161. At present, the state of the art devices are available as under— MOSFET BJT
     

1. 1. 1200 V, 800 A 500 V, 140 A
      

   
   
   

   2. 500V, 140 A 1200 V, 800 A
      

   
   
   

   3. 800 V, 1000 A 1000 V, 1200 A
      

   
   
   

   4. 200 V, 140 A 1500 V, 800 A

   
   
   

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   NA

   Correct Option: B

   NA

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162. When a thyristor is negatively biased—
     

1. 1. All the three functions are negatively biased
      Quter functions are positively biased and the inner function are negatively biased
      

   
   
   

   2. Quter functions are negatively biased and the inner function are positively biased
      

   
   
   

   3. The function near the Anode is negatively biased and

   
   
   

   4. the one near the cathode is positively biased

   
   
   

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   NA

   Correct Option: C

   NA

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163. Secondary breakdown occurs in—
     

1. 1. MOSFET but not in BJT
      

   
   
   

   2. Both BJT and MOSFET
      

   
   
   

   3. BJT but not in MOSFET
      

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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164. Choose the correct statement—
     

1. 1. Both MOSFET and BJT are Voltage Controlled Devices (CDs)
      

   
   
   

   2. Both MOSFET and BJT are current CDs.
      

   
   
   

   3. MOSFET is a voltage CDs whereas BJT is a current CDs.
      

   
   
   

   4. MOSFET is a current CDs whereas BJT is a voltage CDs.

   
   
   

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   NA

   Correct Option: C

   NA

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165. A Chopper operating at a fixed frequency is feeding an R–L load. As the duty ratio of the chopper is increased from 25% to 75%, the ripple in the load current—
     

1. 1. Remain constant
      

   
   
   

   2. Decreases, reaches a minimum at 50% duty ratio and then increases
      

   
   
   

   3. Increases, reaches a maximum at 50%, duty ratio and then decreases
      

   
   
   

   4. Keeps on increasing as the duty ratio is increased

   
   
   

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   NA

   Correct Option: A

   NA

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