Q. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be

View solution

Q. Which of the following should dominant wave have?

View solution

Q. Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K

View solution

Q. The displacement flux density at a point on the surface of a perfect conductor is D = 2(ax - √3 az)c/m² pointing away from the surface. The charge density at that point c/m² will be

View solution

Q. Characteristic impedance of a transmission line is 50 Ω. Input impedance of the open circuited line. Zoc = 100 + J150 Ω. When transmission line is short circuited, then value of the input impedance will be

View solution

Q. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

View solution

Q. A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is

View solution

Q. In a conductor which of the following relations hold good?

View solution

Q. The radiation resistance of a λ/16 wire dipole in free space will be nearly

View solution

Q. The phase angle corresponding to λ/4 in a standing-wave pattern is

View solution

Q. A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.

View solution

Q. Calculate the directivity of an antenna for θE = 30°, θH = 60

View solution

Q. Which one of the following potential does not satisfy Laplace's equations?

View solution

Q. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.

View solution

Q. Calculate wave impedance for TE mode

View solution

Q. In a 100 turn coil, if the flux through each turn is (t³ - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is

View solution

Q. A (75 - j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

View solution

Q. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε0. The surface charge density on the conductor is ((ε0 = 10¯⁹/36π)F/m)

View solution

Q. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

View solution

Q. A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

View solution