Objective Questions on Circuit Theory | Page – 2

1. The voltage across the 1 kΩ resistor between the nodes A and B of the network shown in the given figure is

Under construction.

2. In the network shown, what is the current I in the direction shown?

Under construction.

3. An electrical circuit with 10 branches and 7 nodes will have

Number of loop equations = branches – nodes + 1 = b – n + 1 = 10 – 7 + 1 = 4 loop equations.

4. In given figure, the value of resistance R in Ω is

The given circuit can be simplified by replacing voltage source by equivalent current source as below,

The current through 5 Ω resistor is 8 A hence voltage across it is 8 × 5 = 40 V and this is the voltage across unknown resistor R. As current through R is 2 A.

5. In given figure, the value of resistance R in Ω is

The given circuit can be simplified by replacing voltage source by equivalent current source as below,

6. A 35 V source is connected to a series circuit of 600 Ω and R as shown. If a voltmeter of internal resistance 1.2 kΩ is connected across 600 Ω resistor, it reads 5 V. The value of R is

As the voltmeter of internal resistance 1.2 kΩ is connected across the 600 Ω resistor and it gives 5 V reading.

As supply voltage is 35 V, the voltage across resistor R is 35 – 5 = 30 V.

7. A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is

Under construction.

8. In the circuit given, I = 1 A for Is = 0. What is the value of I for Is = 2 A ?

Under construction.

9. In the circuit shown below, what is the voltage across 5 Ω resistor ?

Under construction.

10. For the circuit shown in the given figure the current I is given by

Under construction.

11. For the circuit given in the figure the power delivered by the 2 V source is given by

Under construction.

12. In the circuit shown in the figure, the value of Vs is 0, when I = 4 A. The value of I, when Vs = 16 V, is

Under construction.

13. Consider the following circuit. In this circuit, when Vs = 3 V, I = 4 A, what is the value of I when Vs = 12 V?

Under construction.

14. In the figure given, the value of R is

Under construction.

15. In the given figure the value of the source voltage is

Under construction.

16. Three resistance of two ohms each are connected in star in the equivalent delta representation each resistance will have a value of _______________ Ω.

17. Consider the following circuit. What is the value of current I in the 5 Ω resistor in the circuit given in the figure?

Under construction.

18. The value of V in the circuit shown in the given figure is

Under construction.

19. In the given figure, the Thevenin’s equivalent voltage and impedance as seen from the terminals P – Q is given by

Hence the Thevenin’s equivalent voltage is 2 V and impedance is 5 Ω.

20. For the network shown below when I = 0, V = 20 V and when R = 0, I = 10 A. If now R = 3 Ω what is the value of the current I?

Under construction.