How do you test an SCR?

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asked Mar 15, 2018 by anonymous

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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 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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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.

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asked Apr 28, 2018 by anonymous

If a 5-bus test system contains 6 transmission lines and one transformer, how many non- zero elements are

If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19

Last answer: If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.

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2.9k views 1 answer

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

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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

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asked Apr 29, 2018 by anonymous

Slip test is performed to determine : (A) Slip in an induction motor vtkgi Xd and Xq in a salient pole alternator

Slip test is performed to determine : (A) Slip in an induction motor (B) Xd and Xq in a salient pole alternator (C) Synchronous impedance in an alternator (D) Positive and negative sequence impedances of an alternator

Last answer: Slip test is performed to determine : Xd and Xq in a salient pole alternator

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78 views 1 answer

asked Mar 19, 2018 by anonymous

An open-circuit test on a transformer is conducted primarily to measure?

Last answer: The open-circuit test in a transformer is used to measure

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asked Mar 10, 2018 by anonymous

What is an insulation resistance test?

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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%.

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5 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.

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66 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.

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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.

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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.

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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.

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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.

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77 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:

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266 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.

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381 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

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213 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

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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

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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

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122 views 1 answer

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

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111 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

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asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

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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.

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asked Mar 6, 2018 by anonymous

Is SCR unidirectional switch?

Last answer: Yes, SCR is a unidirectional switch.

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56 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.

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516 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.

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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.

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75 views 1 answer

asked Apr 30, 2020 by anonymous

Polarity Test of Transformer

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asked Apr 27, 2020 by anonymous

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

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asked Apr 27, 2020 by anonymous

With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.

Last answer: i) This test is carried out on 3-ph transformer to identify primary & secondary winding belonging to the same phase. ii) As shown in fig above all primary & secondary phases ... of this test is to check the respective phases of primary & secondary windings in 3-ph transformer

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asked Apr 27, 2020 by anonymous

Explain the open delta (delta-delta) test on transformer.

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asked Apr 22, 2020 by anonymous

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asked Apr 21, 2020 by anonymous

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asked Apr 16, 2020 by anonymous

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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asked Jul 27, 2019 by anonymous

Why phasing out and polarity test is carried out on three phase transformer?

Last answer: The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.

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asked Jul 22, 2019 by anonymous

What is test bench? Write its applications

Last answer: Test Bench: A test bench is used to verify the functionality of the design. We need to stimulate our designs in order to test their functionality. Stimulus in a real system is from an ... the entity under test and to collect output responses. 6. To compare output responses with expected values.

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54 views 1 answer

asked Mar 21, 2018 by anonymous

Murray loop test can be used for location of?

Last answer: Murray loop test can be used for location of both the ground fault and the short-circuit fault.

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58 views 1 answer

asked Mar 20, 2018 by anonymous

Hopkinson's test on D.C. machines is conducted at?

Last answer: Hopkinson's test on D.C. machines is conducted at full-load.

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78 views 1 answer

asked Mar 20, 2018 by anonymous

The duration of sudden short-circuit test on a synchronous motor is usually about?

Last answer: The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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asked Mar 19, 2018 by anonymous

During open circuit test of a transformer?

Last answer: During open circuit test of a transformer primary is supplied rated voltage.

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asked Mar 19, 2018 by anonymous

Short circuit test on transformers is conducted to determine?

Last answer: Short circuit test on transformers is conducted to determine copper losses.

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106 views 1 answer

asked Mar 19, 2018 by anonymous

A no-load test is performed on a transformer to determine?

Last answer: A no-load test is performed on a transformer to determine magnetizing current and loss.

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84 views 1 answer

asked Mar 19, 2018 by anonymous

Sumpner's test is conducted on transformer to determine?

Last answer: Sumpner's test is conducted on transformer to determine temprature.

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92 views 1 answer

asked Mar 10, 2018 by anonymous

Why high voltage test is done?

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asked Mar 10, 2018 by anonymous

What is a high voltage test?

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How do you test an SCR?

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