Q. Which of the following statement is incorrect?

View solution

Q. Which of the following will increase the antenna radiation efficiency?

View solution

Q. A waveguide operated below cut off frequency can be used as

View solution

Q. A time varying field is applied to a circuit with a capacitor- which of the following statements is correct?

View solution

Q. The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

View solution

Q. The transmitting antennas for lower frequencies (below 500 kHz) are generally

View solution

Q. In an home T.V. receiver, the leed in from the antenna is

View solution

Q. A satellite that simply reflect back the signals from one region of the earth to the other region is known as

View solution

Q. Conductivity is measured in terms of

View solution

Q. It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be

View solution

Q. Which of the following statement is false?

View solution

Q. The useful magnetic flux obtainable from any closed surface is

View solution

Q. The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.

View solution

Q. The equation ∇ . J = 0 is called

View solution

Q. The capacitance between two spheres, whose separation is very much larger than their radii R, is given approximately as

View solution

Q. If ωε is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect?

View solution

Q. Parabolic and lens antenna used at

View solution

Q. Which of the following statement regarding waveguides is incorrect?

View solution

Q. The potential that appears at a point in space due to the current which caused it is called potential

View solution

Q. It is best to use for coupling a coaxial line to a parallel wire transmission line.

View solution