Bissoy.com
Doctors Medicines MCQs Q&A

Related Questions

Which of the following is false for a Thyristor? A. Thyristor is a majority carrier device B. The forward-bias portion of Thyristor’s i-v characteristics has two stable operating regions. C. The forward-bias portion of Thyristor’s i-v characteristics has one stable operating region. D. The negative gate current turns off the thyristor.
A DC supply of 100 V feeds an inductance of 10 H through a thyristor. What is the minimum width of the gate pulse so that the thyristor is triggered, if the latching current of thyristor is 80 mA ? 
In a McMurray inverter, diodes are connected in inverse parallel to thyristors to 1. Protect the thyristor 2. Make the turn off of the thyristor successful 3. Make the turn on of the thyristor successful 4. Provide path to the reactive component of the load current Which of the above statements are correct?
When thyristors are used in series or parallel a snubber circuit is used to
What are the main components used in a snubber circuit?
Snubber circuit is not used in FACTS.
Determine the loss in the snubber circuit, if C = 0.545 μF and supply is 200 V, 10 kHz.
The expression for the thyristor (chopper switch) current is given by I = (α2.Vs – αE)/R Find the value of firing angle α, for which the thyristor current is maximum.
Generally ________ is regarded as to contain the shunt-connected, thyristor-controlled reactors or thyristor-switched capacitors or their combinations.
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 :