426. The diffusion length LP for hole in a semiconductor equals—

1. 1. DP τP

   
   
   

   2. (DP τP) ²

   
   
   

   3. √DPτP

   
   
   

   4. 	DP
      	τP

   
   
   

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   NA

   Correct Option: C

   NA

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427. When forward bias is applied to a junction diode, it—
     

1. 1. Increases the potential barrier

   
   
   

   2. Decreases the potential barrier

   
   
   

   3. Reduces the majority-current to zero

   
   
   

   4. Reduces the minority-carrier current to zero

   
   
   

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   NA

   Correct Option: B

   NA

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428. The reverse saturation current in a junction diode is the current that flows when—

1. 1. Only majority carriers are crossing the junction

   
   
   

   2. Only minority carriers are crossing the junction

   
   
   

   3. The junction is unbiased

   
   
   

   4. The potential barriers is zero

   
   
   

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   NA

   Correct Option: B

   NA

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429. The number of minority carriers crossing the junction of a diode depends primarily on the—

1. 1. Concentration of doping impurities

   
   
   

   2. Magnitude of the potential barrier

   
   
   

   3. Magnitude of the forward-bias voltage

   
   
   

   4. Rate of thermal generation of electron-hole pairs
      

   
   
   

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   NA

   Correct Option: D

   NA

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430. When we apply reverse bias to a junction diode, it—

1. 1. Lowers the potential barrier

   
   
   

   2. Raises the potential barrier

   
   
   

   3. Greatly increases the minority-carrier current

   
   
   

   4. Greatly increases the majority-carrier current
      

   
   
   

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   NA

   Correct Option: B

   NA

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