Why SCR is called as thyristor?
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Mar 19, 2018
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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May 21, 2020
by
anonymous

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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535 views
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May 21, 2020
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
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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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936 views
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Oct 13, 2019
by
anonymous

Temperature controller using SCR
Last Answer : Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.
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412 views
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Oct 13, 2019
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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Oct 13, 2019
by
anonymous

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

How GTO is advantages over SCR
Last Answer : i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off.
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Oct 13, 2019
by
anonymous
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Draw a neat labelling V-I characteristics of SCR and explain the region
Last Answer : (i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed. (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state.
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Jul 25, 2019
by
anonymous

Draw construction of SCR using two transistor model. Explain its operation.
Last Answer : Two Transistor Model of SCR or Thyristor
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Jul 25, 2019
by
anonymous

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz
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Jun 18, 2018
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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Apr 29, 2018
by
anonymous

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
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Apr 28, 2018
by
anonymous

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses
Last Answer : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses
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Apr 28, 2018
by
anonymous

An SCR without any external connections is considered as (A) two diodes in series (B) three diodes in series (C) two n-p-n transistors in series (D) two p-n-p transistors in series
Last Answer : An SCR without any external connections is considered as three diodes in series
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Apr 28, 2018
by
anonymous

Last Answer : Yes, SCR is a unidirectional switch.
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Mar 6, 2018
by
anonymous

Last Answer : SCR turned off when the anode current falls below holding current.
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Mar 6, 2018
by
anonymous

What is holding current and latching current in SCR? Draw the gate characteristics of an SCR and explain the characteristics. What are the different signals which can be used for turning on SCR by gate control? compare them.
Last Answer : (i) Holding Current: Holding current is defined as the minimum anode current required to maintain conducting SCR in the on-state. (ii) Latching Current: Latching current is defined as the ... the on-state immediately after the SCR has been turned on and the gate signal has been removed.
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Feb 3, 2018
by
anonymous

What is the use of SCR?
Last Answer : SCR are use in lamp dimming, power regulators, motor control, rectifications of high power AC, control of welding machines and also use as switch these are some uses of silicon controlled rectifier.
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Dec 9, 2017
by
anonymous

Thyristor can be protected from over voltages by using
Last Answer : Thyristor can be protected from over voltages by using Voltage clamping device
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May 8, 2018
by
anonymous

Leakage current flows through the thyristor in
Last Answer : Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.
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May 8, 2018
by
anonymous

What is a phase control thyristor?
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Mar 19, 2018
by
anonymous

Why thyristor are not preferred for inverter?
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Mar 19, 2018
by
anonymous

What is thyristor family?
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Mar 19, 2018
by
anonymous

What is meant by firing angle of thyristor?
Last Answer : The point at which SCR is triggered is known as firings angle of thyristor.
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Mar 19, 2018
by
anonymous

What is the use of a thyristor in a circuit?
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Mar 19, 2018
by
anonymous

What is a reverse conducting thyristor?
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Mar 19, 2018
by
anonymous

What is the function of a thyristor?
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Mar 19, 2018
by
anonymous

How is a thyristor used to convert AC to DC?
Last Answer : thyristor
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1 answer
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Mar 19, 2018
by
anonymous
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What is the application of thyristor?
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Mar 19, 2018
by
anonymous

Last Answer : Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain
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Mar 6, 2018
by
anonymous
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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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asked
Feb 19, 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
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Dec 7, 2017
by
anonymous

what are the disadvantages of thyristor?
Last Answer : Disadvantages of thyristor The silicon controlled rectifier (SCR) is unidirectional devices, so it can control power only in DC power during positive half cycle of AC supply. Thus only DC power is ... cycle. It cannot be used at higher frequencies. The gate current cannot be negative
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886 views
2 answers
asked
Dec 6, 2017
by
anonymous

write short notes on thyristor CSI .
Last Answer : Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.
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2 answers
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Nov 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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asked
Aug 8, 2017
by
anonymous

drive the expression for the (1)current that commutates the scr, (2)the peak current, (3) conduction time? in class B,C,D and E.
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Purpose of Selective Catalytic Reduction (SCR)
Last Answer : Purpose of Selective Catalytic Reduction (SCR) : 1. It reduces Nox 75% to 90% 2. Converts it in to molecular nitrogen and water vapor 3. It reduces HC emission up to 80% 4. It reduces PM emission 20 to 25%.
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Jan 2, 2021
by
anonymous
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An inductor is connected in series with SCR to protect it from A) Excessive high voltage B) Excessive high dv/dt C) Excessive high di/dt D) Excessive large forward current
Last Answer : An inductor is connected in series with SCR to protect it from Excessive high di/dt
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Jun 18, 2018
by
anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) ... proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α
Last Answer : The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ
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150 views
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asked
Apr 28, 2018
by
anonymous

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell
Last Answer : In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching
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Apr 28, 2018
by
anonymous

How do you test an SCR?
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Mar 15, 2018
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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1 answer
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May 3, 2020
by
anonymous

Last Answer : By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.
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Sep 21, 2017
by
anonymous

Last Answer : Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor.
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Sep 21, 2017
by
anonymous

Last Answer : No we cannot turn off normal thyristor using Gate.
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1 answer
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Sep 21, 2017
by
anonymous
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Last Answer : Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.
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Sep 21, 2017
by
anonymous

Last Answer : Thyristor have three terminals anode, cathode and Gate.
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Sep 21, 2017
by
anonymous

thyristor can be turned off by?
Last Answer : Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.
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asked
Sep 10, 2017
by
anonymous
