For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have

For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have 

 (a) short rise time with pulse width = 3 µsec (b) long rise time with pulse width = 6 µsec (c) short rise time with pulse width = 6 µsec (d) None of the above 
by

1 Answer

Answer :

a
by

Related questions

Since the characteristics of the device shown in figure 'A' of the illustration includes a stable voltage and low current while operating, it can be suitably used in _____________. EL-0065 A. oscillators and SCR trigger circuits B. class A and B amplifiers C. generator rectifier and filtering supplies D. all of the above

Description : Since the characteristics of the device shown in figure 'A' of the illustration includes a stable voltage and low current while operating, it can be suitably used in _____________. EL-0065 A. oscillators ... . class A and B amplifiers C. generator rectifier and filtering supplies D. all of the above

Last Answer : Answer: A

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

The circuit shown in the illustration functions as a ____________. EL-0087 A. pulse trigger circuit for an operational amplifier B. three stage, high gain class 'A' amplifier C. binary ripple counter or shift register D. free running multivibrator

Description : The circuit shown in the illustration functions as a ____________. EL-0087 A. pulse trigger circuit for an operational amplifier B. three stage, high gain class 'A' amplifier C. binary ripple counter or shift register D. free running multivibrator

Last Answer : Answer: C

Find the time constant for a R-C circuit for resistance R = 24 kohm and C = 16 microfarad. a) 1.5 millisecond b) 0.6 nanosecond c) 384 millisecond d) 384 microsecond

Description : Find the time constant for a R-C circuit for resistance R = 24 kohm and C = 16 microfarad. a) 1.5 millisecond b) 0.6 nanosecond c) 384 millisecond d) 384 microsecond

Last Answer : c) 384 millisecond

Air blast circuit breakers for 400 kV power system are designed to operate in (a) 100 microsecond (b) 50 millisecond (c) 0.5 sec (d) 0.1 sec

Description : Air blast circuit breakers for 400 kV power system are designed to operate in (a) 100 microsecond (b) 50 millisecond (c) 0.5 sec (d) 0.1 sec

Last Answer : (b) 50 millisecond

What is 1 microsecond ?

Description : What is 1 microsecond ?

Last Answer : One fraction of 1 million parts of 1 second.

What is faster 1 microsecond or 10 microseconds?

Description : What is faster 1 microsecond or 10 microseconds?

Last Answer : Those are really measures of time, not of "fastness" orspeed.But if something takes less time, you can say that it occursfaster - in this case, 1 microsecond is less time, and thereforefaster.

What is faster 1 microsecond or 10 microseconds?

Description : What is faster 1 microsecond or 10 microseconds?

Last Answer : Those are really measures of time, not of "fastness" orspeed.But if something takes less time, you can say that it occursfaster - in this case, 1 microsecond is less time, and thereforefaster.

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

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 

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 

What are the different turn on methods of SCR?

Description : What are the different turn on methods of SCR?

Last Answer : Forward voltage triggering Gate Triggering dv/dt triggering Temperature triggering Light triggering

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

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

To turn a conducting SCR to off state, it is necessary to make : -

Description :  To turn a conducting SCR to off state, it is necessary to make : -  a) anode current less than holding current b)gate current zero  c) anode voltage less than break over voltage  d) gate voltage zero

Last Answer :  To turn a conducting SCR to off state, it is necessary to make : - anode current less than holding current

Signal normally used to study non-ideal flow by stimulus response technique is __________ input. (A) Pulse (B) Step (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Signal normally used to study non-ideal flow by stimulus response technique is __________ input. (A) Pulse (B) Step (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

What is the difference between SCR and thyristor?

Description : What is the difference between SCR and thyristor?

Last Answer : SCR is a type of thyristor. Like GTO, IGCT, MCT, TRIAC, DIAC etc. are the types of thyristor.

The function of Snubber circuit connected across the SCR is to

Description : The function of Snubber circuit connected across the SCR is to (A) Suppress dv/dt (B) Increase dv/dt (C) Decrease dv/dt (D) Decrease di/dt

Last Answer : The function of snubber circuit across a SCR is to Reduce dv/dt 

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

Description : Once SCR starts conducting a forward current, its gate losses control over (A) Anode circuit voltage only (B) Anode circuit current only (C) Anode circuit voltage and current (D) None of the above

Last Answer : Anode circuit voltage and current 

SCR can act as _______ controlled rectifier.

Description : SCR can act as _______ controlled rectifier. A. phase B. frequency C. amplitude D. power  

Last Answer : SCR can act as phase controlled rectifier.

For an SCR, di/dt protection is achieved through the use of

Last Answer : For an SCR, di/dt protection is achieved through the use of L in series with SCR.

For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary

Description : For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively   (A) ferrite : 20 : 1 (B) laminated iron : 1 :1 (C) ferrite : 1 : 1 (D) powered iron : 1: 1

Last Answer : For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively ferrite : 1 : 1

Draw and explain the working of Schmitt trigger.

Description : Draw and explain the working of Schmitt trigger.

