41. In the figure, switch S is closed at t = 0 with i_L (0) = 0 and V_C (0) = 0. In steady state V_C equals ______ .
    

1. 1. 0

   
   
   

   2. 1

   
   
   

   3. 2

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   At t = 0, i_L (0) = 0, V_C(0) = 0
   ∴ V_D = 100 V
   But at steady-state inductor is short circuited, therefore
   V_C = 100 – (+100) = 0 V
   

   Correct Option: A

   At t = 0, i_L (0) = 0, V_C(0) = 0
   ∴ V_D = 100 V
   But at steady-state inductor is short circuited, therefore
   V_C = 100 – (+100) = 0 V
   

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42. The average on-state current for an SCR is 20 A for a conduction angle of 120°. The average on state current for 60° conduction angle will be ______A .

1. 1. 10

   
   
   

   2. 20

   
   
   

   3. 30

   
   
   

   4. 40

   
   
   

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1. View Hint View Answer Discuss in Forum

   Iav =	Im
   	form factor

   
   where, form factor for 120° = 1.878 and form factor for 60° = 2.7781
   So, I_av is less than 20 A

   Correct Option: B

   Iav =	Im
   	form factor

   
   where, form factor for 120° = 1.878 and form factor for 60° = 2.7781
   So, I_av is less than 20 A

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43. In the figure, if C = 8 F and L = 0.2 mH and V₀ = 200V, then peak current through diode is given by ______ A.
    

1. 1. 40

   
   
   

   2. 80

   
   
   

   3. 150

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: A

   

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44. In the circuit shown in the figure, the switch is closed at time t = 0. The steady state value of the voltage V_c is ______V.
    
    

1. 1. 0

   
   
   

   2. 3

   
   
   

   3. 5

   
   
   

   4. 7

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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45. The circuit in the figure shows zener regulated dc power supply. The zener diode is ideal. The minimum value of RL down to which the output voltage remain constant, is ______ Ω .
    

1. 1. 15

   
   
   

   2. -45

   
   
   

   3. 45

   
   
   

   4. 90

   
   
   

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1. View Hint View Answer Discuss in Forum

   I =	24 - 15	=	1	A ; and VL = 15 V
   	27		3

   
   

   ∴ RL =	VL	=	15	= 45 Ω
   	I		1 / 3

   Correct Option: C

   I =	24 - 15	=	1	A ; and VL = 15 V
   	27		3

   
   

   ∴ RL =	VL	=	15	= 45 Ω
   	I		1 / 3

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