSFET and BJT.
asked
Sep 13, 2017
by
anonymous
Description : Draw circuit diagram of symmetrical configuration of bridge converter.
Answer :
circuit diagram of symmetrical configuration of bridge converter
asked
May 21, 2020
by
anonymous
Description : State the applications of MOSFET
Answer :
Applications of MOSFET: i) Switching-mode-power-supplies (SMPS) and linear power supplies. ii) Brushless DC motor drives iii) Solid state DC relay iv) Automobile applications v) Stepper motor controller vi) Lighting controls vii) Solenoid drivers viii) Robotics ix) Induction heating
asked
Jul 25, 2019
by
anonymous
Description : The threshold voltage of an n- channel enhancement mode MOSFET is 0.5V when the device is biased at a gate voltage of 3V. Pinch off would be occurs at a drain voltage of (A) 1.5V (B) 2.5V (C) 3.5V (D) 4.5V
Answer :
The threshold voltage of an n- channel enhancement mode MOSFET is 0.5V when the device is biased at a gate voltage of 3V. Pinch off would be occurs at a drain voltage of 2.5V
asked
Apr 28, 2018
by
anonymous
Description : Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.
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.
asked
Feb 3, 2018
by
anonymous
Description : Justify the statement. Antiparallel diode is connected across MOSFET.
Answer :
In MOSFET current is flow from drain to source but when the load is inductive the current may flow in opposite direction. To avoid the opposite flow of current and to protect MOSFET the antiparallel diode is connected across MOSFET.
Description : parallel operation of MOSFET can be done more easily as compared to thyristor. why?
Answer :
Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.
asked
Dec 7, 2017
by
anonymous
Description : What is depletion type MOSFET?..........
Answer :
Depletion MOSFET: Depletion MOSFET is a MOSFET in which the channel already exists. If we apply a voltage between drain and source then the drain current will flow even if the gate to source ... in figure. The drain current will be reduced as the gate to source voltage made more negative.
asked
Sep 15, 2017
by
anonymous
Description : What is enhancement MOSFET?...............
Answer :
Enhancement MOSFET: There are two types of MOSFET one is enhancement MOSFET and second is depletion MOSFET. In enhancement MOSFET channel is created by applying threshold voltage between gate and source ... mode. The enhancement MOSFET will not conduct if the gate to source voltage is zero.
asked
Sep 15, 2017
by
anonymous
Answer :
No, MOSFET is not the curent controlled device. The current between drain and source which is drain current is controlled by applying a voltage between gate and source hence MOSFET is a voltage controlled device.
asked
Sep 10, 2017
by
anonymous
Answer :
already answered here is mosfet current controlled device?
asked
Sep 10, 2017
by
anonymous
Answer :
MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.
asked
Sep 10, 2017
by
anonymous
Description : The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Answer :
The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
asked
Mar 18, 2018
by
anonymous
Description : What is the difference between AC and DC drive?
Answer :
AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz
asked
Mar 10, 2018
by
anonymous
Description : Function of OR Gate its logical symbol and truth table.
Answer :
Function: - OR gate is used to perform logical addition. So used in adder subtractor and logic circuits where logical Oring is required. Used to implement SOP form equations. Also used in PLA logic. Logical symbol of OR gate :- Truth table:-
asked
May 26, 2020
by
anonymous
Description : Sketch symbol of NAND gate and NOR gate.
Answer :
Symbol of NAND gate and NOR gate
asked
Jul 24, 2019
by
anonymous
Description : What does the AND gate do?
Answer :
AND gate multiple two inputs. If any one input is zero output will be zero if both inputs are one then only output is one.
asked
Dec 15, 2017
by
anonymous
Description : Adjustable-speed drive
Answer :
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asked
Jul 6, 2019
by
anonymous
Description : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
Answer :
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
asked
Apr 28, 2018
by
anonymous
Answer :
For constant torque drive armature voltage control speed control method is preferred.
asked
Mar 20, 2018
by
anonymous
Description : What is an electric motor drive?
asked
Mar 10, 2018
by
anonymous
Description : What is a drive in electrical controls?
asked
Mar 10, 2018
by
anonymous
Description : What does an electric drive do?
asked
Mar 10, 2018
by
anonymous