Analog Electronic Circuits

Parallel and Series Configuration

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current through the silicon diode?
9.3 mA
9.7 mA
10 mA
0 mA
Explanation:
The source voltage initially increases from 0-10 V. As the source voltage increases, the voltage across the diodes also increases. When the voltage across the diodes reaches a value of 0.3 V, the Germanium diode starts conducting, whereas the silicon diode is still in the off state. Hence, the voltage across silicon diode = 0.3 V and hence, the current according to the approximate equivalent circuit model is equal to zero.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the current through the parallel resistor?
9.3 mA
0.7 mA
8.6 mA
0 mA
Explanation:
As the resistor is in parallel with the diodes, the voltage that appears across it is 0.7 V. Hence, current = 0.7 mA.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current through the germanium diode?
9.4 mA
9.7 mA
0.3 mA
0 mA
Explanation:
Current through R2 = 9.7 mA. Also, current through R = 0.3 mA, current through the silicon diode = 0 mA. Hence, from the KCL, we get the current through the germanium diode to be 9.4 mA.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current flowing through the diode D2?
0 mA
10 mA
9.3 mA
8.6 mA
Explanation:
As the diode D2 is reverse biased, the current flowing through it = 0 mA.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current through R2?
9.3 mA
9.7 mA
10 mA
0 mA
Explanation:
Here, the voltage across R=0.3 V, hence, current through R2 = (10-0.3) V/ 1 k = 9.7 mA.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
From the given circuit, what is the value of current flowing through the 1 k resistor parallel to the diodes?
10 mA
9.3 mA
8.6 mA
0 mA
Explanation:
As both the diodes are reverse biased. Voltage drop across the resistor = 10 V. Hence, current = 10 V/1 k = 10 mA.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of the current through the series resistor R2?
9.3 mA
10 mA
0 mA
8.6 mA
Explanation:
The voltage across the diodes is 0.7 V as they are forward biased. Hence, the current through the series resistor = (10-0.7)/1k = 9.3 mA.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current through R?
0.7 mA
0.3 mA
1 mA
10 mA
Explanation:
The source voltage initially increases from 0-10 V. As the source voltage increases, the voltage across the diodes also increases. When the voltage across the diodes reaches a value of 0.3 V, the Germanium diode starts conducting, whereas the silicon diode is still in the off state. Hence, the voltage across R = 0.3 V. Hence, current = 0.3 mA.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
From the given circuit, what is the value of current flowing through the 1 k resistor?
0 mA
10 mA
9.3 mA
0.7 mA
Explanation:
As one of the diodes is forward biased, voltage drop across it = 0.7 V. Now, as this diode is in parallel with the given resistor, voltage across resistor = 0.7 V => current = 0.7 mA.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In the given circuit, what is the value of current flowing through the forward biased diode?
10 mA
9.3 mA
8.6 mA
0 mA
Explanation:
Here, current flowing through R2 = (10-0.7)/1k = 9.3 mA. Also the current through the parallel resistor=0.7 mA. Hence the current through the forward biased diode = (9.3-0.7) = 8.6 mA.