Surge current rating of an SCR specifies the maximum

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  
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Answer :

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

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Related questions

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

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.

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.

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.

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

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

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

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

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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

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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

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

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SCR is more utilized as compared to Triac because it is

Description : 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

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

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

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An SCR without any external connections is considered as

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Is a SCR a thyristor?

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Is SCR unidirectional switch?

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What is the use of SCR?

Description : What is the use of SCR?

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Once SCR starts conducting a forward current, its gate losses control over

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Holding current for an SCR is best described as:

Description : Holding current for an SCR is best described as:  (1) The minimum current required for turn-off (2) The current required before an SCR will turn on (3) The amount of current required to maintain conduction (4) The gate current required to maintain conduction

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