Test: Electromagnetic Field Theory - 4 - Electronics and Communication Engineering (ECE) MCQ

The shunt admittance of a transmission line is given by

A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is

Electric lines of force do not cross each other because

A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?

For free space propagation

SHF range is

For an ideal antenna, numerical value of directivity must be

The force in a magnetic field is given by F = qvB

An electromagnetic wave is incident normally on a dielectric boundary. It is

According to maximum power transfer theorem, if the load is inductive, the source should be

According to Siegel and Labus, antenna can be treated as

The value of susceptibility in case of vacuum is taken as

Given figure shows a 90º sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region

Self impedance is

Equipotential surfaces about a point charge are in which one of the following forms?

__________ will have the least value of relative permeability.

The relative permeability is taken as unity for which of the following?

The disturbance from adjacent power lines is known as

Which of the following term applies to troposcatter propagation?

Magnesium is alloyed with conducting materials for antenna primarily with the purpose of

Two co-axial cylindrical sheets of charge are present in free space f_s = 5 c/m² at r = 2 m and r_s = -2 c/m² at r = 4 m, The displacement flux density at r = 3 m is