41. When transistors are used in series or parallel a snubber circuit is used to—
    

1. 1. Control the current
      

   
   
   

   2. Control the voltage
      

   
   
   

   3. Limit di/dt
      

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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42. Invertor gain is given by the ratio—
    

1. 1. DC o/p voltage

      AC I/P voltage

      
      

   
   
   

   2. AC o/p voltage

      AC I/P voltage

      
      

   
   
   

   3. DC o/p voltage

      DC I/P voltage

   
   
   

   4. AC o/p voltage

      DC I/P voltage

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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43. Which of the following statements are correct?
    1. BJT have + Ve temperature coefficient
    2. diodes are connected in series to increase the Blocking voltage capability
    3. The Input power factor of controllers which varies with delay angle is generally poor, especially at the low o/p range
    

1. 1. 1 and 2 only
      

   
   
   

   2. 2 and 3 only
      

   
   
   

   3. 1 and 3 only
      

   
   
   

   4. 1, 2 and 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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44. Which type of power supply is usually preferred for PC?
    

1. 1. Switched mode power supply
      

   
   
   

   2. Resonant power supply
      

   
   
   

   3. Bi-directional
      

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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45. In a power MOSFET, switching time are of the order of few—
    

1. 1. Seconds
      

   
   
   

   2. Milli seconds
      

   
   
   

   3. Micro second
      

   
   
   

   4. Nono seconds

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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