31. The average on-state current an SCR is 20 A for a resistive load. If an inductance of 5 mH is included in the load, then average on-state current would be—
    

1. 1. more than 20 A

   
   
   

   2. less than 20 A

   
   
   

   3. 15 A

   
   
   

   4. 20 A

   
   
   

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   NA

   Correct Option: A

   NA

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32. Specification sheet for an SCR gives its maximum rms on-state current as 35 A. This rms rating for a conduction angle of 120° would be—
    

1. 1. more than 35 A

   
   
   

   2. less than 35 A

   
   
   

   3. 35 A

   
   
   

   4. 52·5 A

   
   
   

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   NA

   Correct Option: C

   NA

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33. For an SCR, di/dt protection is achieved through the use of—
    
    

1. 1. R in series with SCR

   
   
   

   2. RL in series with SCR

   
   
   

   3. L in series with SCR

   
   
   

   4. L across SCR

   
   
   

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   NA

   Correct Option: B

   NA

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34. The object of connecting resistance and capacitance across gate circuit is to protect the SCR gate against—
    
    

1. 1. over-voltages

   
   
   

   2. dv/dt

   
   
   

   3. noise signals

   
   
   

   4. over-currents

   
   
   

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   NA

   Correct Option: C

   NA

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35. The function of snubber circuit connected across an SCR is to—

1. 1. suppress dv/dt (b)

   
   
   

   2. increase dv/dt

   
   
   

   3. decrease dv/dt (d)

   
   
   

   4. keep transient overvoltage at a constant value
      

   
   
   

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   NA

   Correct Option: A

   NA

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