PYQs Based Test - 15 : Electromagnetics

The points P, Q, and R shown on the Smith chart (normalized impedance chart) in the following figure represent:

A coaxial cable is made of two brass conductors. The spacing between the conductors is filled with Teflon (ε’ᵣ= 2.1, tan δ = 0). Which one of the following circuits can represent the lumped element model of a small piece of this cable having length ∆z?

A lossy transmission line has resistance per unit length R = 0.05 Ω/m. The line is distortionless and has a characteristic impedance of 50 Ω. The attenuation constant (in Np/m, correct to three decimal places) of the line is _________.

In a source free region in vacuum, if the electrostatic potential, $\varphi =2{\mathrm{x}}^2+{\mathrm{y}}^2+\mathrm{c}{\mathrm{z}}^2$, the value of constant c must be____________.

Light from free space is incident at an angle θ₁to the normal of the facet of a step-index large core optical fibre. The core and cladding refractive indices are n₁ = 1.5 and n₂ = 1.4, respectively.



The maximum value of θ₁(in degrees) for which the incident light will be guided in the core of the fibre is ________.