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Higher Study | Power Electronics and Drives | Phase Controlled Rectifiers

A 3-phase semi-converter works as a six-pulse converter when the firing angle α is:
In a 3-phase converter circuit, during commutation when one SCR in one phase is turned on, turning of an SCR in another phase results is:
When we compare the half bridge converter and full bridge converter 1. The maximum collector current of a full bridge is only double that of the half bridge 2. Full bridge uses 4-power switches instead of 2, as in the double bridge. 3. Output power of a full bridge is twice that of a half bridge with the same input voltage and current. When of the above statements are correct?
In the circuit shown in the given figure, the SCR is fired at 45°. Which of the following statements is correct with respect to load voltage and current at ωt = π?
Figure shows 1-ϕ full converter feeding RLE load with XL = 3 Ω, R = 4 Ω, and E = 10 V. Determine the average value of load voltage for the average load current of ILo = 50 A.
An SCR HWR is applied a Sine wave voltage. If its firing angle is 45°, what is the value of the maximum conduction angle possible if load is purely resistive in nature? Identify from the options given below. 
Which of the following devices converts AC power into DC power?
Which of the following is NOT one of the rectifier types?
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: Phase controlled converters at small values of output voltage have 1. Large harmonics in utility system 2. Poor power factor 3. High efficiency 4. Notches in line voltage waveform Which of the above statements are correct?
Which one of the following devices is not a switched-mode DC power supply?
In dual converter, the circulating current A) Allows smooth reversal of load current B) Improves speed of response Which of the options is true?
Consider the following statements: 1. The voltage developed across the OFF switches of the half-bridge converter is the maximum dc-link voltage. 2. In the full-bridge converter, the voltage across the primary of the transformer is the dc link voltage. 3. The voltage developed across the OFF switches of the full-bridge converter is half the maximum dc-link voltage. Which of the above statements are correct?
A half controlled single-phase bridge converter is supplying an R-L load. The triggering angle is α. If the load current is continuous, the duration for which the freewheeling of the load takes place in a half cycle of the input voltage is
When thyristors are used in series or parallel a snubber circuit is used to
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