86. Depletion layer width.......under.......condition and....... under .......condition.

1. 1. Decreases, forward biased, increases, reverse biased

   
   
   

   2. Increases, forward biased, decreases reverse biased

   
   
   

   3. Decreases, reverse biased, increases, forward biased

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Depletion layer width decreases under forward biased condition and increases under reverse biased condition.

   Correct Option: A

   Depletion layer width decreases under forward biased condition and increases under reverse biased condition.

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87. Reverse saturation of silicon diode at 25ºC is 20 nA. The reverse saturation current at 60C will be—

1. 1. 20 × 4.5 nA

   
   
   

   2. 20 × e^4.5 nA

   
   
   

   3. 20 × 2^–4.5 nA

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   I’ = I 02		Tf - Ti
   		10

   
   

   = 20 nA × 2		60° – 25°
   		10

   
   = 20 × 28.5 nA
   Where,
   I₀ = Leakage current
   I_f = Final temperature
   I_i = Initial temperature

   Correct Option: D

   I’ = I 02		Tf - Ti
   		10

   
   

   = 20 nA × 2		60° – 25°
   		10

   
   = 20 × 28.5 nA
   Where,
   I₀ = Leakage current
   I_f = Final temperature
   I_i = Initial temperature

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88. When a diode is heavily doped—
    (A) The zener voltage will be low
    (B) The avalanche voltage will be high
    (C) The depletion region will be thin
    (D) The leakage current will be low

1. 1. Is due to majority carriers

   
   
   

   2. Decreases with decreasing temperature

   
   
   

   3. Is in mA or µA range

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   When a diode is heavily doped the depletion region will be thin.

   Correct Option: C

   When a diode is heavily doped the depletion region will be thin.

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89. Leakage current of a junction diode—

1. 1. Is due to majority carriers

   
   
   

   2. Decreases with decreasing temperature

   
   
   

   3. Is in mA or µA range

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Leakage current of a junction diode decreases with decreasing temperature.

   Correct Option: B

   Leakage current of a junction diode decreases with decreasing temperature.

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90. When reverse bias is applied to a junction diode, it—

1. 1. Increases the potential barrier

   
   
   

   2. Decreases the potential barrier

   
   
   

   3. Greatly increases the minority carrier current

   
   
   

   4. Greatly increases the majority carrier current

   
   
   

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1. View Hint View Answer Discuss in Forum

   When reverse bias is applied to a junction diode it increases the potential barrier.

   Correct Option: A

   When reverse bias is applied to a junction diode it increases the potential barrier.

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