101. Thermal resistance in SCRs has the units of…… (W/°C, or ohms or °C/W) and heat sinks are made from …… (copper/steel/aluminium)
     
     

1. 1. °C/W, Aluminium

   
   
   

   2. °C/W, Copper

   
   
   

   3. W/°C, Aluminium

   
   
   

   4. W/°C, Copper

   
   
   

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   NA

   Correct Option: A

   NA

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102. 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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103. 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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104. 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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105. For an SCR, dv/dt protection is achieved through the use of—
     
     

1. 1. RL in series with SCR

   
   
   

   2. RC across SCR

   
   
   

   3. L in series with SCR

   
   
   

   4. RC in series with SCR

   
   
   

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   NA

   Correct Option: B

   NA

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