31. For a pulse transformer the material used for its care and the possible turn off ratio from primary to secondary are respectively—
    

1. 1. Powdered iron: 1: 1
      

   
   
   

   2. Laminated iron: 1: 1
      

   
   
   

   3. Ferrite: 1: 1
      

   
   
   

   4. Ferrite: 20: 1

   
   
   

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   NA

   Correct Option: C

   NA

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32. Consider the following statements about SCR—
    1. For Normal SCR, Turn-on time is more than turn off time
    2. A forward voltage can be applied to an SCR after its gate recovery time
    3. Static V–I characteristics of an SCR with different Gate drives applied to the Gate are indicated by
    V_g2 > V_g1 > V_g0
    

1. 1. 1 only
      

   
   
   

   2. 2 only
      

   
   
   

   3. 2 and 3 only
      

   
   
   

   4. 1 and 2 only

   
   
   

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   NA

   Correct Option: C

   NA

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33. Silicon greases are often applied on heat sinks to—
    

1. 1. Reduce radiation Loss
      

   
   
   

   2. Improve convertive heat loss
      

   
   
   

   3. Minimize the formation of oxides and corrosion
      

   
   
   

   4. To connect non-metallic parts with metallic parts

   
   
   

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   NA

   Correct Option: D

   NA

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34. Series connected power transistor should be—
    

1. 1. turned on or off simultaneously
      

   
   
   

   2. turned on with slowest device initially
      

   
   
   

   3. turned off with fast device initially
      

   
   
   

   4. turned off or on in order of increasing transconductance

   
   
   

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   NA

   Correct Option: A

   NA

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35. Which of the following regulator can provide o/p voltage more than or less than the I/P voltage?
    1. Buck regulator
    2. Boost regulator
    3. Buck-boost Regulator
    4. Cuk regulator
    

1. 1. 1 and 2 only
      

   
   
   

   2. 2 and 3 only
      

   
   
   

   3. 3 and 4 only
      

   
   
   

   4. 1, 2 and 3 only

   
   
   

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   NA

   Correct Option: C

   NA

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