• ( 2 ) Present day HVDC converters are all

    • 1) 3 pulse converters
    • 2) 6 pulse converters
    • 3) 12 pulse converters
    • 4) either 6 pulse or 12 converters
    • Discussion in forum
      Answer : 3) 12 pulse converters
      Solution : Present day HVDC converters are all 12 pulse converters








      discussion


      Answer : 3) 12 pulse converters

    • ( 3 ) In dielectric heating, the thyristor circuits consist of

    • 1) rectifier-chopper combination
    • 2) controlled rectifier
    • 3) ac regulator
    • 4) rectifier-inverter combination
    • Discussion in forum
      Answer : 4) rectifier-inverter combination
      Solution : In dielectric heating, the thyristor circuits consist of rectifier-inverter combination








      discussion


      Answer : 4) rectifier-inverter combination

    • ( 4 ) In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts for

    • 1) p radians
    • 2) (p - a) radians
    • 3) (p + a) radians
    • 4) (p - 0.5 a) radians
    • Discussion in forum
      Answer : 2) (p - a) radians
      Solution : In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts for (p - a) radians








      discussion


      Answer : 2) (p - a) radians

    • ( 5 ) In controlled heating circuits, thyristors act as

    • 1) rectifier
    • 2) inverter
    • 3) ac regulato
    • 4) chopper
    • Discussion in forum
      Answer : 3) ac regulato
      Solution : In controlled heating circuits, thyristors act as ac regulato








      discussion


      Answer : 3) ac regulato

    • ( 6 ) A relaxation oscillator uses

    • 1) tunnel diode
    • 2) UJT
    • 3) both tunnel diode and UJT
    • 4) PIN diode
    • Discussion in forum
      Answer : 2) UJT
      Solution : A relaxation oscillator uses UJT








      discussion


      Answer : 2) UJT

    • ( 7 ) A single phase full converter can operate in

    • 1) 4 quadrants
    • 2) 3 quadrants
    • 3) 2 quadrants
    • 4) 1 quadrant
    • Discussion in forum
      Answer : 3) 2 quadrants
      Solution : A single phase full converter can operate in 2 quadrants








      discussion


      Answer : 3) 2 quadrants

    • ( 8 ) The gate lead, in a thyristor is welded to :

    • 1) p layer to which anode is connected
    • 2) n layer nearest to the anode terminal
    • 3) p layer nearest to the cathode terminal
    • 4) outside n layer
    • Discussion in forum
      Answer : 2) n layer nearest to the anode terminal
      Solution : The gate lead, in a thyristor is welded to n layer nearest to the anode terminal








      discussion


      Answer : 2) n layer nearest to the anode terminal

    • ( 9 ) The characteristics of which device has peak point and valley point

    • 1) SCR
    • 2) PUT
    • 3) SCS
    • 4) Shockley diode
    • Discussion in forum
      Answer : 2) PUT
      Solution : PUT








      discussion


      Answer : 2) PUT

    • ( 10 ) Thyristors connected in series need :

    • 1) static equalizing circuit
    • 2) dynamic equalizing circuit
    • 3) both static and dynamic equalizing circuits
    • 4) None of these
    • Discussion in forum
      Answer : 3) both static and dynamic equalizing circuits
      Solution : Thyristors connected in series need static and dynamic equalizing circuits








      discussion


      Answer : 3) both static and dynamic equalizing circuits





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