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1. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: c [Reason:] When diode D is forward biased it conducts current and hence voltage drop across is VD. For positive half cycle of the input diode conducts and Vout becomes VD. The linear portion of the graph is the point where Vin is positive is because up to 0.7V diode will not conduct and input as such appears on output. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k). The minimum voltage across it will be -5/2 = -2.5V and maximum voltage at output is 0.7V In the diagram, red shows input and green shows output .

2. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: c [Reason:] When diode D is forward biased it conducts current and hence voltage drop across is VD. For positive half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k). The minimum voltage across it will be -5/2 = -2.5V and maximum voltage at output is 0.7V.

3. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: d [Reason:] When diode D is forward biased it conducts current and hence voltage drop across is VD. For negative half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k). The maximum voltage across it will be 5/2 = 2.5V and minimum voltage at output is -0.7V In the diagram, red shows input and green shows output.

4. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: d [Reason:] When diode D is forward biased it conducts current and hence voltage drop across is VD. For negative half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k). The maximum voltage across it will be 5/2 = 2.5V and minimum voltage at output is -0.7V.

5. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a) 5v
b) 2v
c) 0V
d) 10v

Answer: c [Reason:] In circuit of parallel clipper voltage across the diode D2 will be same as a simple parallel clipper. The output of the circuit is null because the output of diode D2 is negative and diode D will not conduct negative voltage.

6. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: a [Reason:] Answer is first graph, because the diode D2 gives negative output and this can be obtained through the diode D. Sine it passes through diode D it will have a voltage drop of VD.

7. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: b [Reason:] Here in the circuit since both diodes are in opposite direction both positive and negative cycles will pass through diodes. Since both diodes conduct every time the voltage across diodes will always be 0.7V and sign depends on the cycle.

8. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)

Answer: d [Reason:] Here in the circuit since both diodes are in opposite direction both positive and negative cycles will pass through diodes. Since both diodes conduct every time the voltage across diodes will always be 0.7V and sign depends on the cycle.

9. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)

a)
b)
c)
d)