ECT211 Power Devices and Application Quiz
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Questions and Answers

What is the meaning of the name 'Thyristor'?

  • A device with the ability to change its state from ON to OFF
  • An acronym for 'The Yearly Rectifier and Semiconductor Transistor'
  • A combination of the capital letters from THYRatron and transISTOR (correct)
  • A type of semiconductor device with four layers and three junctions

    • How did the International Electrotechnical Commission (IEC) define a thyristor in 1963?

  • It is a device with the ability to control current in one direction
  • It is a type of semiconductor switching device with four layers and three junctions
  • It constitutes three or more p-n junctions and has two stable states (correct)
  • It is a type of silicon-controlled rectifier (SCR)

    • Which is the oldest and first member of the thyristor family?

  • Transistor
  • Thyratron
  • International Electrotechnical Commission (IEC)
  • Silicon Controlled Rectifier (SCR) (correct)

    • What is the main reason behind naming the SCR as 'SCR'?

    <p>Silicon is used for its construction and it operates as a rectifier that can be controlled</p> Signup and view all the answers

    What are the two stable states of a thyristor according to the IEC definition?

    <p>ON-state and OFF-state</p> Signup and view all the answers

    What is the significance of the term commutation in relation to thyristors?

    <p>It refers to the process of turning off the thyristor</p> Signup and view all the answers

    In the forward conduction mode, what happens to the reverse biased junction J2?

    <p>It undergoes avalanche breakdown at the forward breakover voltage VBO</p> Signup and view all the answers

    What is the latching current (IL) of a thyristor defined as?

    <p>The minimum anode current required to maintain conduction when gate signal is removed</p> Signup and view all the answers

    Which of the following is the most commonly used thyristor?

    <p>Silicon Controlled Rectifier (SCR)</p> Signup and view all the answers

    What is the purpose of the gate pulse width in relation to the latching current (IL)?

    <p>To ensure that the anode current rises above the latching current (IL)</p> Signup and view all the answers

    What does the two-transistor analogy of an SCR involve?

    <p>Anode current calculation using two transistors</p> Signup and view all the answers

    What does an SCR act like when turned ON?

    <p>A low resistance current flow path from anode to cathode</p> Signup and view all the answers

    In which mode is the thyristor said to be forward biased?

    <p>Forward blocking mode</p> Signup and view all the answers

    What happens to junction J1 and J2 when the thyristor is turned ON and conducting?

    <p>J1 and J2 are forward biased and J3 is reverse biased</p> Signup and view all the answers

    What material was chosen for SCR due to its high temperature and power capabilities?

    <p>(SCR) Silicon</p> Signup and view all the answers

    What happens to junction J2 in the forward conduction mode?

    <p>It undergoes avalanche breakdown at a voltage called forward breakover voltage VBO</p> Signup and view all the answers

    What is the meaning of the term 'Thyristor', as derived from its name?

    <p>It signifies a combination of the capital letters from THYRatron and transISTOR</p> Signup and view all the answers

    How did the International Electrotechnical Commission (IEC) define a thyristor in 1963?

    <p>It has three or more p-n junctions and two stable states</p> Signup and view all the answers

    What is the main reason behind naming the Silicon Controlled Rectifier (SCR) as 'SCR'?

    <p>As it operates as a rectifier with controlled conduction and resistance</p> Signup and view all the answers

    What does the two-transistor analogy of an SCR involve?

    <p>It includes comparing an SCR to a combination of two individually operating transistors</p> Signup and view all the answers

    Which material was chosen for SCR due to its high temperature and power capabilities?

    <p>Silicon</p> Signup and view all the answers

    What happens to junction J1 and J2 when the thyristor is turned ON and conducting?

    <p>J1 becomes forward-biased, and J2 becomes reverse-biased</p> Signup and view all the answers

    What is the anode current of the device in the two-transistor analogy of an SCR with a gain of PNP transistor = 0.4, gain of NPN transistor = 0.5, and gate current = 50 mA?

    <p>25 mA</p> Signup and view all the answers

    In the forward conduction mode, what happens to the reverse biased junction J2?

    <p>It has an avalanche breakdown at a voltage called forward breakover voltage VBO</p> Signup and view all the answers

    What happens to junction J1 and J2 when the thyristor is turned ON and conducting?

    <p>J1 and J3 are forward biased and J2 is reverse biased</p> Signup and view all the answers

    Which of the following is the most commonly used thyristor?

    <p>Silicon Controlled Rectifier (SCR)</p> Signup and view all the answers

    What is the purpose of the gate pulse width in relation to the latching current (IL)?

    <p>To ensure that the anode current rises above the latching current (IL)</p> Signup and view all the answers

    What is the meaning of the name 'Thyristor'?

    <p>'Four layers'</p> Signup and view all the answers

    What are the two stable states of a thyristor according to the IEC definition?

    <p>'Conduction' and 'Blocking'</p> Signup and view all the answers

    'Silicon was chosen because of its high temperature and power capabilities.' What material was chosen for SCR due to its high temperature and power capabilities?

    <p>'Silicon'</p> Signup and view all the answers

    'When turned ON: there is a low resistance current flow path from anode to cathode, it acts like a ___.' What does an SCR act like when turned ON?

    <p>'Resistor'</p> Signup and view all the answers

    'When anode to cathode forward voltage is increased with gate circuit open, reverse biased junction J2 will have an avalanche breakdown at a voltage called forward breakover voltage VBO.' What happens to junction J2 in this scenario?

    <p>It has an avalanche breakdown at a voltage called forward breakover voltage VBO</p> Signup and view all the answers

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