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Radar Principles


Quiz Questions

1.The term Radar is an acronym made up of the words radio detection and ranging. The term is used to refer to electronic equipment that detects the presence, direction, height, and distance of objects by using reflected electromagnetic energy.
True
False
2. Modern radar systems are used for early detection of surface or air objects and provide extremely accurate information on distance, direction, height, and speed of the objects.
True
False
3.___________ measurement of range, or distance, is made possible because of the properties of radiated electromagnetic energy.
Radar
Energy
4.Range resolution is the ability of a radar system to distinguish between two or more targets on the same bearing but at different ranges.
True
False
5.The time between the beginning of one pulse and the start of the next pulse is called ___________.
Pulse-repetition frequency
Pulse-repetition time
6.What does figure 1-3 illustrate about?
(Refer Pg 1-6)
Radar pulse relationships
Second -Sweep Echoes
Pulse Repetition time
None of the above
7.Factor affecting radar range is antenna height. The high-frequency energy transmitted by a radar system travels in a straight line and does not normally bend to conform to the curvature of the earth.
True
False
8.The bearing angle to the radar target may also be measured in a clockwise direction from the centerline of your own ship or aircraft and is referred to as the True Bearing.
True
False
9.The frequency of the rf energy in the pulse radiated by radar is referred to as the ______________ of the radar system..
CARRIER FREQUENCY
RADIO FRAQUENCY
10.Radar accuracy is a measure of the ability of a radar system to determine the correct range, bearing, and, in some cases, height of an object.
True
False
11.Effect of atmosphere on radar performance is caused by particles suspended in the air. Water droplets and dust particles diffuse radar energy through absorption, reflection, and scattering so less energy strikes the target.
True
False
12.In mechanical scanning, the beam can be moved in various ways:
The entire antenna can be moved in the desired pattern
The energy feed source can be moved relative to a fixed reflector
The reflector can be moved relative to a fixed source
Any of the above 3 ways
13.Airborne radar is designed especially to meet the strict space and weight limitations that are necessary for all airborne equipment.
True
False
14.The maximum range of a pulse radar system depends on the following
Carrier frequency
Peak power
Pulse-repetition frequency
Receiver sensitivity
All of the above
15.The purpose of the magnet is to produce a fairly uniform magnetic field of the desired value over the interaction space between the cathode and plate of the magnetron.
True
False
16.The duplexer detects the very small target return echo and amplifies it to a usable level for display on the indicator.
True
False

17.The echo-box test results reflect the combined relative effectiveness of the transmitter as a transmitter of energy and the receiver as a receiver of energy.
True
False
18._______________ is defined as the frequency spread between the half-power points on the receiver response curve.
Receiver bandwidth
Recovery time
19.Many safety and health hazards are involved with operating and maintaining high-power radars. These hazards result from high levels of rf radiation, X-ray emissions, the necessity of working aloft, and the generation of extremely high voltages.
True
False
20.X rays can penetrate human tissue but they do not cause any damage of a temporary or permanent nature.
True
False