Recent questions tagged scr

0 answers 94 views

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 

asked Jun 18, 2018 in Power Electronics by Shimroz123
1 answer 16 views

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 

asked Jun 18, 2018 in Inductor by Shimroz123
1 answer 22 views

SCR is more utilized as compared to Triac because it is

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 57 views

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

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 24 views

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

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 38 views

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

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 21 views

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

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 33 views

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

asked Apr 28, 2018 in Electronics Engineering by Shimroz123
0 answers 24 views

Why SCR is called as thyristor?

asked Mar 19, 2018 in Thyristor by Quiz
1 answer 53 views

Is a SCR a thyristor?

asked Mar 19, 2018 in Thyristor by Quiz
0 answers 13 views

How do you test an SCR?

asked Mar 15, 2018 in Electronics Engineering by Quiz
0 answers 44 views

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

asked Mar 11, 2018 in Power Electronics by Quiz
1 answer 16 views
1 answer 306 views

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.

asked Feb 3, 2018 in Unit 1 by Shimroz
1 answer 41 views

What is the use of SCR?

asked Dec 9, 2017 in Power Electronics by Quiz
1 answer 106 views

What is the difference between a thyristor and an SCR?

asked Dec 9, 2017 in Power Electronics by Quiz
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