Is SCR unidirectional switch?

Question

asked Mar 6, 2018 by anonymous

57 views

Please log in or register to answer this question.

1 Answer

← Prev Question Next Question →

Related questions

asked Mar 8, 2018 by anonymous

Explain three phase half wave controller or three phase unidirectional controller.

Last answer: Three phase half wave controller or unidirectional controller:

0 like 0 dislike

178 views 1 answer

asked Apr 28, 2018 by anonymous

The device which allows reverse power flow and withstands highest switch frequency is

The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR

Last answer: The device which allows reverse power flow and withstands highest switch frequency is MOSFET

0 like 0 dislike

60 views 1 answer

asked Mar 6, 2018 by anonymous

Is thyristor a DC switch?

Last answer: Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain

0 like 0 dislike

134 views 2 answers

asked Sep 15, 2017 by anonymous

why IGBT is preferred as a power switch over both power BJT and MOSFET?

Last answer: Because it has a higher switching frequency and heat tolerance.

1 like 0 dislike

110 views 1 answer

asked Feb 5, 2018 by anonymous

What are the desirable characteristics of ideal switch?

Last answer: Desirable characteristics of the ideal switch: It is desirable to have power switches characteristics closer to ideal switch. The ideal switch should have the following characteristics. Zero resistance when ... . 100% efficiency. Able to control power flow with zero power dissipation.

1 like 0 dislike

977 views 1 answer

asked 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.

0 like 0 dislike

496 views 1 answer

asked Apr 29, 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

0 like 0 dislike

62 views 1 answer

asked Apr 28, 2018 by anonymous

An SCR without any external connections is considered as

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

0 like 0 dislike

76 views 1 answer

asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

0 like 0 dislike

81 views 0 answers

asked Mar 19, 2018 by anonymous

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.

0 like 0 dislike

143 views 1 answer

asked Feb 3, 2018 by anonymous

What is holding current and latching current in SCR ?

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.

2 like 0 dislike

818 views 2 answers

asked Dec 9, 2017 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.

2 like 1 dislike

75 views 1 answer

asked May 21, 2020 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.

0 like 0 dislike

71 views 1 answer

asked 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.

0 like 0 dislike

221 views 1 answer

asked 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.

0 like 0 dislike

39 views 1 answer

asked Oct 13, 2019 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.

0 like 0 dislike

675 views 1 answer

asked 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.

0 like 0 dislike

132 views 1 answer

asked 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.

0 like 0 dislike

78 views 1 answer

asked Oct 13, 2019 by anonymous

Describe triggering of SCR using UJT relaxation oscillator.

Last answer: Triggering of SCR using UJT relaxation oscillator:

0 like 0 dislike

278 views 1 answer

asked Jul 25, 2019 by anonymous

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.

0 like 0 dislike

391 views 2 answers

asked 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

0 like 0 dislike

219 views 1 answer

asked Jun 18, 2018 by anonymous

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of

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

0 like 0 dislike

154 views 0 answers

asked Apr 28, 2018 by anonymous

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

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

0 like 0 dislike

114 views 1 answer

asked 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,

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

0 like 0 dislike

119 views 1 answer

asked Mar 6, 2018 by anonymous

SCR turned off when the anode current falls below?

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

0 like 0 dislike

525 views 1 answer

asked Sep 20, 2018 by anonymous

How rating of main switch and cable is selected for Industrial Installation.

Last answer: 1. Rating of Main Switch or Fuse Rating is decided in industrial installation: Rating of main switch or fuse is based up the starting current of motor. For calculating starting current is considered 2 ... take 1.5 times the rated current or full load current. & thus cable rating is decided.

0 like 0 dislike

114 views 1 answer

asked May 8, 2018 by anonymous

Earthing switch is used for?

Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above

Last answer: Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above

0 like 0 dislike

64 views 1 answer

asked Apr 28, 2018 by anonymous

A switch tail ring counter is made by using a single D-FF. The resulting circuit is

A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF

Last answer: A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF

0 like 0 dislike

69 views 1 answer

asked Mar 20, 2018 by anonymous

A centrifugal switch is used to disconnect starting winding when motor has?

