6. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is—

1. 1. 1

   
   
   

   2. 2

   
   
   

   3. 3

   
   
   

   4. 4

   
   
   

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   NA

   Correct Option: B

   NA

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7. In a thyristor, anode current is made up of—

1. 1. electrons only

   
   
   

   2. electrons or holes

   
   
   

   3. electrons and holes

   
   
   

   4. holes only

   
   
   

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   NA

   Correct Option: C

   NA

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8. When a thyristor gets turned on, the gate drive—

1. 1. should not be removed as it will turn-off the SCR

   
   
   

   2. may or may not be removed

   
   
   

   3. should be removed

   
   
   

   4. should be removed in order to avoid increased losses and higher junction temperature
      

   
   
   

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   NA

   Correct Option: D

   NA

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9. The forward voltage drop during SCR on-state is 1·5 V. This voltage drop—

1. 1. remains constant and is independent of load current

   
   
   

   2. increases slightly with load current

   
   
   

   3. decreases slightly with load current

   
   
   

   4. varies linearly with load current
      

   
   
   

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   NA

   Correct Option: B

   NA

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10. For normal SCRs, turn-on time is—

1. 1. less than turn-off time t_q

   
   
   

   2. more than t_q

   
   
   

   3. equal to t_q

   
   
   

   4. half of t_q
      

   
   
   

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   NA

   Correct Option: A

   NA

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