Radar Engineering and Satellite Communication MCQs

Question 1

The resolution of a radar is its ability to

Accepted Answer

distinguish between two closelyspaced targets

Answer

detect target in rain and fog

Answer

detect only moving targets

Answer

detect several targets at a time

Question 2

If 1 watt of R.F. power is fed to a directional coupler having 20 dB coupling, the power available at the coupled port is watts.

Accepted Answer

100

Answer

1

Answer

?10

Answer

none of the above

Question 3

A circularly-polarized wave is a

Accepted Answer

superposition of two linearlypolarizedwaves of equal amplitude which are orthogonal in space and 90? out of phase

Answer

superposition of two sine waves

Answer

superposition of two linearly-polarized waves of equal amplitude which are orthogonal in space and 180? out of phase

Answer

superposition of one sine wave and a cosine wave

Question 4

Radar detection is limited to line-of-sight because

Accepted Answer

curvature of the Earth

Answer

ionosphere

Answer

long wavelengths are used

Answer

none of above

Question 5

The maximum range R of detection of target is proportional to ? of the transmitted power.

Accepted Answer

fourth root

Answer

square root

Answer

square

Answer

one-fourth

Question 6

A radar used for measuring the height of an aircraft is known as

Accepted Answer

radar altimeter

Answer

radar elevator

Answer

radar speedometer

Answer

radar latitude

Question 7

VOR stands for

Accepted Answer

VHF Omni range

Answer

visually operated radar

Answer

voltage output of regulator

Answer

none of the above

Question 8

The `COHO' in MTI radar operates at the

Accepted Answer

intermediate frequency

Answer

received frequency

Answer

pulse repetition frequency

Answer

transmitted frequency

Question 9

Radar transmits pulsed electromagnetic energy because

Accepted Answer

it provides a very ready measurement of range

Answer

it is easy to mearure the direction of the target

Answer

it is very easy to identify the targets

Answer

none of above