Explain thyristor gate drive circuit.
Last 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.
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3.0k views
1 answer
asked
Feb 19, 2018
by
anonymous

basic gate drive circuit of GTO
Last Answer : basic gate drive circuit of GTO
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896 views
1 answer
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Nov 14, 2017
by
anonymous

Justify. Power MOSFET is operated at high enough gate source voltage to minimize the conduction losses.
Last 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.
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842 views
1 answer
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Dec 7, 2017
by
anonymous

What are the fundamental requirements of gate drive ICs?
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112 views
0 answers
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Mar 11, 2018
by
anonymous

Describe the gate circuit for a single phase full converter.
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71 views
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Mar 11, 2018
by
anonymous

Explain open emitter BJT drive circuit.
Last Answer : open emitter BJT drive circuit:
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262 views
1 answer
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Feb 19, 2018
by
anonymous

Explain DC coupled drive circuit with unipolar output.
Last Answer : DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms
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515 views
1 answer
asked
Feb 19, 2018
by
anonymous

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
Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only
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193 views
1 answer
asked
Apr 29, 2018
by
anonymous
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Draw full bridge & half bridge configuration with common cathode.
Last Answer : Half Bridge Configuration: Full Bridge Configuration:
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309 views
1 answer
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Oct 13, 2019
by
anonymous

Explain different gate drives techniques with base circuits and key features.
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560 views
0 answers
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Mar 10, 2018
by
anonymous

Explain switching model of MOSFET.
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75 views
0 answers
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Mar 10, 2018
by
anonymous

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.
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2.6k views
1 answer
asked
Feb 6, 2018
by
anonymous

Explain difference between enhancement MOSFET and depletion type MOSFET.
Last 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
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548 views
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Nov 14, 2017
by
anonymous

Explain the series and parallel operation of MOSFET. Which is suitable and why?
Last 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.
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534 views
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Sep 15, 2017
by
anonymous

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).
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1.7k views
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Aug 8, 2017
by
anonymous

Describe with neat sketch the construction and working principle of MOSFET.
Last 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.
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3.5k views
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Jul 25, 2019
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anonymous

State the applications of MOSFET
Last 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
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87 views
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Jul 25, 2019
by
anonymous

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
Last 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
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314 views
1 answer
asked
Apr 28, 2018
by
anonymous
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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
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3.2k views
1 answer
asked
Apr 28, 2018
by
anonymous

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.
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983 views
1 answer
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Feb 3, 2018
by
anonymous

Justify the statement. Antiparallel diode is connected across MOSFET.
Last 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.
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160 views
1 answer
asked
Feb 2, 2018
by
anonymous

parallel operation of MOSFET can be done more easily as compared to thyristor. why?
Last 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.
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300 views
1 answer
asked
Dec 7, 2017
by
anonymous

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.
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448 views
1 answer
asked
Nov 10, 2017
by
anonymous

Last Answer : Because it has a higher switching frequency and heat tolerance.
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143 views
1 answer
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Sep 15, 2017
by
anonymous

What is depletion type MOSFET?..........
Last 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.
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188 views
1 answer
asked
Sep 15, 2017
by
anonymous

What is enhancement MOSFET?...............
Last 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.
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175 views
1 answer
asked
Sep 15, 2017
by
anonymous

Last Answer : ON state losses of IGBT is less as compared to MOSFET and BJT.
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141 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last 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.
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201 views
1 answer
asked
Sep 10, 2017
by
anonymous

Last Answer : already answered here is mosfet current controlled device?
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172 views
1 answer
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Sep 10, 2017
by
anonymous

Last Answer : MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.
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114 views
1 answer
asked
Sep 10, 2017
by
anonymous

Draw O/P characteristics of CB configuration and explain its working.
Last 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.
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197 views
1 answer
asked
May 2, 2020
by
anonymous

In relation to embedded Linux how TCP/IP networking is done? Explain network configuration.
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61 views
0 answers
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Mar 19, 2018
by
anonymous

Sketch output characteristics of CE configuration. Show all the regions.
Last Answer : Sketch output characteristics of CE configuration. Show all the regions.
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1 answer
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Jul 24, 2019
by
anonymous

Compare between CB , CE & CC transistor configuration.
Last 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°
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111 views
1 answer
asked
Sep 4, 2018
by
anonymous

Why common emitter configuration is commonly used?
Last 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.
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172 views
1 answer
asked
Sep 4, 2018
by
anonymous

Which configuration has the lowest current gain ?
Last Answer : Common base configuration has the lowest current gain.
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104 views
1 answer
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Mar 8, 2018
by
anonymous

Explain transformer isolated drive circuits providing both signal and power.
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0 answers
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Mar 11, 2018
by
anonymous

What is the need for electrically isolated drive circuits?
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65 views
0 answers
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Mar 11, 2018
by
anonymous

Draw circuit diagram of symmetrical configuration of bridge converter.
Last Answer : circuit diagram of symmetrical configuration of bridge converter
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83 views
1 answer
asked
May 21, 2020
by
anonymous

Pole Climbing & Attention to Street Light, Jumpers & Insulator Checking & Replacement of Insulator?
Last Answer : Ans. (a) Before pole climbing, supply to be disconnected (b) While climbing safety belt, helmet to be used. (c) While attending street light, safety board to be displayed. (d) While providing jumpers ... non-essential (g) Essential loads to be brought to single point. (h) Then connect UPS supply.
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6 views
1 answer

How to Rig a Fishing Pole
Last Answer : How to Rig a Fishing Pole Fishing can be a really exciting outdoor experience, not just a nap in the middle of a lake while holding a complicated stick. Rigging a fishing pole ... these steps, you can prepare your fishing equipment properly for a weekend afternoon of recreation and relaxation.
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1 answer
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How to Build a Pole Barn ?
Last Answer : How to Build a Pole Barn How to Build a Pole Barn One of the simplest installations that you can make in your property is a pole barn. Usually found on agricultural land, a pole barn ... . Pond construction is also helpful if you want to add some extra features for your small household farm.
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5 views
1 answer
asked
May 9, 2021
by
anonymous

With a neat sketch give the working of shaded pole induction motor.
Last Answer : Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.
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265 views
2 answers
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Apr 27, 2020
by
anonymous
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State two applications of 1) Shaded pole motor 2) Universal motor
Last Answer : (i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.
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125 views
1 answer
asked
Jul 26, 2019
by
anonymous

A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is
Last Answer : A 50 Hz, 4 pole turboalternator rated at 20 MVA. 13.2 KV has an inertia constant H = 4 KW sec/KVA. The K.E. stored in the rotor at synchronous speed is 80 MJ
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1.5k views
1 answer
asked
May 3, 2018
by
anonymous

Last Answer : Locked rotor current of a shaded pole motor is slightly more than full load current.
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85 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The shaded pole motor is used for low starting torque.
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63 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
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339 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : A shaded pole motor can be used for toys, hair dryers, circulators etc.
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103 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.
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120 views
1 answer
asked
Mar 20, 2018
by
anonymous
