Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC
Last Answer : (i) LASCR: (ii) DIAC: (iii) TRIAC:
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1.3k views
1 answer
asked
Oct 13, 2019
by
anonymous

With neat diagram explain synchronized UJT triggering circuit.
Last Answer : Line Synchronized UJT triggering circuit: The UJT is almost ideal as a firing device for SCRs. There are 2 main reasons for the compatibility between UJTs and SCRs. Firstly, the UJT produces a ... , the SCR is sure to have the right polarity between the anode and cathode for turning on.
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567 views
1 answer
asked
May 21, 2020
by
anonymous

Describe triggering of SCR using UJT relaxation oscillator.
Last Answer : I need it's operation
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575 views
2 answers
asked
Oct 13, 2019
by
anonymous

Explain the operation of RC triggering circuit with neat diagram.
Last Answer : RC triggering circuit: The RC half-wave triggering circuit is as shown in the figure. During negative halfcycle of supply voltage vs, the capacitor C charges through diode D2 and load, ... be triggered at 0° & 180° because the supply voltage is zero and less than finger voltage.
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3.5k views
1 answer
asked
Jul 25, 2019
by
anonymous

Speed control of the motor using TRIAC
Last Answer : Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.
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270 views
1 answer
asked
Oct 13, 2019
by
anonymous

Explain triggering of SCR using opto-coupler. State its advantages.
Last Answer : Triggering of SCR using opto-coupler: A simple opto-coupler based triggering circuit for SCR is shown in the figure. An optocoupler or opto-isolator is a combination of light source ... is small size and light weight device. iii)Interfacing with logic circuits is easily possible.
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327 views
1 answer
asked
May 21, 2020
by
anonymous

Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Last Answer : Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.
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368 views
1 answer
asked
May 3, 2020
by
anonymous

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
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7.8k views
3 answers
asked
Jun 29, 2019
by
anonymous

With neat sketch explain four modes of operation of a TRIAC?
Last Answer : Modes of operation of a TRIAC: There are four different operating modes of TRIAC: 1) MT2 and gate are positive with respect to terminal MT1(Mode1) : Here terminal MT2 is positive ... junction P2-N2 is forward biased, current carriers are injected and therefore, the TRIAC is turned on.
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442 views
1 answer
asked
May 21, 2020
by
anonymous

Compare SCR and TRIAC
Last Answer : SCR TRIAC It is an unidirectional device. It is a bidirectional device. It is turned-on by only positive gate current. It can be turned-on by either ... applications including lamp dimmer, heating control, zero voltage switched AC relay, small AC motor control etc.
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132 views
1 answer
asked
Oct 13, 2019
by
anonymous

Draw the symbol of GTO and TRIAC.
Last Answer : 1) GTO: 2) TRIAC:
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584 views
1 answer
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Jul 25, 2019
by
anonymous

SCR is more utilized as compared to Triac because it is
Last Answer : SCR is more utilized as compared to Triac because it is available with higher ratings
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88 views
1 answer
asked
Apr 29, 2018
by
anonymous

Last Answer : Yes, we can use triac in the multi-quadrant chopper.
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219 views
1 answer
asked
Mar 6, 2018
by
anonymous

Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last Answer : Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on.
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220 views
1 answer
asked
May 21, 2020
by
anonymous

Define triggering. List the type of triggering.
Last Answer : Triggering: Triggering means turning-ON of a device from its OFF-state. Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) ... (i) D.C. Gate triggering (ii) A.C. Gate triggering (iii) Pulse Gate triggering
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95 views
1 answer
asked
Jul 25, 2019
by
anonymous

Which triggering is the most reliable?
Last Answer : Gate triggering is most reliable.
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466 views
1 answer
asked
May 8, 2018
by
anonymous

Last Answer : Yes DIAC can conduct in both direction.
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69 views
1 answer
asked
Sep 20, 2017
by
anonymous

what is DIAC?
Last Answer : DIAC is a two terminal and four layer device most DIAC have three terminals. DIAC stands for diode for alternating current. It conducts in both direction. It is also used for triggering triac.
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110 views
1 answer
asked
Aug 6, 2017
by
anonymous

How do you test a triac?
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48 views
0 answers
asked
Mar 15, 2018
by
anonymous

What is TRIAC?
Last Answer : TRIAC Structure: Operating Principle: A triac is a three terminal, five layer semiconductor device. It is equivalent to two separate SCRs connected in anti-parallel with gates common. ... for electric fans and other electric motors. v. Heating control vi. Zero voltage switched relay
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200 views
3 answers
asked
Aug 6, 2017
by
anonymous

Light triggering is mainly used in
Last Answer : Light triggering is mainly used in High voltage direct current transmission
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441 views
1 answer
asked
May 8, 2018
by
anonymous

RC triggering is preferred over resistance triggering because (A) it provides triggering at a precise instant (B) it gives a longer duration gate pulse (C) it enables triggering at a larger value of firing angle (D) it protects the SCR against high dv/dt
Last Answer : a
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4.7k views
2 answers
asked
Apr 28, 2018
by
anonymous

microproject on synchronised UJT triggring circuit
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9 views
0 answers
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What is one of the craziest things you've ever tried to describe or explain to someone?
Last Answer : Trump’s election.
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1 view
1 answer
asked
Mar 1
by
anonymous

