96. An UJT exhibits negative resistance region—

1. 1. before the peak point

   
   
   

   2. between peak and valley points

   
   
   

   3. after the valley point

   
   
   

   4. both (a) and (c)

   
   
   

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   NA

   Correct Option: B

   NA

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97. In an UJT, with VBB as the voltage across two base terminals, the emitter potential at peak point is given by—
    

1. 1. _ηV_BB

   
   
   

   2. _ηV_D

   
   
   

   3. _ηV_BB + V_D

   
   
   

   4. _ηV_D + V_BB

   
   
   

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   NA

   Correct Option: C

   NA

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98. For dynamic equalizing circuit used for series connected SCRs, the choice of C is based on—

1. 1. reverse recovery characteristic

   
   
   

   2. turn-on characteristics

   
   
   

   3. turn-off characteristics

   
   
   

   4. rise-time characteristics

   
   
   

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   NA

   Correct Option: A

   NA

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99. For series connected SCRs, dynamic equalizing circuit consists of—

1. 1. resistor R and capacitor C in series but with a diode D across C

   
   
   

   2. series R and D circuit but with across R

   
   
   

   3. series R and C circuit but with D across R

   
   
   

   4. series C and D circuit but with R across C

   
   
   

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   NA

   Correct Option: C

   NA

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100. Practical way of obtaining static voltage equalization in series-connected SCRs is by the use of—

1. 1. one resistor across the string

   
   
   

   2. resistors of different value across each SCR

   
   
   

   3. resistors of the same value across each SCR

   
   
   

   4. one resistor in series with the string

   
   
   

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   NA

   Correct Option: C

   NA

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