Analog Electronic Circuits Questions and Answers – Parallel and Series Configuration

This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Parallel and Series Configuration”.

1. From the given circuit, what is the value of current flowing through the 1 k resistor parallel to the diodes?
Find the value of current flowing through the 1 k resistor parallel to the diodes
a) 10 mA
b) 9.3 mA
c) 8.6 mA
d) 0 mA
View Answer

Answer: a
Explanation: As both the diodes are reverse biased. Voltage drop across the resistor = 10 V. Hence, current = 10 V/1 k = 10 mA.

2. From the given circuit, what is the value of current flowing through the 1 k resistor?
Find the value of current flowing through the 1 k resistor with voltage drop is 0.7 V
a) 0 mA
b) 10 mA
c) 9.3 mA
d) 0.7 mA
View Answer

Answer: d
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.

3. In the given circuit, what is the value of current flowing through the forward biased diode?
Circuit with current flowing through R2 & parallel resistor
a) 10 mA
b) 9.3 mA
c) 8.6 mA
d) 0 mA
View Answer

Answer: c
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.
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4. In the given circuit, what is the value of current flowing through the diode D2?
Find the value of current flowing through the reverse biased diode D2
a) 0 mA
b) 10 mA
c) 9.3 mA
d) 8.6 mA
View Answer

Answer: a
Explanation: As the diode D2 is reverse biased, the current flowing through it = 0 mA.

5. In the given circuit, what is the value of the current through the series resistor R2?
Find the value of the current through the series resistor R2
a) 9.3 mA
b) 10 mA
c) 0 mA
d) 8.6 mA
View Answer

Answer: a
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.
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6. In the given circuit, what is the current through the parallel resistor?
Find the current through the parallel resistor with voltage appears across is 0.7 V
a) 9.3 mA
b) 0.7 mA
c) 8.6 mA
d) 0 mA
View Answer

Answer: b
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.

7. In the given circuit, what is the value of current through R?
Find the value of current through R with initial source voltage from 0-10 V
a) 0.7 mA
b) 0.3 mA
c) 1 mA
d) 10 mA
View Answer

Answer: b
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.
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8. In the given circuit, what is the value of current through R2?
Find the value of current through R2 with voltage across R is 0.3 V
a) 9.3 mA
b) 9.7 mA
c) 10 mA
d) 0 mA
View Answer

Answer: b
Explanation: Here, the voltage across R=0.3 V, hence, current through R2 = (10-0.3) V/ 1 k = 9.7 mA.

9. In the given circuit, what is the value of current through the silicon diode?
Find the value of current through the silicon diode voltage across diodes is 0.3 V
a) 9.3 mA
b) 9.7 mA
c) 10 mA
d) 0 mA
View Answer

Answer: d
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.
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10. In the given circuit, what is the value of current through the germanium diode?
Determine the value of current through the germanium diode from KCL
a) 9.4 mA
b) 9.7 mA
c) 0.3 mA
d) 0 mA
View Answer

Answer: a
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.

11. In the given circuit, by what amount does the current across R change when the Germanium diode is reconnected in the reverse-bias mode?
Find current change across R when Germanium diode is reconnected in reverse-bias mode
a) 0 mA
b) 0.7 mA
c) 0.4 mA
d) 0.3 mA
View Answer

Answer: c
Explanation: When the germanium diode is forward biased, current through R = 0.3 mA. When the Germanium diode is reverse biased, current through R = 0.7 mA. Hence, change in current = 0.4 mA.

12. In the given circuit, if the diode D2 is a Germanium diode and all other diodes are Silicon diodes, then which of the following statements is true?
Circuit diagram with voltage across the parallel diodes is 0.3 V & current through D3 0
a) ID2 < ID3; ID2 = ID1
b) ID2 > ID3; ID2 > ID1
c) ID2 > ID3; ID2 = ID1
d) ID2 > ID3; ID2 < ID1
View Answer

Answer: c
Explanation: Voltage across the parallel diodes = 0.3 V. Hence, current through D3 = 0. Hence ID2 > ID3. Also, as both the parallel silicon diodes are in parallel and in off-state, the diodes 1 and 2 are in series and hence, current through them is same.

13. In the circuit, considering the diode 1,4 to be a Germanium diode and the diodes 2,3 to be silicon, which of the following statements are true?
Circuit diagram diodes 1 & 4 in series & the current through diodes 1 & 4 is same
a) ID1 = ID2
b) ID1 = ID3
c) ID1 = ID4
d) ID1 > ID4
View Answer

Answer: c
Explanation: In the given circuit, the silicon diodes are in off-state as the voltage across them is 0.3 V. Hence, they act as open circuit and the diodes 1 and 4 are in series and hence the current through diodes 1 and 4 is same.

Sanfoundry Global Education & Learning Series – Analog Circuits.

To practice all areas of Analog Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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