21. Mesh analysis is only applied to the planar circuits.
A. True
B. False
Answer: A
The mesh analysis is one of the network tools to find the responses in the circuits. It is only applicable to planar circuits. Planar circuits are 2-D circuits as mesh analysis involves mesh circulating currents.
22. All loops are meshes.
A. True
B. False
Answer: B
Loop is defined as a closed path that can contain small closed paths. Mesh does not contain any closed path. All meshes are loops but vice-versa is not true.
23. The nodal method is better than mesh analysis for solving circuit problems.
A. True
B. False
Answer: A
The nodal method is one of the best methods to solve any circuit problem. It is based on the KCL equation. It is applicable for planar and non-planar circuits. Mesh analysis cannot be applicable for non-planar circuits.
24. The minimum value of the admittance in the case of the parallel RLC network is ___________
A. R
B. 1÷R
C. Xl-Xc
D. Xc
Answer: B
The minimum value of the admittance in the case of the parallel RLC network is R. During resonance condition
Xl=Xc
so
Y = 1÷Z = (R2+(Xl-Xc)2).5 = 1÷R.
25. Calculate the value of the inductive reactance during resonance if the value of capacitive reactance is 2 ohm.
A. 8 Ω
B. 2 Ω
C. 3 Ω
D. 1 Ω
Answer: B
Resonance is defined as the phenomenon in which the energy of any element changes from one form to another.
During resonance condition Xl=Xc=2 Ω.
26. Calculate the quality factor for the resistor.
A. inf
B. 0
C. 1
D. .7
Answer: B
The quality factor is defined as the ratio of the reactive power to the active power consumed. The resistor always absorbs active power. The value of reactive power consumed is 0.
Quality factor=0/P=0.
27. Selectivity value increases for lower values of bandwidths.
A. True
B. False
Answer: A
Bandwidth is defined as the range of frequencies for which the signal exists. Selectivity is inversely proportional to the bandwidth. Lower the bandwidth lower will be the cost.
28. Calculate the equivalent resistance when two resistances are connected in parallel of values 2 Ω, and 2 Ω.
A. 1 Ω
B. 2 Ω
C. 4 Ω
D. 7 Ω
Answer: A
When two resistances are connected in parallel their equivalent resistance is equal to the harmonic mean of the individual resistances.
Req=R1.R2÷(R1+R2)=22 Ω.
29. Calculate the equivalent capacitance when two capacitors are connected in parallel of values 8 F, 7 F.
A. 15 F
B. 20 F
C. 40 F
D. 7 F
Answer: A
When two capacitances are connected in parallel their equivalent capacitance is equal to the sum of the individual capacitances.
