SCR is more utilized as compared to Triac because it is

SCR is more utilized as compared to Triac because it is
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SCR is more utilized as compared to Triac because it is available with higher ratings

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Related questions

Compare SCR and TRIAC

Description : 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.

With neat sketch explain four modes of operation of a TRIAC?

Description : 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. 

Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC

Description : Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC

Last Answer : (i) LASCR:  (ii) DIAC:  (iii) TRIAC: 

Speed control of the motor using TRIAC

Description : 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.

Draw the symbol of GTO and TRIAC.

Description : Draw the symbol of GTO and TRIAC.

Last Answer : 1) GTO: 2) TRIAC: 

Can we use triac in multiquadrant chopper?

Last Answer : Yes, we can use triac in the multi-quadrant chopper.

Describe triggering circuit for TRIAC using DIAC.

Description : Describe triggering circuit for TRIAC using DIAC.

Last Answer : Triggering circuit for TRIAC using DIAC: DIAC stands for diode alternating current. It's a two terminal four layer bidirectional device. It conducts in both directions. DIAC is used for triggering TRIAC. ... of DIAC to the gate terminal of TRIAC reduces the harmonics.

Explain triggering of SCR using opto-coupler. State its advantages.

Description : 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.

Draw the circuit diagram of battery charger using SCR and explain it’s working.

Description : 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.

Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.

Description : 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. 

Explain working of AC circuit breaker using SCR with circuit diagram.

Description : 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.

Temperature controller using SCR

Description : 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.

Describe triggering of SCR using UJT relaxation oscillator.

Description : Describe triggering of SCR using UJT relaxation oscillator. 

Last Answer : I need it's operation

How GTO is advantages over SCR

Description : 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. 

Draw a neat labelling V-I characteristics of SCR and explain the region

Description : 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. 

Draw construction of SCR using two transistor model. Explain its operation.

Description : Draw construction of SCR using two transistor model. Explain its operation.

Last Answer : Two Transistor Model of SCR or Thyristor

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc

Description : 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

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load,

Description : 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

An SCR without any external connections is considered as

Description : 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

Is a SCR a thyristor?

Description : Is a SCR a thyristor?

Last Answer : Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.

Is SCR unidirectional switch?

Last Answer : Yes, SCR is a unidirectional switch.

SCR turned off when the anode current falls below?

Last Answer : SCR turned off when the anode current falls below holding current.

What is holding current and latching current in SCR ?

Description : 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.

What is the use of SCR?

Description : 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.

What is TRIAC?

Description : 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

Purpose of Selective Catalytic Reduction (SCR)

Description : 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%.

An inductor is connected in series with SCR to protect it from

Description : 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

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

Description : 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

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR

Description : 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

Triac are usually operated at:

Description : Triac are usually operated at:

Last Answer : Triac are usually operated at: power frequency

A triac is a device which acts as a

Description : A triac is a device which acts as a  A) Diode in forward direction and thrylistor in the reverse direction B) Thyristor in both directions C) Diode in both directions D) Thyristor in forward direction and diode in reverse direction

Last Answer : A triac is a device which acts as a Thyristor in both directions

Turn on time of an SCR can be reduced by using a:

Description : Turn on time of an SCR can be reduced by using a:

Last Answer : Turn on time of an SCR can be reduced by using a: Rectangular pulse of high amplitude and narrow width

During forward blocking state, the SCR has:

Description : During forward blocking state, the SCR has:

Last Answer : During forward blocking state, the SCR has: low voltage, large current

A thyristor (SCR) turns off when the

Description : A thyristor (SCR) turns off when the  A) Gate pulse is removed B) Gate pulse is applied C) Thyristor current is below holding value D) Anode voltage is made negative

Last Answer : A thyristor (SCR) turns off when the Thyristor current is below holding value

Turn-on of a thyristor (SCR) takes place when

Description : Turn-on of a thyristor (SCR) takes place when  A) Anode to cathode voltage is positive B) Anode to cathode voltage is negative C) Positive current is applied to gate D) Anode to cathode voltage is positive and positive current pulse is applied to gate

