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For thyristors pulse triggering is preferred than dc triggering because:
In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :
Consider the following statements in connection with deflection-type and null-type instruments: 1. Null-type instruments are more accurate than the deflection-type ones. 2. Null-type of instrument can be highly sensitive compared to a deflection-type instrument. 3. Under dynamic conditions, null-type instruments are less preferred to deflection-type instruments. 4. Response is faster in null-type instruments as compared to deflection-type instruments. Which of the above statements are correct?
One positive pulse with tw = 75 µs is applied to one of the inputs of an exclusive-OR circuit. A second positive pulse with tw = 15 µs is applied to the other input beginning 20 µs after the leading edge of the first pulse. Which statement describes the output’s relation with the inputs?
The minimum duration of pulse in a pulse triggering system for thyristors should be at least
A dishonest shopkeeper purchased one kg pulse at 120 Rs/kg and sell at 150 Rs/kg. He is giving only 800 gm of pulse instead of 1 kg while selling. Which of the following is correct? I. Profit made by the shopkeeper is 56.25% II. Profit on 2 kg pulse is Rs. 100
Kha-kha is an obscure island which is inhabited by two types of people: the "Yes" type and the "No" type. A native of type 'yes' ask only questions and right answer to which is 'Yes' while those of type 'No' ask only questions the right answer to which is 'No'. For example, the 'yes' type will ask questions like "Is 2 plus 2 equal to 4?" While the "No" type will ask questions like "is 2 plus 2 equal to 5?". The following question is based on your visit to the island Kha-kha. Kevin and Kumar are brothers from the island. Kumar asks you. Is at least one of us is of type 'No'? You can conclude that
Which of the following circuit is used to obtain pulse gate triggering?
In an electric circuit, the reaction of a circuit to a given pulse input is known as the pulse response.
Consider the following grammar and the semantic actions to support the inherited type declaration attributes. Let X1, X2, X3, X4, X5 and X6 be the placeholders for the non-terminals D, T, L or L1 in the following table: Production rule Semantic action D → T L X1.type = X2.type T → int T.type = int T → float T.type = float L → L1, id X3.type = X4.type addType(id.entry, X5.type) L → id addType(id.entry, X6.type)   Which one of the following are the appropriate choices for X1, X2, X3 and X4?