31. For a sinusoidal input voltage
    V_s = V_m sin ωt = √2 V_s sin ωt
    If the input voltage is connected to load for n cycles and is disconnected for m cycles, the rms output voltage is given by
    V₀ = V_s √K
    Where k is duty cycle which is given by:
    

1. 1. m + n
      

   
   
   

   2. m – n
      

   
   
   

   3. mn
      

   
   
   

   4. n/(m + n)

   
   
   

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   NA

   Correct Option: D

   NA

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32. MOS controlled thyristors have:
    1. Low forward voltage drop during conduction
    2. Fast turn-on and turn-off time
    3. Low switching losses
    4. High reverse voltage blocking capability
    5. Low gate input impedance
    Which are correct?
    

1. 1. 1, 2, 3
      

   
   
   

   2. 3, 4, 5
      

   
   
   

   3. 2, 3, 4
      

   
   
   

   4. 1, 3, 5

   
   
   

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   NA

   Correct Option: A

   NA

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33. Static induction thyristors have:
    

1. 1. High dv/dt and low di/dt
      

   
   
   

   2. Low dv/dt and high di/dt
      

   
   
   

   3. Low dv/dt and low di/dt
      

   
   
   

   4. High dv/dt and high di/dt

   
   
   

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   NA

   Correct Option: D

   NA

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34. In given fig., zero centre and ideal PMMC voltmeters M₁ and M₂ will read:
    
    
    
    

1. 1. – 10 V, 10 V
      

   
   
   

   2. 0, 10 V
      

   
   
   

   3. – 10 V, 7·07 V
      

   
   
   

   4. 10V, 7·07 V

   
   
   

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   NA

   Correct Option: A

   NA

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35. In given fig., capacitor C is initially charged with voltage V₀. Switch S is closed at t = 0. In steady state, V_C and V_D are respectively given by:
    
    
    
    

1. 1. V₀, – V₀
      

   
   
   

   2. 0, – V₀
      

   
   
   

   3. – V₀, 0
      

   
   
   

   4. V₀, V₀

   
   
   

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   NA

   Correct Option: A

   NA

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