36. The base-biased transistor circuit of figure is subjected to increase in junction temperature from 25°C to 75°. If β increases from 100 to 150 with rising temperature, percentage change in a-point value (I_C, V_CE) over the temperature range will be (assume V_BE reacts at 0.7 V)
    
    

1. 1. – 40%

   
   
   

   2. – 44.57%

   
   
   

   3. – 46.57%

   
   
   

   4. – 48.0%

   
   
   

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1. View Hint View Answer Discuss in Forum

   IB =	VCC - VBE	=	12 - 0.7	= 0.113 mA
   	RB		100 × 103

   
   I_C = β I_B = 100 × 0.113 = 11.3 mA
   V_CE = V_CC - I_C R_C
   = 12 – (11.3 × 10^–3 × 500) = 5.35 V
   At 75° C I_B = 0.113 mA
   I_C = β I_B = 150 × 0.113 = 16.95 mA
   V_CE = 12 – (16.95 × 10^–3 × 500) = 3.32 V
   

   ∴ ∆IC =	16.75 - 1.3	× 100 = 50% (increased)
   	11.3

   
   

   and ∆ VCE =	3.52 - 6.35	× 100 = -44.57% (decreased)
   	11.3

   Correct Option: B

   IB =	VCC - VBE	=	12 - 0.7	= 0.113 mA
   	RB		100 × 103

   
   I_C = β I_B = 100 × 0.113 = 11.3 mA
   V_CE = V_CC - I_C R_C
   = 12 – (11.3 × 10^–3 × 500) = 5.35 V
   At 75° C I_B = 0.113 mA
   I_C = β I_B = 150 × 0.113 = 16.95 mA
   V_CE = 12 – (16.95 × 10^–3 × 500) = 3.32 V
   

   ∴ ∆IC =	16.75 - 1.3	× 100 = 50% (increased)
   	11.3

   
   

   and ∆ VCE =	3.52 - 6.35	× 100 = -44.57% (decreased)
   	11.3

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37. In the transistor circuit shown below, the collector to ground voltage is + 20 V.
    
    The possible condition is
    

1. 1. collector-emitter terminals shorted

   
   
   

   2. emitter to ground connection open

   
   
   

   3. 10 kilo-ohms resistor open

   
   
   

   4. collector-base terminals shorted

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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38. The gain bandwidth product of a two stage CE amplifier is
    

1. 1. same as that of one stage

   
   
   

   2. greater than that of one stage

   
   
   

   3. less than that of one stage

   
   
   

   4. product of the two gain bandwidth products of each stage

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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39. In the following two non-linear transistor biasing circuits, the resistors
    
    

1. 1. R_A and R_B, both have negative temperature coefficient.

   
   
   

   2. R_A and R_B, both have positive temperature coefficient.

   
   
   

   3. R_A has negative temperature coefficient and R_B has positive temperature coefficient.

   
   
   

   4. R_A has positive temperature coefficient and R_B has negative temperature coefficient.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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40. For the given input, output waveform across the diode shown in the figure will be
    
    

1. 1. 
      

   
   
   

   2. 
      

   
   
   

   3. 
      

   
   
   

   4. 

   
   
   

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1. View Hint View Answer Discuss in Forum

   The diode will not conduct in the negative half of the wave and while it conducts, there will be a small voltage drop across it, shown as 0.06 V on (d)

   Correct Option: D

   The diode will not conduct in the negative half of the wave and while it conducts, there will be a small voltage drop across it, shown as 0.06 V on (d)

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