11. The number of p-n junctions in a thyristor is—

1. 1. 1

   
   
   

   2. 2

   
   
   

   3. 3

   
   
   

   4. 4

   
   
   

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   NA

   Correct Option: C

   NA

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12. In the circuit of given Fig. the diode states at the extremely large negative value of the input voltage v_i are—
    
    
    

1. 1. D1 off, D2 off

   
   
   

   2. D1 on, D2 off

   
   
   

   3. D1 off, D2 on

   
   
   

   4. D1 on, D2 on

   
   
   

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   NA

   Correct Option: B

   NA

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13. Fig. shows an electronic voltage regulator. The zener diode may be assumed to require a minimum current of 25 mA for satisfactory operation. The value of R required for satisfactory operation is…… ohm.
    
    
    

1. 1. 80

   
   
   

   2. 40

   
   
   

   3. 20

   
   
   

   4. None of these
      

   
   
   

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   NA

   Correct Option: A

   NA

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14. In Fig. PIV required for the diode is—
    
    
    

1. 1. 300 V

   
   
   

   2. 100 V

   
   
   

   3. 200 V

   
   
   

   4. 400 V

   
   
   

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   NA

   Correct Option: D

   NA

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15. A single phase full bridge diode rectifier delivers a load current of 10 A, which is ripple free. Average and rms values of diode currents are respectively—

1. 1. 10 A, 7·07 A

   
   
   

   2. 5 A, 10 A

   
   
   

   3. 5 A, 7·07 A

   
   
   

   4. 7·07 A, 5 A

   
   
   

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   NA

   Correct Option: A

   NA

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