36. Gate characteristic of a thyristor—

1. 1. is a straight line passing through origin
      

   
   
   

   2. is of the type V_g = a + b I_g

   
   
   

   3. is a curve between V_g and I_g

   
   
   

   4. has a spread between two curves of V_g – I_g.

   
   
   

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   NA

   Correct Option: D

   NA

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37. In an SCR, anode current flows over a narrow region near the gate during—
    

1. 1. delay time t_d
      
      

   
   
   

   2. rise time t_r and spread time t_p

   
   
   

   3. t_d and t_p

   
   
   

   4. t_d and t_r

   
   
   

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   NA

   Correct Option: D

   NA

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38. Turn-on time for an SCR is 10 μ sec. If an inductance is inserted in the anode circuit, then the turn-on time will be—

1. 1. 10 μ sec

   
   
   

   2. less than 10 μ sec

   
   
   

   3. more than 10 μ sec

   
   
   

   4. about 10 μ sec

   
   
   

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   NA

   Correct Option: C

   NA

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39. Once SCR starts conducting a forward current, its gate loses control over—
    

1. 1. anode circuit voltage only

   
   
   

   2. anode circuit current only

   
   
   

   3. anode circuit voltage and current

   
   
   

   4. anode circuit voltage, current and time

   
   
   

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   NA

   Correct Option: C

   NA

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40. The SCR ratings, di/dt in A/μsec and dv/dt in V/μsec, may vary, respectively, between—

1. 1. 20 to 500, 10 to 100

   
   
   

   2. both 20 to 500

   
   
   

   3. both 10 to 100

   
   
   

   4. 50 to 300, 20 to 500

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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