Describe with neat sketch working of hysteresis motor.
Last Answer : Working: When stator is energized with single phase ac supply, rotating magnetic field is produced because of starting (auxiliary) and main windings, which remain in circuit permanently. The ... the principle of magnetic locking this motor either rotates at synchronous speed or not at all.
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203 views
1 answer
asked
May 7, 2020
by
anonymous

State the various lighting calculations methods and Describe any one of them.
Last Answer : Lighting calculation methods: 1. Lumens or Light flux method 2. Point to point or Inverse Square law method 3. Watts per Square meter method i) Lumens or Light ... is taken according to the illumination desired on an average value considering overall efficiency of the lighting system.
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227 views
1 answer
asked
May 3, 2020
by
anonymous

With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.
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231 views
1 answer
asked
May 2, 2020
by
anonymous

Describe strain gauge with labelled diagram.
Last Answer : A Strain gauge is a sensor whose resistance varies with applied force. It converts force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured. When external ... to the applied strain. So, the voltmeter can be calibrated in terms of strain or force.
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175 views
1 answer
asked
May 2, 2020
by
anonymous

Describe the concept of virtual ground with reference to op-Amp.
Last Answer : Virtual ground concept:-In circuit point A is virtual ground. Figure shows inverting amplifier using op-amp. In this circuit non-inverting terminal is connected to the actual ground. Due to ... zero potential without actually grounding is known as virtual ground concept. Circuit diagram:
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184 views
2 answers
asked
May 2, 2020
by
anonymous
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Briefly describe the electric field of a static charge.
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82 views
0 answers
asked
Jun 29, 2019
by
anonymous

Draw and describe working of electronic energy meter.
Last Answer : working of electronic energy meter:- 1. CT reduces current to reasonable value for current scaling network. 2. Voltage & current scaling networks reduce proportionally the voltage & ... The ADC converts the square wave frequency analog output to display the energy in watthour.
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133 views
1 answer
asked
Sep 6, 2018
by
anonymous

Describe operation of N-channel JFET
Last Answer : Operation of N-channel JFET 1) When VGS = 0 volt: When a voltage is applied between the drain and source with a DC supply voltage VDD with VGS = 0 V, the electrons flow from source ... to zero. The gate to source voltage at which current reduces to zero is called as pinch-off voltage.
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173 views
1 answer
asked
Sep 5, 2018
by
anonymous

Describe the various blocks and their functions in pipelined ADC architecture.
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85 views
0 answers
asked
Mar 2, 2018
by
anonymous

Describe the basic SHA operation with the help of its four mode specifications.
Last Answer : Sample-and-hold amplifier (SHA) is a unity gain amplifier with a mode control switch where the input of the amplifier is connected to a time-varying signal. A trigger pulse at the mode control switch ... but other forms, such as optical and mechanical forms, are possible. Also denoted S/H.
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114 views
1 answer
asked
Mar 2, 2018
by
anonymous

Describe the gate circuit for a single phase full converter.
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71 views
0 answers
asked
Mar 11, 2018
by
anonymous
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Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.
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537 views
1 answer
asked
May 21, 2020
by
anonymous

Explain working of AC circuit breaker using SCR with circuit diagram.
Last Answer : AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
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937 views
1 answer
asked
Oct 13, 2019
by
anonymous

Figure 'D' shown in the illustration represents a/an ____________. EL-0078 A. DIP IC chip B. integrated diac/triac envelope C. TO-5 flat pack D. 7-segment BCD display
Last Answer : Answer: A
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1 view
1 answer

Explain working of static AC circuit breaker.
Last Answer : Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
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209 views
1 answer
asked
May 21, 2020
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

Draw circuit diagram of Class B commutation.
Last Answer : Class B: Resonant Pulse Commutation:
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116 views
1 answer
asked
May 21, 2020
by
anonymous

Which circuit is used as amplitude comparator?
Last Answer : Schmitt trigger circuit is used as amplitude comparator.
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370 views
1 answer
asked
May 3, 2018
by
anonymous

What is the use of a thyristor in a circuit?
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2.9k views
0 answers
asked
Mar 19, 2018
by
anonymous

Explain MOSFET gate drive circuit and totem pole configuration.
Last Answer : MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.
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348 views
1 answer
asked
Feb 19, 2018
by
anonymous

Explain open emitter BJT drive circuit.
Last Answer : open emitter BJT drive circuit:
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262 views
1 answer
asked
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

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
asked
Nov 14, 2017
by
anonymous

explain blanking times for Bridge circuit?
Last Answer : Blanking time is provided by driver circuit to power switch. Blanking time is important because the turn on input of one transistor must be delayed with turn off input of another transistor if both ... are connected in one converter leg. This blanking time helps in avoiding cross conduction.
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142 views
1 answer
asked
Sep 19, 2017
by
anonymous

Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.
Last Answer : Sinusoidal Steady-State Analysis - Using nodal analysis, find node voltages in the circuit.
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172 views
1 answer
asked
Apr 3, 2020
by
anonymous