Last Answer : A Schmitt trigger converts an irregular shaped waveform into a square wave. It is a special type of comparator in which the output changes from one saturation level to another saturation level depending on ... the output is driven to + VSAT. the circuit diagram and waveforms are as shown.

When sine wave is given as input to Schmitt trigger then it generates :

Description : When sine wave is given as input to Schmitt trigger then it generates : (A) Sine wave (B) Saw tooth wave (C) Triangle wave (D) Square wave

Last Answer : When sine wave is given as input to Schmitt trigger than it generates Square Wave

How do you convert Flash files to .SCR files on a Mac?

Description : How do you convert Flash files to .SCR files on a Mac?

Last Answer : answer:I don't know it it's even possible to do it. And I don't think there's any software that would meet your specifications; Mac software to convert Flash to .scr. .SCR files are ... 's a pretty good program for Windows called InstantStorm that's free and would do the conversion pretty easily.

Are there any other keyboard shortcuts to take screen shots other than Prt Scr.

Description : Are there any other keyboard shortcuts to take screen shots other than Prt Scr.

Last Answer : You can always download a screenshot utility. Most of those are either click-based or have assignable key commands.

What is an analogy for fly using spr str scr and thr?

Description : What is an analogy for fly using spr str scr and thr?

Last Answer : What is the answer ?

A silicon controlled rectifier (SCR) is a solid state device used to change ________________. A. DC to AC and control relatively low load current B. AC to DC and control relatively high load current C. DC to AC and control relatively high load current D. AC to DC and control relatively low load current

Description : A silicon controlled rectifier (SCR) is a solid state device used to change ________________. A. DC to AC and control relatively low load current B. AC to DC and control relatively high load ... to AC and control relatively high load current D. AC to DC and control relatively low load current

Last Answer : Answer: B

What are the different operation regions of the SCR?

Description : What are the different operation regions of the SCR?

Last Answer : SCR or thyristor will have three regions of operations based on the mode in which the device is connected in the circuit. Reverse blocking region: When the cathode of the thyristor is made positive with ... scr. Hence a gate signal is applied before the forward break over voltage to trigger the scr.

What are the advantages of GTO over SCR?

Description : What are the advantages of GTO over SCR?

Last Answer : a. Elimination of commutation of commutating components in forced commutation, resulting in reduction in cost, weight and volume. b. Reduction in acoustic noise and electromagnetic noise due to ... turn-off, permitting high switching frequencies. d. Improved efficiency of the converters.

What is latching current in SCR?

Description : What is latching current in SCR?

Last Answer : It is the minimum current required to latch(turn on) the SCR from forward blocking state to forward conduction state.

What is holding current in SCR?

Description : What is holding current in SCR?

Last Answer : When scr is conducting current in forward conduction state, scr will return to forward blocking state when the anode current or forward current falls below a low level called Holding current Note: ... the turn off process. In general holding current will be slightly lesser than the latching current.

What you mean by SCR?

Description : What you mean by SCR?  

Last Answer : SCR is meant for silicon controlled rectifier.  

what is the main application of scr in electronic field as well as in software field?

Description : what is the main application of scr in electronic field as well as in software field?

Last Answer : Ans- SCR is a rectifier we use this in power handling applications . By varying on time and off time of the scr i.e by giving the pulse to its gate we can vary the average output power ... part we can use micro controller and write a programme so that to generate required pulses to control the SCR.

Which is the most suitable power device for high frequency ( more 100 kHz) switching application? a) Power MOSFET b) BJT c) SCR d) UJT

Description : Which is the most suitable power device for high frequency ( more 100 kHz) switching application? a) Power MOSFET b) BJT c) SCR d) UJT

Last Answer : Ans: Power MOSFET

A modern power semiconductor device IGBT is combines the characteristics of a) BJT and MOSFET b) FCT and GTO c) SCR and MOSFET d) SCR and BJT

Description : A modern power semiconductor device IGBT is combines the characteristics of a) BJT and MOSFET b) FCT and GTO c) SCR and MOSFET d) SCR and BJT

Last Answer : Ans: BJT and MOSFET

What is the only way to cause an SCR to stop conducting?

Description : What is the only way to cause an SCR to stop conducting?

Last Answer : The forward bias must be reduced below the minimum conduction level.

When an SCR is forward biased, what is needed to cause it to conduct?

Description : When an SCR is forward biased, what is needed to cause it to conduct?

Last Answer : A gate signal.

The SCR is primarily used for what function?

Description : The SCR is primarily used for what function?

Last Answer : The SCR is primarily used for switching power on or off.

When testing an SCR with an ohmmeter, the SCR will conduct if what two elements are shorted together?

Description : When testing an SCR with an ohmmeter, the SCR will conduct if what two elements are shorted together?

Last Answer : Gate and anode.

What is a thyristor? What is an SCR?

Description : What is a thyristor? What is an SCR?

Last Answer : A thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act as bi stable switches, conducting when their gate receives a current trigger, and continue ... ) is a four-layer solid state device that controls current. It is a type of thyristor.

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%.

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.