Last Answer : Turn-on of a thyristor (SCR) takes place when Anode to cathode voltage is positive and positive current pulse is applied to gate

Circuit turn-off time of an SCR is defined as the time

Description : Circuit turn-off time of an SCR is defined as the time  (A) taken by the SCR turn to be off (B) required for the SCR current to become zero (C) for which the SCR is reverse biased by the commutation circuit (D) for which the SCR is reverse biased to reduce its current below the holding current

Last Answer : Circuit turn-off time of an SCR is defined as the time for which the SCR is reverse biased by the commutation circuit 

An SCR can only be turned off via it's

Description : An SCR can only be turned off via it's   (A) cathode (B) anode (C) gates (D) none

Last Answer : An SCR can only be turned off via it's anode 

An SCR starts conducting with appreciable current when

Description : An SCR starts conducting with appreciable current when

Last Answer : An SCR starts conducting with appreciable current when anode and gate both are positive

After firing as SCR, the gating pulse is removed. The current in the SCR will

Description : After firing as SCR, the gating pulse is removed. The current in the SCR will  1. remain the same 2. immediately fall to zero 3. rise up 4. None 

Last Answer : After firing as SCR, the gating pulse is removed. The current in the SCR will remain the same

Surge current rating of an SCR specifies the maximum

Description : Surge current rating of an SCR specifies the maximum  (a) Repetitive current with sine wave (b) Non-repetitive current with sine wave (c) Non-repetitive current with rectangular wave (d) Repetitive current with rectangular wave  

Last Answer : Surge current rating of an SCR specifies the maximum Non-repetitive current with sine wave

Turn-on time of an SCR in series with RL circuit can be reduced by

Description : Turn-on time of an SCR in series with RL circuit can be reduced by   (a) Increasing circuit resistance R (b) Decreasing R (c) Increasing circuit inductance L (d) Decreasing L 

Last Answer : Turn-on time of an SCR in series with RL circuit can be reduced by Decreasing L 

parallel operation of mosfet can be done more easily as compared to thyristor. why?

Description : 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.

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

Description : 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

A triac thyristor functions as a control device and is basically ________________. A. two NPN transistors in parallel with a common base lead B. a diode in series with a temperature sensitive capacitor C. two back-to-back SCR's with a common gate lead D. a triode tube with an extra heavy grid element

Description : A triac thyristor functions as a control device and is basically ________________. A. two NPN transistors in parallel with a common base lead B. a diode in series with a temperature sensitive capacitor C. two ... -back SCR's with a common gate lead D. a triode tube with an extra heavy grid element

Last Answer : Answer: C

Figure 'A' of the diagram shown in the illustration represents a/an ____________. EL-0078 A. silicon controlled rectifier B. IG or MOS field effect transistor C. triac thyristor D. junction field effect transistor

Description : Figure 'A' of the diagram shown in the illustration represents a/an ____________. EL-0078 A. silicon controlled rectifier B. IG or MOS field effect transistor C. triac thyristor D. junction field effect transistor

Last Answer : Answer: B

When used for ac current control, during which alternation of the ac cycle does the TRIAC control current flow?

Description : When used for ac current control, during which alternation of the ac cycle does the TRIAC control current flow?

Last Answer : During both alternations.

The TRIAC is similar in operation to what device?

Description : The TRIAC is similar in operation to what device?

Last Answer : SCR

When a Triac is properly gated, what is/are the direction(s) of current flow between anodes 1 and 2?

Description : When a Triac is properly gated, what is/are the direction(s) of current flow between anodes 1 and 2?

Last Answer : Current is allowed to flow in either direction.

TRIAC

Description : What is TRIAC ?

Last Answer : TRIAC is three terminal semiconductor device for controlling current. TRIAC is bidirectional device. TRIAC is use for AC switching applications because it can control the current flow over both halves of ... as convenient for some high power applications where its switching is more difficult.

A Triac is a - - - power switch

Last Answer :  A Triac is a Bi-directional power switch