PYQs Based Test - 16 : Electromagnetics

Consider an air-filled rectangular waveguide with a cross-section of 5 cm × 3 cm. For this waveguide, the cut-off frequency (in MHz) of TE₂₁ mode is _________.

A vector P is given by $\vec{\mathrm{P}}={\mathrm{x}}^3\mathrm{y}{\vec{\mathrm{a}}}_{\mathrm{x}}-{\mathrm{x}}^2{\mathrm{y}}^2{\vec{\mathrm{a}}}_{\mathrm{y}}-{\mathrm{x}}^2\mathrm{yz}{\vec{\mathrm{a}}}_{\mathrm{z}}$ . Which one of the following statements is TRUE?

Two rectangular waveguides have dimensions of 1 cm × 0.5 cm and 1 cm × 0.25 cm respectively. Their respective cutoff frequencies will be

An antenna with 95% efficiency has maximum radiation intensity of 0.5 W/sr. The directivity of the antenna when input power is 0.4 w is ________ dB.

Consider a standard rectangular and a circular waveguide having same dominant mode cut-off frequency, determine the ratio of area of circular waveguide to rectangular waveguide: