This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Series-Parallel Interconnection of Two Port Network”.

1. Consider an RL series circuit having resistance R = 3 Ω, inductance L = 3 H and is excited by 6V. The current after a long time after closing of switch is ____________

a) 1 A

b) 2 A

c) 0 A

d) Infinity

2. The energy stored in a coil is 108 J. The power dissipated instantaneously across the blades of switch after it is opened in 10 ms is ____________

a) 108 W

b) 1080 W

c) 10800 W

d) 108000 W

3. If the diameter of a wire is doubled, the current carrying capacity of the wire is ___________

a) Half

b) Twice

c) Four times

d) One-fourth

4. A parallel RLC circuit with R_{1} = 20, L_{1} = 1100 and C_{1} = 1200 is scaled giving R_{2} = 10^{4}, L_{2} = 10^{-4} and C_{2}, the value of C_{2} is ___________

a) 0.10 nF

b) 0.3 nF

c) 0.2 nF

d) 0.4 nF

5. The Thevenin’s equivalent of a network is a 10 V source in series with 2 Ω resistances. If a 3 Ω resistance is connected across the Thevenin’s equivalent is _____________

a) 10 V in series with 1.2 Ω resistance

b) 6 V in series with 1.2 Ω resistance

c) 10 V in series with 5 Ω resistance

d) 6 V in series with 5 Ω resistance

6. Two coils X and Y have self-inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is ____________

a) 0.3 V

b) 0.5 V

c) 1 V

d) 1.5 V

7. Barletts Bisection Theorem is applicable to ___________

a) Unsymmetrical networks

b) Symmetrical networks

c) Both unsymmetrical and symmetrical networks

d) Neither to unsymmetrical nor to symmetrical networks

8. A magnetic circuit has an iron length of 100 cm and air gap length 10 cm. If μ_{r} = 200 then which of the following is true?

a) Mmf for iron and air gap are equal

b) Mmf for iron is much less than that for air gap

c) Mmf for iron is much more than that for air gap

d) Mmf for iron and air gap are not equal

9. A 50 Hz current has an amplitude of 25 A. The rate of change of current at t = 0.005 after i = 0 and is increasing is ____________

a) 2221.44 A/s

b) 0

c) -2221.44 A/s

d) -3141.6 A/s

10. Consider a circuit having resistances 16 Ω and 30 Ωis excited by a voltage V. A variable resistance R is connected across the 16 Ω resistance. The power dissipated in 30 Ω resistance will be maximum when value of R is __________

a) 30 Ω

b) 16 Ω

c) 9 Ω

d) 0

11. Given two voltages, 50 ∠0 V and 75 ∠- 60° V. The sum of these voltages is ___________

a) 109 ∠- 60° V

b) 109 ∠- 25° V

c) 109 ∠- 36.6° V

d) 100 ∠- 50.1° V

12. Consider a series RL circuit in which current 12 A is flowing through R and current 16 A is flowing through L. The current supplied by the sinusoidal current source I is ____________

a) 28 A

b) 4 A

c) 20 A

d) Cannot be determined

13. Consider a cube having resistance R on each of its sides. For this non-planar graph, the number of independent loop equations are _______________

a) 8

b) 12

c) 7

d) 5

14. For the circuit given below, the value of z_{21} parameter is ____________

a) z_{21} = 0.0667 Ω

b) z_{21} = 2.773 Ω

c) z_{21} = 1.667 Ω

d) z_{21} = 0.999 Ω

15. For the circuit given below, the value of z_{11} parameter is ____________

a) z_{11} = 1.775 + j5.739 Ω

b) z_{11} = 1.775 – j4.26 Ω

c) z_{11} = -1.775 – j4.26 Ω

d) z_{11} = 1.775 + j4.26 Ω