Last answer: A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

0 like 0 dislike

200 views 1 answer

asked Dec 17, 2017 by anonymous

What is the difference between a switch and a relay?

Last answer: Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

0 like 0 dislike

90 views 1 answer

asked May 2, 2020 by anonymous

Draw & explain touch plate switch using IC555.

Last answer: It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .

0 like 0 dislike

51 views 1 answer

asked Apr 27, 2020 by anonymous

Give the function of fuse and switch.

Last answer: Functions of fuse: * To break the circuit under fault condition. * To provide overcurrent protection to the circuit. * To provide short circuit protection to the circuit. * To provide ... * To make the electric circuit manually. * To break the electric circuit manually.

0 like 0 dislike

49 views 1 answer

asked Jul 30, 2019 by anonymous

State the function of : i) MCCB ii) ELCB iii) MCB iv) Switch.

Last answer: i) MCB: Provide short circuit protection & over load protection to electrical loads. ii) ELCB: Provides protection by detecting the unsafe magnitudes leakage currents flowing to earth and disconnecting ... rating. iv) Switch: Make and break the electrical connection to the load manually.

0 like 0 dislike

2.6k views 3 answers

asked Jul 6, 2019 by anonymous

Transfer switch

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

0 like 0 dislike

41 views 1 answer

asked Mar 25, 2018 by anonymous

A closed switch has a resistance of?

Last answer: A closed switch has a resistance of zero.

0 like 0 dislike

126 views 1 answer

asked Mar 21, 2018 by anonymous

The switch board instruments?

Last answer: The switch board instruments should be mounted in vertical position.

0 like 0 dislike

66 views 1 answer

asked Mar 20, 2018 by anonymous

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then?

Last answer: If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

0 like 0 dislike

90 views 1 answer

asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last answer: Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

0 like 0 dislike

140 views 1 answer

asked Mar 20, 2018 by anonymous

In a single phase motor the centrifugal switch?

Last answer: In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

0 like 0 dislike

133 views 1 answer

asked Mar 19, 2018 by anonymous

A thermal protection switch can protect against?

Last answer: A thermal protection switch can protect against overload.

0 like 0 dislike

180 views 1 answer

asked Sep 27, 2017 by anonymous

in which region BJT act as a switch?

Last answer: BJT act as switch in saturation and cutoff region ( ON state in saturation region and OFF state in cut-off region )

0 like 0 dislike

91 views 2 answers

asked Jun 18, 2018 by anonymous

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

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

0 like 0 dislike

67 views 1 answer

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 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

0 like 0 dislike

129 views 1 answer

asked Jan 2 by anonymous

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%.

0 like 0 dislike

5 views 1 answer

asked Apr 28, 2018 by anonymous

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

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) inversely proportional to α and Φ (C) directly 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

0 like 0 dislike

122 views 1 answer

asked Mar 15, 2018 by anonymous

How do you test an SCR?

0 like 0 dislike

47 views 0 answers

asked Mar 11, 2018 by anonymous

Why is pulse train gating preferred over pulse gating ?

Why is pulse train gating preferred over pulse gating? Explain with relevant circuit and waveforms, the pulse train gating of SCRs.

0 like 0 dislike

2.6k views 0 answers

asked May 17, 2018 by anonymous

It is an unidirectional device that blocks the current flow from cathode to anode

It is an unidirectional device that blocks the current flow from cathode to anode (A) SCR (B) PCR (C) VCR (D) DCR

Last answer: It is an unidirectional device that blocks the current flow from cathode to anode SCR

0 like 0 dislike

50 views 1 answer

asked Mar 29, 2018 by anonymous

An SCR is a - - - switch

Last answer: An SCR is a Uni-directional switch

0 like 0 dislike

28 views 1 answer

asked May 23, 2018 by anonymous

TRIAC is an ac switch which can be made to conduct on

Last answer: TRIAC is an ac switch which can be made to conduct on both half cycle of AC voltage.

0 like 0 dislike

49 views 1 answer

anonymous · Answer 1 · 2018-03-06T10:01:04+0000

answered Mar 6, 2018 by anonymous

Yes, SCR is a unidirectional switch.

Is SCR unidirectional switch?

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

Please log in or register to add a comment.

Related questions