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Consider the following statements: 1. In a silicon controlled rectifier (SCR), if the cathode gate is reverse-biased, then the SCR cannot fire at all. 2. The turn-on time of an SCR increases with temperature. 3. After an SCR is turned on, it can be made to turn off again by reverse biasing the gate. 4. Gate recovery time is the minimum time that the anode voltage must be maintained below holding voltage VH to turn off the SCR. Which of these statements are correct?
A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo
A 220 1-ϕ, 220 Ω  resistor is connected in series with the gate of an SCR as shown in the given figure. The gate current required to fire the SCR is 7 mA. what is the input voltage (Vin) required to fire the SCR?
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. In 2015, the Government of India launched a massive campaign named "Digital India". P. The main aim was to improve access to technology to the people of the country. Q. The government worked on improving internet connectivity. R. It also made sure that it was easily accessible to the remote and rural parts of the country.  S. This was started to make the government services accessible in various parts of the country. 6. One of the initiatives included a plan to connect the rural parts of the country with high-speed internet.
Given below is a sentence which has been divided into four parts. The first part, which has been marked bold, is fixed in the sequence. The other three parts have been rearranged in the sequence and the four options give possible sequences of the three parts. Choose the option which gives the correct sequence of the rearranged parts. The state has received scanty rainfall/ which has also been explained as the cause of (A)/ floods in other parts of the country (B)/ and many people attribute this to climate change (C)
In a motor of 120 machine parts, 5% parts were defective. In another motorof 80 machine parts, 10% parts were defective. For the two motors considered together,the percentage of defective machine parts were
Given below is a sentence which has been divided into four parts. The first part, which has been marked bold, is fixed in the sequence. The other three parts have been rearranged in the sequence and the four options give possible sequences of the three parts. Choose the option which gives the correct sequence of the rearranged parts. As much as I sympathize with you/ I can do much to help you because (A) / I'm afraid there's not much (B) / I'm in severe need of help myself. (C)
Consider the following statements: SCR can be turned on by 1. Applying anode voltage at a sufficiently fast rate 2. Applying sufficiently large anode voltage 3. decreasing the temperature of SCR 4. Applying sufficiently large gate current Which of the above statements are correct?
In which of the following commutation technique, the triggering of one SCR commutates the already conducting SCR and vice versa?
The forward current through the SCR below which the SCR turns off is called: