Test: Electromagnetic Field Theory - 5 - Electronics and Communication Engineering (ECE) MCQ

The electric flux and field intensity inside a conducting sphere is

T.V. antennas are usually

Measurement of radiation resistance by reflection method is suitable for

A lossless transmission line is connected to two identical voltage source as shown in figure.

The impedance measured at the midpoint AA' is

A loss less transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is

A higher directivity is specified by

The best excited reflector from a wave guide is

Long distance short-wave radio broadcasting uses

The affect of ground on radiation pattern is to

If a electromagnetic signal is incident at 0º in a waveguide then at other port of waveguide we will get

An antenna having a high Q has

The polarization of dielectric materials results in

For a quarter wave transformer, characteristic impedance is related with input and load impedances as

An electron when placed midway between two equal and opposite charges will

Which of the following is the abnormal phenomena observed in the ionosphere?

In a loss-less transmission line

Which layer is least important in high frequency propagation?

Which of the wave remains unaffected whether it is a day or night?

Which of the following is not an omnidirectional antenna?

The unit of magnetic flux density is

In a waveguide if TE mode exist for z direction propagation, then

Critical frequency of a layer in ionosphere